{"id":1928,"date":"2026-02-25T11:55:10","date_gmt":"2026-02-25T11:55:10","guid":{"rendered":"https:\/\/www.voltage-tester.com\/insulation-resistance-test-guide-article\/"},"modified":"2026-02-25T11:55:12","modified_gmt":"2026-02-25T11:55:12","slug":"insulation-resistance-test-guide","status":"publish","type":"post","link":"https:\/\/www.voltage-tester.com\/vi\/insulation-resistance-test-guide-article\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn chuy\u00ean s\u00e2u 7 b\u01b0\u1edbc: C\u00e1ch th\u1ef1c hi\u1ec7n ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n \u0111\u00fang c\u00e1ch"},"content":{"rendered":"<h2 id=\"abstract\">T\u00f3m t\u1eaft<\/h2>\n<p>Th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p \u0111\u00e1nh gi\u00e1 kh\u00f4ng ph\u00e1 h\u1ee7y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o m\u1ee9c \u0111\u1ed9 c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n \u0111i qua l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n. \u0110\u00e1nh gi\u00e1 n\u00e0y c\u00f3 vai tr\u00f2 c\u01a1 b\u1ea3n trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u1eadn h\u00e0nh v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng nh\u01b0 \u0111\u1ed9ng c\u01a1, m\u00e1y bi\u1ebfn \u00e1p v\u00e0 c\u00e1p \u0111i\u1ec7n. Quy tr\u00ecnh n\u00e0y bao g\u1ed3m vi\u1ec7c \u00e1p d\u1ee5ng m\u1ed9t \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u \u1ed5n \u0111\u1ecbnh v\u00e0 cao v\u00e0o thi\u1ebft b\u1ecb, sau \u0111\u00f3 \u0111o d\u00f2ng r\u00f2 ph\u00e1t sinh, t\u1eeb \u0111\u00f3 t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u1edf b\u1eb1ng \u0111\u01a1n v\u1ecb megohm. Gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n th\u1ea5p cho th\u1ea5y c\u00e1c \u0111\u01b0\u1eddng d\u1eabn ti\u1ec1m \u1ea9n cho d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn h\u1ecfng h\u00f3c thi\u1ebft b\u1ecb, ch\u1eadp \u0111i\u1ec7n ho\u1eb7c nguy c\u01a1 gi\u1eadt \u0111i\u1ec7n. C\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 nhi\u1ec7t \u0111\u1ed9, \u0111\u1ed9 \u1ea9m v\u00e0 \u00f4 nhi\u1ec5m b\u1ec1 m\u1eb7t \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn c\u00e1c ph\u00e9p \u0111o, do \u0111\u00f3 c\u1ea7n c\u00f3 c\u00e1c quy tr\u00ecnh ti\u00eau chu\u1ea9n h\u00f3a v\u00e0 c\u00e1c h\u1ec7 s\u1ed1 hi\u1ec7u ch\u1ec9nh \u0111\u1ec3 gi\u1ea3i th\u00edch ch\u00ednh x\u00e1c. B\u00e0i ki\u1ec3m tra n\u00e0y tr\u00ecnh b\u00e0y chi ti\u1ebft c\u00e1c c\u01a1 s\u1edf l\u00fd thuy\u1ebft, c\u00e1c b\u01b0\u1edbc th\u1ee7 t\u1ee5c v\u00e0 c\u00e1ch gi\u1ea3i th\u00edch k\u1ebft qu\u1ea3 \u0111\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n h\u1ee3p l\u1ec7, t\u1ea1o th\u00e0nh n\u1ec1n t\u1ea3ng cho c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh b\u1ea3o tr\u00ec d\u1ef1 \u0111o\u00e1n nh\u1eb1m ng\u0103n ch\u1eb7n c\u00e1c s\u1ef1 c\u1ed1 th\u1ea3m kh\u1ed1c v\u00e0 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a c\u00e1c t\u00e0i s\u1ea3n \u0111i\u1ec7n quan tr\u1ecdng.<\/p>\n<h2 id=\"key-takeaways\">Nh\u1eefng \u0111i\u1ec3m ch\u00ednh<\/h2>\n<ul>\n<li>Tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh ki\u1ec3m tra, lu\u00f4n ph\u1ea3i ng\u1eaft ngu\u1ed3n \u0111i\u1ec7n v\u00e0 c\u00e1ch ly thi\u1ebft b\u1ecb b\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 \u0111\u00fang c\u00e1c quy tr\u00ecnh kh\u00f3a\/d\u00e1n nh\u00e3n.<\/li>\n<li>L\u00e0m s\u1ea1ch b\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t v\u00e0 t\u00ednh \u0111\u1ebfn y\u1ebfu t\u1ed1 nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ea9m \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o k\u1ebft qu\u1ea3 \u0111o ch\u00ednh x\u00e1c.<\/li>\n<li>Ch\u1ecdn \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m ph\u00f9 h\u1ee3p d\u1ef1a tr\u00ean th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ghi tr\u00ean nh\u00e3n hi\u1ec7u c\u1ee7a thi\u1ebft b\u1ecb \u0111\u1ec3 tr\u00e1nh h\u01b0 h\u1ecfng.<\/li>\n<li>S\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra Ch\u1ec9 s\u1ed1 C\u1ef1c h\u00f3a (PI) \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 to\u00e0n di\u1ec7n t\u00ecnh tr\u1ea1ng c\u00e1ch \u0111i\u1ec7n theo th\u1eddi gian.<\/li>\n<li>M\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ec1u \u0111\u1eb7n l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng \u0111\u1ec3 th\u1ef1c hi\u1ec7n b\u1ea3o tr\u00ec d\u1ef1 \u0111o\u00e1n hi\u1ec7u qu\u1ea3.<\/li>\n<li>D\u1eef li\u1ec7u l\u1ecbch s\u1eed v\u1ec1 xu h\u01b0\u1edbng, b\u1edfi v\u00ec s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u1ee9c kh\u00e1ng c\u1ef1 theo th\u1eddi gian mang t\u00ednh ch\u1ea5t ph\u1ea3n \u00e1nh r\u00f5 r\u00e0ng h\u01a1n so v\u1edbi m\u1ed9t gi\u00e1 tr\u1ecb \u0111\u01a1n l\u1ebb.<\/li>\n<li>C\u1ea7n l\u01b0u \u00fd r\u1eb1ng c\u00e1c ch\u1ec9 s\u1ed1 th\u1ea5p cho th\u1ea5y c\u00f3 \u0111\u1ed9 \u1ea9m, \u00f4 nhi\u1ec5m ho\u1eb7c s\u1ef1 xu\u1ed1ng c\u1ea5p c\u1ea7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd.<\/li>\n<\/ul>\n<h2 id=\"table-of-contents\">M\u1ee5c l\u1ee5c<\/h2>\n<ul>\n<li><a href=\"#understanding-the-core-principles-of-insulation-resistance\">Hi\u1ec3u r\u00f5 c\u00e1c nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n v\u1ec1 \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n<\/a><\/li>\n<li><a href=\"#step-1-the-primacy-of-safety-de-energization-and-isolation\">B\u01b0\u1edbc 1: An to\u00e0n l\u00e0 tr\u00ean h\u1ebft \u2013 Ng\u1eaft ngu\u1ed3n v\u00e0 c\u00e1ch ly<\/a><\/li>\n<li><a href=\"#step-2-preparing-the-test-subject-and-environment\">B\u01b0\u1edbc 2: Chu\u1ea9n b\u1ecb \u0111\u1ed1i t\u01b0\u1ee3ng th\u1eed nghi\u1ec7m v\u00e0 m\u00f4i tr\u01b0\u1eddng<\/a><\/li>\n<li><a href=\"#step-3-selecting-the-appropriate-test-voltage\">B\u01b0\u1edbc 3: Ch\u1ecdn \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m ph\u00f9 h\u1ee3p<\/a><\/li>\n<li><a href=\"#step-4-mastering-the-connections-the-role-of-test-leads\">B\u01b0\u1edbc 4: N\u1eafm v\u1eefng c\u00e1c k\u1ebft n\u1ed1i \u2013 Vai tr\u00f2 c\u1ee7a d\u00e2y d\u1eabn th\u1eed nghi\u1ec7m<\/a><\/li>\n<li><a href=\"#step-5-executing-the-insulation-resistance-test-protocols\">B\u01b0\u1edbc 5: Th\u1ef1c hi\u1ec7n c\u00e1c quy tr\u00ecnh ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n<\/a><\/li>\n<li><a href=\"#step-6-the-art-of-interpretation-from-raw-data-to-actionable-insights\">B\u01b0\u1edbc 6: Ngh\u1ec7 thu\u1eadt ph\u00e2n t\u00edch \u2013 T\u1eeb d\u1eef li\u1ec7u th\u00f4 \u0111\u1ebfn nh\u1eefng th\u00f4ng tin c\u00f3 gi\u00e1 tr\u1ecb th\u1ef1c ti\u1ec5n<\/a><\/li>\n<li><a href=\"#step-7-the-foundation-of-reliability-documentation-and-trending\">B\u01b0\u1edbc 7: N\u1ec1n t\u1ea3ng c\u1ee7a \u0111\u1ed9 tin c\u1eady \u2013 T\u00e0i li\u1ec7u v\u00e0 ph\u00e2n t\u00edch xu h\u01b0\u1edbng<\/a><\/li>\n<li><a href=\"#frequently-asked-questions-faq\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQ)<\/a><\/li>\n<li><a href=\"#conclusion\">K\u1ebft lu\u1eadn<\/a><\/li>\n<li><a href=\"#references\">T\u00e0i li\u1ec7u tham kh\u1ea3o<\/a><\/li>\n<\/ul>\n<h2 id=\"understanding-the-core-principles-of-insulation-resistance\">Hi\u1ec3u r\u00f5 c\u00e1c nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n v\u1ec1 \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n<\/h2>\n<p>Tr\u01b0\u1edbc khi b\u1eaft tay v\u00e0o c\u00e1c b\u01b0\u1edbc th\u1ef1c h\u00e0nh \u0111\u1ec3 ti\u1ebfn h\u00e0nh ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n, \u0111i\u1ec1u quan tr\u1ecdng h\u00e0ng \u0111\u1ea7u l\u00e0 ph\u1ea3i n\u1eafm v\u1eefng c\u00e1c kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n li\u00ean quan. H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng d\u00e2y d\u1eabn \u0111\u1ed3ng trong m\u1ed9t s\u1ee3i d\u00e2y nh\u01b0 m\u1ed9t \u0111\u01b0\u1eddng \u1ed1ng d\u1eabn n\u01b0\u1edbc, v\u00e0 l\u1edbp c\u00e1ch \u0111i\u1ec7n bao quanh n\u00f3 nh\u01b0 th\u00e0nh c\u1ee7a \u0111\u01b0\u1eddng \u1ed1ng \u0111\u00f3. Trong m\u1ed9t th\u1ebf gi\u1edbi l\u00fd t\u01b0\u1edfng, th\u00e0nh \u1ed1ng l\u00e0 ho\u00e0n h\u1ea3o v\u00e0 kh\u00f4ng c\u00f3 n\u01b0\u1edbc r\u00f2 r\u1ec9 ra ngo\u00e0i. T\u01b0\u01a1ng t\u1ef1 nh\u01b0 v\u1eady, l\u1edbp c\u00e1ch \u0111i\u1ec7n ho\u00e0n h\u1ea3o s\u1ebd ng\u0103n ch\u1eb7n b\u1ea5t k\u1ef3 d\u00f2ng \u0111i\u1ec7n n\u00e0o \"r\u00f2 r\u1ec9\" ra kh\u1ecfi d\u00e2y d\u1eabn. Trong th\u1ef1c t\u1ebf, kh\u00f4ng c\u00f3 l\u1edbp c\u00e1ch \u0111i\u1ec7n n\u00e0o l\u00e0 ho\u00e0n h\u1ea3o. S\u1ebd lu\u00f4n c\u00f3 m\u1ed9t l\u01b0\u1ee3ng d\u00f2ng r\u00f2 r\u1ec9 c\u1ef1c k\u1ef3 nh\u1ecf \u0111i qua v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n xu\u1ed1ng \u0111\u1ea5t ho\u1eb7c gi\u1eefa c\u00e1c d\u00e2y d\u1eabn.<\/p>\n<p>M\u1ee5c \u0111\u00edch c\u1ee7a th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n l\u00e0 \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 m\u1ee9c \u0111\u1ed9 \u201cho\u00e0n h\u1ea3o\u201d c\u1ee7a l\u1edbp c\u00e1ch \u0111i\u1ec7n \u0111\u00f3. Ch\u00fang ta th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u (DC) v\u00e0 \u0111o d\u00f2ng r\u00f2 r\u1ea5t nh\u1ecf n\u00e0y. D\u1ef1a tr\u00ean \u0110\u1ecbnh lu\u1eadt Ohm (\u0110i\u1ec7n tr\u1edf = \u0110i\u1ec7n \u00e1p \/ D\u00f2ng \u0111i\u1ec7n), thi\u1ebft b\u1ecb th\u1eed nghi\u1ec7m, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u00e1y \u0111o megohm, s\u1ebd t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u1edf c\u1ee7a l\u1edbp c\u00e1ch \u0111i\u1ec7n. Gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf cao, th\u01b0\u1eddng \u1edf m\u1ee9c h\u00e0ng tri\u1ec7u ohm (megohm) ho\u1eb7c th\u1eadm ch\u00ed h\u00e0ng t\u1ef7 ohm (gigohm), cho th\u1ea5y l\u1edbp c\u00e1ch \u0111i\u1ec7n \u0111ang \u1edf trong t\u00ecnh tr\u1ea1ng tuy\u1ec7t v\u1eddi v\u00e0 ng\u0103n ch\u1eb7n d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. Ng\u01b0\u1ee3c l\u1ea1i, gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf th\u1ea5p cho th\u1ea5y l\u1edbp c\u00e1ch \u0111i\u1ec7n \u0111\u00e3 b\u1ecb h\u01b0 h\u1ecfng, c\u00f3 th\u1ec3 do \u0111\u1ed9 \u1ea9m, b\u1ee5i b\u1ea9n, h\u01b0 h\u1ecfng v\u1eadt l\u00fd ho\u1eb7c t\u00e1c \u0111\u1ed9ng h\u00f3a h\u1ecdc, t\u1ea1o ra \u0111\u01b0\u1eddng d\u1eabn cho d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9. T\u00ecnh tr\u1ea1ng n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0 v\u1ea5n \u0111\u1ec1 v\u1ec1 hi\u1ec7u su\u1ea5t k\u00e9m; n\u00f3 l\u00e0 nguy\u00ean nh\u00e2n tr\u1ef1c ti\u1ebfp d\u1eabn \u0111\u1ebfn c\u00e1c s\u1ef1 c\u1ed1 \u0111i\u1ec7n, ch\u1eadp m\u1ea1ch v\u00e0 c\u00f3 th\u1ec3 g\u00e2y ra h\u1ecfng h\u00f3c thi\u1ebft b\u1ecb nghi\u00eam tr\u1ecdng ho\u1eb7c nguy c\u01a1 \u0111i\u1ec7n gi\u1eadt.<\/p>\n<h3 id=\"the-anatomy-of-test-current\">C\u1ea5u tr\u00fac c\u1ee7a d\u00f2ng \u0111i\u1ec7n th\u1eed nghi\u1ec7m<\/h3>\n<p>Khi \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u v\u00e0o v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n, t\u1ed5ng d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c thi\u1ebft b\u1ecb \u0111o \u0111\u01b0\u1ee3c kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t gi\u00e1 tr\u1ecb \u0111\u01a1n l\u1ebb, \u0111\u01a1n gi\u1ea3n. \u0110\u00f3 l\u00e0 t\u1ed5ng h\u1ee3p c\u1ee7a ba d\u00f2ng \u0111i\u1ec7n ri\u00eang bi\u1ec7t, v\u00e0 vi\u1ec7c hi\u1ec3u r\u00f5 \u0111\u1eb7c t\u00ednh ri\u00eang c\u1ee7a t\u1eebng d\u00f2ng \u0111i\u1ec7n l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 gi\u1ea3i th\u00edch ch\u00ednh x\u00e1c c\u00e1c th\u1eed nghi\u1ec7m n\u00e2ng cao nh\u01b0 Ch\u1ec9 s\u1ed1 ph\u00e2n c\u1ef1c (PI).<\/p>\n<ol>\n<li>\n<p><strong>D\u00f2ng s\u1ea1c \u0111i\u1ec7n dung:<\/strong> \u0110\u00e2y l\u00e0 d\u00f2ng \u0111i\u1ec7n c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed1i cao, ch\u1ec9 l\u01b0u th\u00f4ng trong m\u1ed9t kho\u1ea3ng th\u1eddi gian r\u1ea5t ng\u1eafn ngay khi b\u1eaft \u0111\u1ea7u th\u1eed nghi\u1ec7m, th\u01b0\u1eddng ch\u1ec9 k\u00e9o d\u00e0i v\u00e0i gi\u00e2y. \u0110\u00e2y l\u00e0 d\u00f2ng \u0111i\u1ec7n c\u1ea7n thi\u1ebft \u0111\u1ec3 n\u1ea1p \u0111i\u1ec7n cho \u0111i\u1ec7n dung t\u1ef1 nhi\u00ean c\u1ee7a thi\u1ebft b\u1ecb \u0111ang \u0111\u01b0\u1ee3c th\u1eed nghi\u1ec7m. C\u00f3 th\u1ec3 h\u00ecnh dung n\u00f3 nh\u01b0 d\u00f2ng n\u01b0\u1edbc ch\u1ea3y m\u1ea1nh ban \u0111\u1ea7u c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m \u0111\u1ea7y \u1ed1ng tr\u01b0\u1edbc khi d\u00f2ng ch\u1ea3y \u1ed5n \u0111\u1ecbnh \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp. D\u00f2ng \u0111i\u1ec7n n\u00e0y gi\u1ea3m xu\u1ed1ng g\u1ea7n nh\u01b0 b\u1eb1ng kh\u00f4ng r\u1ea5t nhanh ch\u00f3ng.<\/p>\n<\/li>\n<li>\n<p><strong>D\u00f2ng \u0111i\u1ec7n h\u1ea5p th\u1ee5 \u0111i\u1ec7n m\u00f4i:<\/strong> D\u00f2ng \u0111i\u1ec7n n\u00e0y \u0111\u01b0\u1ee3c h\u00fat v\u00e0o ch\u00ednh v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n khi c\u00e1c ph\u00e2n t\u1eed b\u00ean trong ch\u1ea5t \u0111i\u1ec7n m\u00f4i b\u1ecb ph\u00e2n c\u1ef1c b\u1edfi \u0111i\u1ec7n tr\u01b0\u1eddng. \u0110\u00e2y l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh di\u1ec5n ra ch\u1eadm h\u01a1n so v\u1edbi qu\u00e1 tr\u00ecnh t\u00edch \u0111i\u1ec7n t\u1ee5 \u0111i\u1ec7n. Trong v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n t\u1ed1t, d\u00f2ng \u0111i\u1ec7n n\u00e0y ban \u0111\u1ea7u c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 cao h\u01a1n v\u00e0 gi\u1ea3m d\u1ea7n trong v\u00e0i ph\u00fat khi c\u00e1c ph\u00e2n t\u1eed s\u1eafp x\u1ebfp theo h\u01b0\u1edbng nh\u1ea5t \u0111\u1ecbnh. Qu\u00e1 tr\u00ecnh n\u00e0y t\u01b0\u01a1ng t\u1ef1 nh\u01b0 vi\u1ec7c v\u1eadt li\u1ec7u \u1ed1ng t\u1ef1 h\u1ea5p th\u1ee5 m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf n\u01b0\u1edbc cho \u0111\u1ebfn khi \u0111\u1ea1t \u0111\u1ebfn tr\u1ea1ng th\u00e1i b\u00e3o h\u00f2a. T\u1ed1c \u0111\u1ed9 suy gi\u1ea3m c\u1ee7a d\u00f2ng \u0111i\u1ec7n n\u00e0y l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1 quan tr\u1ecdng ph\u1ea3n \u00e1nh t\u00ecnh tr\u1ea1ng c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n.<\/p>\n<\/li>\n<li>\n<p><strong>D\u00f2ng r\u00f2 (ho\u1eb7c d\u00f2ng d\u1eabn):<\/strong> \u0110\u00e2y l\u00e0 d\u00f2ng \u0111i\u1ec7n nh\u1ecf v\u00e0 \u1ed5n \u0111\u1ecbnh ch\u1ea3y qua v\u00e0 xuy\u00ean qua l\u1edbp c\u00e1ch \u0111i\u1ec7n. \u0110\u00e2y ch\u00ednh l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng \u201cr\u00f2 r\u1ec9\u201d th\u1ef1c s\u1ef1 trong v\u00ed d\u1ee5 v\u1ec1 \u0111\u01b0\u1eddng \u1ed1ng c\u1ee7a ch\u00fang ta. Trong \u0111i\u1ec1u ki\u1ec7n l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u00f2n t\u1ed1t, s\u1ea1ch v\u00e0 kh\u00f4, d\u00f2ng \u0111i\u1ec7n n\u00e0y c\u1ef1c k\u1ef3 nh\u1ecf v\u00e0 duy tr\u00ec \u1ed5n \u0111\u1ecbnh trong su\u1ed1t qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m. N\u1ebfu l\u1edbp c\u00e1ch \u0111i\u1ec7n b\u1ecb nhi\u1ec5m \u1ea9m ho\u1eb7c b\u1ee5i b\u1ea9n, ho\u1eb7c b\u1ecb h\u01b0 h\u1ecfng v\u1ec1 m\u1eb7t v\u1eadt l\u00fd, d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 s\u1ebd cao h\u01a1n nhi\u1ec1u. \u0110\u00e2y l\u00e0 th\u00f4ng s\u1ed1 m\u00e0 ch\u00fang ta quan t\u00e2m nh\u1ea5t khi \u0111o l\u01b0\u1eddng, v\u00ec n\u00f3 l\u00e0 ch\u1ec9 s\u1ed1 tr\u1ef1c ti\u1ebfp ph\u1ea3n \u00e1nh \u0111\u1ed9 to\u00e0n v\u1eb9n c\u1ee7a l\u1edbp c\u00e1ch \u0111i\u1ec7n.<\/p>\n<\/li>\n<\/ol>\n<p>Do \u0111\u00f3, th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t \u201cb\u1ee9c \u1ea3nh ch\u1ee5p nhanh\u201d m\u00e0 l\u00e0 s\u1ef1 quan s\u00e1t \u0111\u1ed9ng v\u1ec1 c\u00e1ch c\u00e1c d\u00f2ng \u0111i\u1ec7n n\u00e0y bi\u1ebfn \u0111\u1ed5i theo th\u1eddi gian. M\u1ed9t cu\u1ed9c ki\u1ec3m tra ng\u1eabu nhi\u00ean \u0111\u01a1n gi\u1ea3n c\u00f3 th\u1ec3 ch\u1ec9 cho b\u1ea1n m\u1ed9t gi\u00e1 tr\u1ecb duy nh\u1ea5t, nh\u01b0ng m\u1ed9t th\u1eed nghi\u1ec7m c\u00f3 th\u1eddi gian, nh\u01b0 th\u1eed nghi\u1ec7m PI, t\u1eadn d\u1ee5ng s\u1ef1 suy gi\u1ea3m ch\u1eadm c\u1ee7a d\u00f2ng \u0111i\u1ec7n h\u1ea5p th\u1ee5 \u0111\u1ec3 \u0111\u01b0a ra ch\u1ea9n \u0111o\u00e1n s\u00e2u s\u1eafc v\u00e0 \u0111\u00e1ng tin c\u1eady h\u01a1n nhi\u1ec1u v\u1ec1 t\u00ecnh tr\u1ea1ng c\u1ee7a l\u1edbp c\u00e1ch \u0111i\u1ec7n.<\/p>\n<h2 id=\"step-1-the-primacy-of-safety-de-energization-and-isolation\">B\u01b0\u1edbc 1: An to\u00e0n l\u00e0 tr\u00ean h\u1ebft \u2013 Ng\u1eaft ngu\u1ed3n v\u00e0 c\u00e1ch ly<\/h2>\n<p>H\u00e0nh tr\u00ecnh v\u01b0\u01a1n t\u1edbi m\u1ee9c \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n 1.000 megohm b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t b\u01b0\u1edbc duy nh\u1ea5t v\u00e0 kh\u00f4ng th\u1ec3 th\u1ecfa hi\u1ec7p: an to\u00e0n. Vi\u1ec7c th\u1ef1c hi\u1ec7n ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n tr\u00ean m\u1ea1ch \u0111ang c\u00f3 \u0111i\u1ec7n kh\u00f4ng ch\u1ec9 l\u00e0 v\u00f4 \u00edch \u2014 v\u00ec \u0111i\u1ec7n \u00e1p h\u1ec7 th\u1ed1ng s\u1ebd l\u00e0m qu\u00e1 t\u1ea3i thi\u1ebft b\u1ecb \u0111o \u2014 m\u00e0 c\u00f2n c\u1ef1c k\u1ef3 nguy hi\u1ec3m, ti\u1ec1m \u1ea9n nguy c\u01a1 t\u1eed vong do \u0111i\u1ec7n gi\u1eadt v\u00e0 tia l\u1eeda \u0111i\u1ec7n. H\u00e0nh \u0111\u1ed9ng \u0111\u1ea7u ti\u00ean v\u00e0 quan tr\u1ecdng nh\u1ea5t l\u00e0 ph\u1ea3i ng\u1eaft ho\u00e0n to\u00e0n ngu\u1ed3n \u0111i\u1ec7n v\u00e0 c\u00e1ch ly thi\u1ebft b\u1ecb c\u1ea7n ki\u1ec3m tra.<\/p>\n<p>Quy tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh c\u1ee5 th\u1ec3 th\u00f4ng qua quy tr\u00ecnh \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Kh\u00f3a\/G\u1eafn th\u1ebb (LOTO). \u0110\u00e2y kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t khuy\u1ebfn ngh\u1ecb \u0111\u01a1n thu\u1ea7n m\u00e0 l\u00e0 m\u1ed9t quy tr\u00ecnh c\u1ee9u m\u1ea1ng \u0111\u01b0\u1ee3c c\u00e1c c\u01a1 quan an to\u00e0n lao \u0111\u1ed9ng tr\u00ean to\u00e0n th\u1ebf gi\u1edbi, nh\u01b0 C\u01a1 quan Qu\u1ea3n l\u00fd An to\u00e0n v\u00e0 S\u1ee9c kh\u1ecfe Lao \u0111\u1ed9ng (OSHA) c\u1ee7a Hoa K\u1ef3, quy \u0111\u1ecbnh b\u1eaft bu\u1ed9c. M\u1eb7c d\u00f9 c\u00e1c quy \u0111\u1ecbnh c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y theo khu v\u1ef1c, nh\u01b0ng c\u00e1c nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n v\u1eabn mang t\u00ednh ph\u1ed5 qu\u00e1t.<\/p>\n<h3 id=\"the-lockout-tagout-loto-protocol\">Quy tr\u00ecnh Kh\u00f3a\/G\u1eafn nh\u00e3n (LOTO)<\/h3>\n<p>M\u1ee5c ti\u00eau c\u1ed1t l\u00f5i c\u1ee7a LOTO l\u00e0 \u0111\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb \u0111i\u1ec7n kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n tr\u1edf l\u1ea1i, d\u00f9 l\u00e0 do v\u00f4 t\u00ecnh hay c\u1ed1 \u00fd, trong qu\u00e1 tr\u00ecnh th\u1ef1c hi\u1ec7n c\u00f4ng t\u00e1c b\u1ea3o tr\u00ec.<\/p>\n<ol>\n<li><strong>Th\u00f4ng b\u00e1o:<\/strong> Th\u00f4ng b\u00e1o cho t\u1ea5t c\u1ea3 nh\u00e2n vi\u00ean c\u00f3 li\u00ean quan r\u1eb1ng thi\u1ebft b\u1ecb s\u1ebd \u0111\u01b0\u1ee3c t\u1eaft v\u00e0 kh\u00f3a l\u1ea1i \u0111\u1ec3 ti\u1ebfn h\u00e0nh ki\u1ec3m tra. Vi\u1ec7c truy\u1ec1n \u0111\u1ea1t th\u00f4ng tin r\u00f5 r\u00e0ng s\u1ebd gi\u00fap tr\u00e1nh nh\u1ea7m l\u1eabn v\u00e0 nh\u1eefng n\u1ed7 l\u1ef1c v\u00f4 t\u00ecnh kh\u1edfi \u0111\u1ed9ng l\u1ea1i m\u00e1y m\u00f3c.<\/li>\n<li><strong>T\u1eaft m\u00e1y:<\/strong> Th\u1ef1c hi\u1ec7n theo c\u00e1c quy tr\u00ecnh d\u1eebng m\u00e1y th\u00f4ng th\u01b0\u1eddng \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb.<\/li>\n<li><strong>C\u00e1ch ly:<\/strong> M\u1edf thi\u1ebft b\u1ecb ng\u1eaft ch\u00ednh, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u1ea7u dao ho\u1eb7c c\u00f4ng t\u1eafc ng\u1eaft, \u0111\u1ec3 ng\u1eaft d\u00f2ng \u0111i\u1ec7n.<\/li>\n<li><strong>Kh\u00f3a v\u00e0 d\u00e1n nh\u00e3n:<\/strong> M\u1ed9t ch\u1ed1t kh\u00f3a v\u1eadt l\u00fd \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o thi\u1ebft b\u1ecb ng\u1eaft k\u1ebft n\u1ed1i \u1edf v\u1ecb tr\u00ed m\u1edf ho\u1eb7c \"t\u1eaft\". M\u1ed7i ng\u01b0\u1eddi l\u00e0m vi\u1ec7c tr\u00ean thi\u1ebft b\u1ecb ph\u1ea3i t\u1ef1 g\u1eafn ch\u1ed1t kh\u00f3a c\u00e1 nh\u00e2n c\u1ee7a m\u00ecnh. M\u1ed9t th\u1ebb \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o ch\u1ed1t kh\u00f3a, ghi r\u00f5 t\u00ean ng\u01b0\u1eddi lao \u0111\u1ed9ng, ng\u00e0y th\u00e1ng v\u00e0 l\u00fd do kh\u00f3a thi\u1ebft b\u1ecb. Th\u1ebb n\u00e0y \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t c\u1ea3nh b\u00e1o r\u00f5 r\u00e0ng: \"Nguy hi\u1ec3m \u2013 Kh\u00f4ng \u0111\u01b0\u1ee3c v\u1eadn h\u00e0nh.\"<\/li>\n<li><strong>Ki\u1ec3m tra t\u00ecnh tr\u1ea1ng ng\u1eaft ngu\u1ed3n:<\/strong> \u0110\u00e2y c\u00f3 l\u1ebd l\u00e0 b\u01b0\u1edbc th\u01b0\u1eddng b\u1ecb b\u1ecf qua nh\u1ea5t nh\u01b0ng l\u1ea1i v\u00f4 c\u00f9ng quan tr\u1ecdng trong quy tr\u00ecnh. Sau khi ng\u1eaft ngu\u1ed3n, b\u1ea1n ph\u1ea3i ki\u1ec3m tra xem c\u00f3 c\u00f2n \u0111i\u1ec7n \u00e1p hay kh\u00f4ng. S\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng ho\u1eb7c m\u00e1y ki\u1ec3m tra \u0111i\u1ec7n \u00e1p c\u00f3 c\u00f4ng su\u1ea5t ph\u00f9 h\u1ee3p v\u00e0 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t, b\u1ea1n ph\u1ea3i ki\u1ec3m tra m\u1ea1ch \u0111i\u1ec7n \u0111\u1ec3 x\u00e1c nh\u1eadn r\u1eb1ng n\u00f3 th\u1ef1c s\u1ef1 \u0111\u00e3 \"ng\u1eaft \u0111i\u1ec7n\". M\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra ph\u1ed5 bi\u1ebfn v\u00e0 \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb l\u00e0 ph\u01b0\u01a1ng ph\u00e1p \"Live-Dead-Live\": ki\u1ec3m tra m\u1ed9t ngu\u1ed3n \u0111i\u1ec7n \u0111\u00e3 bi\u1ebft l\u00e0 c\u00f3 \u0111i\u1ec7n \u0111\u1ec3 x\u00e1c nh\u1eadn \u0111\u1ed3ng h\u1ed3 c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng, ki\u1ec3m tra m\u1ea1ch \u0111i\u1ec7n \u0111\u00e3 ng\u1eaft \u0111\u1ec3 x\u00e1c nh\u1eadn r\u1eb1ng n\u00f3 \u0111\u00e3 ng\u1eaft \u0111i\u1ec7n, v\u00e0 sau \u0111\u00f3 ki\u1ec3m tra l\u1ea1i ngu\u1ed3n \u0111i\u1ec7n \u0111\u00e3 bi\u1ebft l\u00e0 c\u00f3 \u0111i\u1ec7n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed3ng h\u1ed3 c\u1ee7a b\u1ea1n v\u1eabn ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng trong su\u1ed1t qu\u00e1 tr\u00ecnh.<\/li>\n<\/ol>\n<h3 id=\"discharging-stored-energy\">Ph\u00f3ng th\u00edch n\u0103ng l\u01b0\u1ee3ng t\u00edch tr\u1eef<\/h3>\n<p>Ch\u1ec9 c\u1ea7n ng\u1eaft c\u00f4ng t\u1eafc kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng \u0111\u1ee7. Nhi\u1ec1u h\u1ec7 th\u1ed1ng \u0111i\u1ec7n, \u0111\u1eb7c bi\u1ec7t l\u00e0 nh\u1eefng h\u1ec7 th\u1ed1ng c\u00f3 t\u1ee5 \u0111i\u1ec7n l\u1edbn ho\u1eb7c \u0111\u01b0\u1eddng d\u00e2y c\u00e1p d\u00e0i, c\u00f3 th\u1ec3 v\u1eabn c\u00f2n t\u00edch \u0111i\u1ec7n nguy hi\u1ec3m ngay c\u1ea3 sau khi \u0111\u00e3 ng\u1eaft k\u1ebft n\u1ed1i v\u1edbi ngu\u1ed3n \u0111i\u1ec7n. Tr\u01b0\u1edbc khi k\u1ebft n\u1ed1i b\u1ea5t k\u1ef3 d\u00e2y \u0111o n\u00e0o, thi\u1ebft b\u1ecb ph\u1ea3i \u0111\u01b0\u1ee3c x\u1ea3 \u0111i\u1ec7n an to\u00e0n xu\u1ed1ng \u0111\u1ea5t. C\u00e1c m\u00e1y \u0111o megohm hi\u1ec7n \u0111\u1ea1i th\u01b0\u1eddng c\u00f3 ch\u1ee9c n\u0103ng x\u1ea3 \u0111i\u1ec7n t\u1ef1 \u0111\u1ed9ng, nh\u01b0ng t\u1ed1t nh\u1ea5t l\u00e0 n\u00ean s\u1eed d\u1ee5ng que x\u1ea3 \u0111i\u1ec7n chuy\u00ean d\u1ee5ng ho\u1eb7c n\u1ed1i \u0111\u1ea5t c\u00e1c d\u00e2y d\u1eabn trong m\u1ed9t kho\u1ea3ng th\u1eddi gian \u0111\u1ee7 \u0111\u1ec3 ti\u00eau t\u00e1n b\u1ea5t k\u1ef3 \u0111i\u1ec7n t\u00edch n\u00e0o c\u00f2n l\u01b0u tr\u1eef, th\u01b0\u1eddng l\u00e0 v\u00e0i ph\u00fat \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb l\u1edbn. Lu\u00f4n gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng v\u1eabn c\u00f2n n\u0103ng l\u01b0\u1ee3ng l\u01b0u tr\u1eef cho \u0111\u1ebfn khi \u0111\u01b0\u1ee3c ch\u1ee9ng minh ng\u01b0\u1ee3c l\u1ea1i. N\u1ebfu kh\u00f4ng tu\u00e2n th\u1ee7 nghi\u00eam ng\u1eb7t c\u00e1c quy t\u1eafc an to\u00e0n n\u00e0y, c\u00e1c thi\u1ebft b\u1ecb ki\u1ec3m tra v\u00e0 k\u1ef9 thu\u1eadt ch\u1ea9n \u0111o\u00e1n ti\u00ean ti\u1ebfn nh\u1ea5t c\u0169ng tr\u1edf n\u00ean v\u00f4 ngh\u0129a tr\u01b0\u1edbc nh\u1eefng th\u1ea3m k\u1ecbch c\u00f3 th\u1ec3 ph\u00f2ng ng\u1eeba \u0111\u01b0\u1ee3c.<\/p>\n<h2 id=\"step-2-preparing-the-test-subject-and-environment\">B\u01b0\u1edbc 2: Chu\u1ea9n b\u1ecb \u0111\u1ed1i t\u01b0\u1ee3ng th\u1eed nghi\u1ec7m v\u00e0 m\u00f4i tr\u01b0\u1eddng<\/h2>\n<p>Sau khi thi\u1ebft b\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e1ch ly an to\u00e0n, giai \u0111o\u1ea1n ti\u1ebfp theo l\u00e0 chu\u1ea9n b\u1ecb c\u1ea3 thi\u1ebft b\u1ecb v\u00e0 m\u00f4i tr\u01b0\u1eddng xung quanh cho qu\u00e1 tr\u00ecnh ki\u1ec3m tra. C\u00e1c gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c t\u1eeb th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n r\u1ea5t nh\u1ea1y c\u1ea3m v\u1edbi c\u00e1c y\u1ebfu t\u1ed1 b\u00ean ngo\u00e0i. N\u1ebfu kh\u00f4ng t\u00ednh \u0111\u1ebfn nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y, k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c c\u00f3 th\u1ec3 b\u1ecb sai l\u1ec7ch, d\u1eabn \u0111\u1ebfn vi\u1ec7c lo\u1ea1i b\u1ecf nh\u1eefng thi\u1ebft b\u1ecb v\u1eabn c\u00f2n ho\u1ea1t \u0111\u1ed9ng t\u1ed1t ho\u1eb7c, nguy hi\u1ec3m h\u01a1n, ch\u1ea5p nh\u1eadn nh\u1eefng thi\u1ebft b\u1ecb \u0111ang \u1edf b\u1edd v\u1ef1c h\u1ecfng h\u00f3c.<\/p>\n<p>Hai y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng c\u00f3 \u1ea3nh h\u01b0\u1edfng l\u1edbn nh\u1ea5t l\u00e0 nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ea9m, trong khi \u00f4 nhi\u1ec5m b\u1ec1 m\u1eb7t \u0111\u1ee9ng \u1edf v\u1ecb tr\u00ed th\u1ee9 ba, kh\u00f4ng k\u00e9m ph\u1ea7n quan tr\u1ecdng.<\/p>\n<h3 id=\"the-influence-of-temperature\">\u1ea2nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9<\/h3>\n<p>Nhi\u1ec7t \u0111\u1ed9 c\u00f3 \u1ea3nh h\u01b0\u1edfng s\u00e2u s\u1eafc \u0111\u1ebfn \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n. Theo quy lu\u1eadt chung, c\u1ee9 khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng 10\u00b0C, \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n s\u1ebd gi\u1ea3m m\u1ed9t n\u1eeda. Ng\u01b0\u1ee3c l\u1ea1i, c\u1ee9 khi nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m 10\u00b0C, \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n s\u1ebd t\u0103ng g\u1ea5p \u0111\u00f4i. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra do nhi\u1ec7t l\u00e0m t\u0103ng \u0111\u1ed9 di \u0111\u1ed9ng c\u1ee7a c\u00e1c electron b\u00ean trong v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n, khi\u1ebfn d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 d\u1ec5 d\u00e0ng \u0111i qua h\u01a1n.<\/p>\n<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea1n \u0111ang c\u1ed1 so s\u00e1nh hai k\u1ebft qu\u1ea3 \u0111o: m\u1ed9t \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n v\u00e0o m\u1ed9t bu\u1ed5i s\u00e1ng m\u00f9a \u0111\u00f4ng se l\u1ea1nh v\u1edbi nhi\u1ec7t \u0111\u1ed9 10\u00b0C v\u00e0 m\u1ed9t v\u00e0o m\u1ed9t bu\u1ed5i chi\u1ec1u m\u00f9a h\u00e8 oi b\u1ee9c v\u1edbi nhi\u1ec7t \u0111\u1ed9 30\u00b0C. Ngay c\u1ea3 khi t\u00ecnh tr\u1ea1ng th\u1ef1c t\u1ebf c\u1ee7a l\u1edbp c\u00e1ch nhi\u1ec7t kh\u00f4ng thay \u0111\u1ed5i, k\u1ebft qu\u1ea3 \u0111o \u1edf 30\u00b0C c\u00f3 th\u1ec3 th\u1ea5p h\u01a1n t\u1edbi b\u1ed1n l\u1ea7n so v\u1edbi k\u1ebft qu\u1ea3 \u0111o \u1edf 10\u00b0C. N\u1ebfu kh\u00f4ng \u0111i\u1ec1u ch\u1ec9nh s\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 nh\u1ea7m l\u1eabn v\u00e0 k\u1ebft lu\u1eadn r\u1eb1ng l\u1edbp c\u00e1ch nhi\u1ec7t \u0111\u00e3 b\u1ecb suy gi\u1ea3m \u0111\u00e1ng k\u1ec3.<\/p>\n<p>V\u00ec l\u00fd do n\u00e0y, t\u1ea5t c\u1ea3 c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh b\u1ea3o tr\u00ec d\u1ef1 \u0111o\u00e1n uy t\u00edn \u0111\u1ec1u chu\u1ea9n h\u00f3a c\u00e1c gi\u00e1 tr\u1ecb \u0111o c\u1ee7a m\u00ecnh theo m\u1ed9t nhi\u1ec7t \u0111\u1ed9 tham chi\u1ebfu chung, th\u01b0\u1eddng l\u00e0 40\u00b0C, theo khuy\u1ebfn ngh\u1ecb c\u1ee7a c\u00e1c ti\u00eau chu\u1ea9n nh\u01b0 IEEE 43-2013. \u0110\u1ec3 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y, b\u1ea1n ph\u1ea3i ghi l\u1ea1i nhi\u1ec7t \u0111\u1ed9 c\u1ee7a cu\u1ed9n d\u00e2y ho\u1eb7c l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a thi\u1ebft b\u1ecb t\u1ea1i th\u1eddi \u0111i\u1ec3m ki\u1ec3m tra. Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng b\u1ea3ng hi\u1ec7u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh gi\u00e1 tr\u1ecb \u0111o c\u1ee7a m\u00ecnh.<\/p>\n<table class=\"mce-item-table\" style=\"width:100%; border-collapse: collapse;\" border=\"1\">\n<thead>\n<tr>\n<th style=\"text-align:left;\">Nhi\u1ec7t \u0111\u1ed9 cu\u1ed9n d\u00e2y (\u00b0C)<\/th>\n<th style=\"text-align:left;\">H\u1ec7 s\u1ed1 hi\u1ec7u ch\u1ec9nh (\u0111\u1ebfn 40\u00b0C)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;\">0<\/td>\n<td style=\"text-align:left;\">0.06<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">5<\/td>\n<td style=\"text-align:left;\">0.08<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">10<\/td>\n<td style=\"text-align:left;\">0.12<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">15<\/td>\n<td style=\"text-align:left;\">0.18<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">20<\/td>\n<td style=\"text-align:left;\">0.25<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">25<\/td>\n<td style=\"text-align:left;\">0.36<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">30<\/td>\n<td style=\"text-align:left;\">0.50<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">35<\/td>\n<td style=\"text-align:left;\">0.75<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\"><strong>40<\/strong><\/td>\n<td style=\"text-align:left;\"><strong>1,00 (Nhi\u1ec7t \u0111\u1ed9 c\u01a1 b\u1ea3n)<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">45<\/td>\n<td style=\"text-align:left;\">1.50<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">50<\/td>\n<td style=\"text-align:left;\">2.00<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">55<\/td>\n<td style=\"text-align:left;\">3.00<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">60<\/td>\n<td style=\"text-align:left;\">4.00<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">65<\/td>\n<td style=\"text-align:left;\">6.00<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">70<\/td>\n<td style=\"text-align:left;\">8.00<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>C\u00e1ch s\u1eed d\u1ee5ng b\u1ea3ng:<\/strong>\u0110i\u1ec7n tr\u1edf \u0111\u00e3 hi\u1ec7u ch\u1ec9nh = \u0110i\u1ec7n tr\u1edf \u0111o \u0111\u01b0\u1ee3c \u00d7 H\u1ec7 s\u1ed1 hi\u1ec7u ch\u1ec9nh. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n \u0111o \u0111\u01b0\u1ee3c 200 M\u03a9 \u1edf 25\u00b0C, gi\u00e1 tr\u1ecb \u0111\u00e3 hi\u1ec7u ch\u1ec9nh t\u01b0\u01a1ng \u1ee9ng v\u1edbi 40\u00b0C s\u1ebd l\u00e0 200 M\u03a9 \u00d7 0,36 = 72 M\u03a9. Gi\u00e1 tr\u1ecb \u0111\u00e3 hi\u1ec7u ch\u1ec9nh n\u00e0y l\u00e0 gi\u00e1 tr\u1ecb b\u1ea1n n\u00ean s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e2n t\u00edch xu h\u01b0\u1edbng v\u00e0 so s\u00e1nh theo th\u1eddi gian.<\/p>\n<h3 id=\"the-impact-of-humidity-and-contamination\">T\u00e1c \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9 \u1ea9m v\u00e0 \u00f4 nhi\u1ec5m<\/h3>\n<p>\u0110\u1ed9 \u1ea9m l\u00e0 k\u1ebb th\u00f9 kh\u00f4ng \u0111\u1ed9i tr\u1eddi chung c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n. Khi \u0111\u1ed9 \u1ea9m cao, m\u1ed9t l\u1edbp m\u00e0ng m\u1ecfng h\u01a1i n\u01b0\u1edbc c\u00f3 th\u1ec3 ng\u01b0ng t\u1ee5 tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a c\u00e1c b\u1ed9 ph\u1eadn c\u00e1ch \u0111i\u1ec7n, \u1ed1ng l\u00f3t v\u00e0 kh\u1ed1i \u0111\u1ea7u n\u1ed1i. L\u1edbp h\u01a1i n\u01b0\u1edbc n\u00e0y, th\u01b0\u1eddng k\u1ebft h\u1ee3p v\u1edbi b\u1ee5i, b\u1ea9n ho\u1eb7c c\u1eb7n d\u1ea7u, t\u1ea1o ra m\u1ed9t \u0111\u01b0\u1eddng d\u1eabn \u0111i\u1ec7n cho \u201cd\u00f2ng r\u00f2 b\u1ec1 m\u1eb7t\u201d. D\u00f2ng \u0111i\u1ec7n n\u00e0y kh\u00f4ng \u0111i qua ch\u00ednh v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n m\u00e0 ch\u1ec9 ch\u1ea1y d\u1ecdc theo b\u1ec1 m\u1eb7t c\u1ee7a n\u00f3.<\/p>\n<p>Thi\u1ebft b\u1ecb ki\u1ec3m tra kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c gi\u1eefa d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 qua l\u1edbp c\u00e1ch \u0111i\u1ec7n v\u00e0 d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a n\u00f3. Thi\u1ebft b\u1ecb n\u00e0y ch\u1ec9 \u0111o t\u1ed5ng d\u00f2ng \u0111i\u1ec7n. Do \u0111\u00f3, m\u1ed9t b\u1ed9 c\u00e1ch \u0111i\u1ec7n b\u1ea9n ho\u1eb7c \u1ea9m \u01b0\u1edbt c\u00f3 th\u1ec3 cho k\u1ebft qu\u1ea3 \u0111o \u0111i\u1ec7n tr\u1edf th\u1ea5p \u0111\u1ebfn m\u1ee9c \u0111\u00e1ng b\u00e1o \u0111\u1ed9ng, ngay c\u1ea3 khi l\u1edbp c\u00e1ch \u0111i\u1ec7n b\u00ean trong v\u1eabn ho\u00e0n to\u00e0n nguy\u00ean v\u1eb9n.<\/p>\n<p>Tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh ki\u1ec3m tra, b\u1eaft bu\u1ed9c ph\u1ea3i l\u00e0m s\u1ea1ch v\u00e0 lau kh\u00f4 k\u1ef9 l\u01b0\u1ee1ng b\u1ec1 m\u1eb7t c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n c\u1ea7n ki\u1ec3m tra. S\u1eed d\u1ee5ng m\u1ed9t mi\u1ebfng v\u1ea3i s\u1ea1ch, kh\u00f4, kh\u00f4ng x\u01a1 v\u00e0 dung m\u00f4i l\u00e0m s\u1ea1ch ph\u00f9 h\u1ee3p (lo\u1ea1i kh\u00f4ng g\u00e2y h\u01b0 h\u1ea1i cho v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n) \u0111\u1ec3 lo\u1ea1i b\u1ecf ho\u00e0n to\u00e0n c\u00e1c v\u1ebft d\u1ea7u, m\u1ee1, b\u1ee5i than v\u00e0 c\u00e1c t\u1ea1p ch\u1ea5t kh\u00e1c. \u0110\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb c\u00f3 nhi\u1ec7t \u0111\u1ed9 b\u1eb1ng ho\u1eb7c cao h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng c\u0169ng gi\u00fap ng\u0103n ng\u1eeba hi\u1ec7n t\u01b0\u1ee3ng ng\u01b0ng t\u1ee5 h\u01a1i \u1ea9m. Vi\u1ec7c s\u1eed d\u1ee5ng \u0111\u1ea7u n\u1ed1i \"guard\" tr\u00ean m\u00e1y \u0111o \u0111i\u1ec7n tr\u1edf, m\u00e0 ch\u00fang ta s\u1ebd th\u1ea3o lu\u1eadn trong B\u01b0\u1edbc 4, l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt hi\u1ec7u qu\u1ea3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 lo\u1ea1i b\u1ecf \u1ea3nh h\u01b0\u1edfng c\u1ee7a s\u1ef1 r\u00f2 r\u1ec9 b\u1ec1 m\u1eb7t n\u00e0y kh\u1ecfi k\u1ebft qu\u1ea3 \u0111o cu\u1ed1i c\u00f9ng.<\/p>\n<h2 id=\"step-3-selecting-the-appropriate-test-voltage\">B\u01b0\u1edbc 3: Ch\u1ecdn \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m ph\u00f9 h\u1ee3p<\/h2>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u (DC) \u0111\u1ec3 \u00e1p d\u1ee5ng trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh quan tr\u1ecdng. \u0110i\u1ec7n \u00e1p ph\u1ea3i \u0111\u1ee7 cao \u0111\u1ec3 t\u1ea1o \u00e1p l\u1ef1c hi\u1ec7u qu\u1ea3 l\u00ean l\u1edbp c\u00e1ch \u0111i\u1ec7n v\u00e0 ph\u00e1t hi\u1ec7n b\u1ea5t k\u1ef3 \u0111i\u1ec3m y\u1ebfu ti\u1ec1m \u1ea9n n\u00e0o, nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c qu\u00e1 cao \u0111\u1ebfn m\u1ee9c g\u00e2y qu\u00e1 t\u1ea3i v\u00e0 l\u00e0m h\u1ecfng v\u0129nh vi\u1ec5n l\u1edbp c\u00e1ch \u0111i\u1ec7n. \u00c1p d\u1ee5ng \u0111i\u1ec7n \u00e1p qu\u00e1 cao l\u00ean l\u1edbp c\u00e1ch \u0111i\u1ec7n l\u00e0 nguy\u00ean t\u1eafc \u0111\u1eb1ng sau m\u1ed9t lo\u1ea1i th\u1eed nghi\u1ec7m kh\u00e1c, \u0111\u00f3 l\u00e0 th\u1eed nghi\u1ec7m \u0111i\u1ec7n \u00e1p cao ho\u1eb7c \"Hipot\", m\u1ed9t th\u1eed nghi\u1ec7m ki\u1ec3m ch\u1ee9ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 xem li\u1ec7u l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c \u0111i\u1ec7n \u00e1p qu\u00e1 cao c\u1ee5 th\u1ec3 hay kh\u00f4ng. M\u1ee5c ti\u00eau c\u1ee7a ch\u00fang t\u00f4i v\u1edbi th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n l\u00e0 ch\u1ea9n \u0111o\u00e1n, kh\u00f4ng ph\u1ea3i ph\u00e1 h\u1ee7y.<\/p>\n<p>\u0110i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m th\u00edch h\u1ee3p \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh d\u1ef1a tr\u00ean m\u1ee9c \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c c\u1ee7a thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c th\u1eed nghi\u1ec7m. C\u00e1c ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u00e3 \u0111\u01b0a ra nh\u1eefng h\u01b0\u1edbng d\u1eabn r\u00f5 r\u00e0ng v\u1ec1 v\u1ea5n \u0111\u1ec1 n\u00e0y. Vi\u1ec7c s\u1eed d\u1ee5ng \u0111i\u1ec7n \u00e1p qu\u00e1 th\u1ea5p c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u1ee7 \u0111\u1ec3 v\u01b0\u1ee3t qua \u0111i\u1ec7n tr\u1edf c\u1ee7a m\u1ed9t khuy\u1ebft t\u1eadt nh\u1ecf, d\u1eabn \u0111\u1ebfn vi\u1ec7c m\u1ed9t l\u1ed7i ti\u1ec1m \u1ea9n c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n.<\/p>\n<p>H\u00e3y h\u00ecnh dung vi\u1ec7c n\u00e0y gi\u1ed1ng nh\u01b0 ki\u1ec3m tra r\u00f2 r\u1ec9 tr\u00ean m\u1ed9t \u0111\u01b0\u1eddng \u1ed1ng n\u01b0\u1edbc. Vi\u1ec7c s\u1eed d\u1ee5ng \u00e1p l\u1ef1c n\u01b0\u1edbc r\u1ea5t th\u1ea5p (\u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m th\u1ea5p) c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u1ee7 \u0111\u1ec3 \u0111\u1ea9y n\u01b0\u1edbc ch\u1ea3y qua m\u1ed9t v\u1ebft n\u1ee9t nh\u1ecf nh\u01b0 \u0111\u1ea7u kim. B\u1ea1n c\u1ea7n \u00e1p d\u1ee5ng m\u1ed9t \u00e1p l\u1ef1c t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi m\u1ee9c \u1ee9ng su\u1ea5t m\u00e0 \u0111\u01b0\u1eddng \u1ed1ng s\u1ebd ph\u1ea3i ch\u1ecbu khi v\u1eadn h\u00e0nh (m\u1ed9t \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m ph\u00f9 h\u1ee3p) \u0111\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c ch\u1ed7 r\u00f2 r\u1ec9.<\/p>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng ti\u00eau chu\u1ea9n, \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p t\u1eeb c\u00e1c ngu\u1ed3n nh\u01b0 Hi\u1ec7p h\u1ed9i Ki\u1ec3m tra \u0110i\u1ec7n Qu\u1ed1c t\u1ebf (NETA) v\u00e0 IEEE, cung c\u1ea5p c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m DC \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho c\u00e1c thi\u1ebft b\u1ecb AC v\u00e0 DC c\u00f3 c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt kh\u00e1c nhau.<\/p>\n<table class=\"mce-item-table\" style=\"width:100%; border-collapse: collapse;\" border=\"1\">\n<thead>\n<tr>\n<th style=\"text-align:left;\">\u0110i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c c\u1ee7a thi\u1ebft b\u1ecb (AC ho\u1eb7c DC)<\/th>\n<th style=\"text-align:left;\">\u0110i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m DC khuy\u1ebfn ngh\u1ecb<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;\">D\u01b0\u1edbi 100 V<\/td>\n<td style=\"text-align:left;\">100 V DC ho\u1eb7c 250 V DC<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">100 V \u0111\u1ebfn 250 V<\/td>\n<td style=\"text-align:left;\">250 V DC ho\u1eb7c 500 V DC<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">251 V \u0111\u1ebfn 600 V<\/td>\n<td style=\"text-align:left;\">500 V DC ho\u1eb7c 1000 V DC<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">601 V \u0111\u1ebfn 1000 V<\/td>\n<td style=\"text-align:left;\">1000 V DC<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">1001 V \u0111\u1ebfn 2500 V<\/td>\n<td style=\"text-align:left;\">1000 V DC ho\u1eb7c 2500 V DC<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">2501 V \u0111\u1ebfn 5000 V<\/td>\n<td style=\"text-align:left;\">2500 V DC ho\u1eb7c 5000 V DC<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">5.001 V \u0111\u1ebfn 12.000 V<\/td>\n<td style=\"text-align:left;\">5000 V DC<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">Tr\u00ean 12.000 V<\/td>\n<td style=\"text-align:left;\">5000 V DC ho\u1eb7c 10000 V DC<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"practical-considerations\">Nh\u1eefng v\u1ea5n \u0111\u1ec1 th\u1ef1c ti\u1ec5n<\/h3>\n<ul>\n<li><strong>Lu\u00f4n ki\u1ec3m tra nh\u00e3n hi\u1ec7u:<\/strong> B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean lu\u00f4n l\u00e0 ki\u1ec3m tra nh\u00e3n k\u1ef9 thu\u1eadt c\u1ee7a thi\u1ebft b\u1ecb \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c. \u0110\u1eebng \u0111o\u00e1n m\u00f2 hay t\u1ef1 \u00fd suy \u0111o\u00e1n.<\/li>\n<li><strong>M\u00e1y \u0111o megohm hi\u1ec7n \u0111\u1ea1i:<\/strong> C\u00e1c m\u00e1y \u0111o megohm k\u1ef9 thu\u1eadt s\u1ed1 hi\u1ec7n \u0111\u1ea1i cung c\u1ea5p nhi\u1ec1u m\u1ee9c \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn (v\u00ed d\u1ee5: 250V, 500V, 1kV, 2,5kV, 5kV). Lu\u00f4n ch\u1ecdn m\u1ee9c \u0111i\u1ec7n \u00e1p tr\u01b0\u1edbc khi k\u1ebft n\u1ed1i d\u00e2y \u0111o v\u1edbi thi\u1ebft b\u1ecb v\u00e0 b\u1eaft \u0111\u1ea7u th\u1eed nghi\u1ec7m.<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u00e1p th\u1ea5p:<\/strong> \u0110\u1ed1i v\u1edbi c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed nh\u1ea1y c\u1ea3m, h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng, th\u01b0\u1eddng n\u00ean s\u1eed d\u1ee5ng \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m th\u1ea5p h\u01a1n (v\u00ed d\u1ee5: 50V ho\u1eb7c 100V) \u0111\u1ec3 tr\u00e1nh l\u00e0m h\u1ecfng c\u00e1c m\u1ea1ch nh\u1ea1y c\u1ea3m, ngay c\u1ea3 khi \u0111i\u1ec7n \u00e1p t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng cao h\u01a1n. Lu\u00f4n tham kh\u1ea3o c\u00e1c khuy\u1ebfn ngh\u1ecb c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t linh ki\u1ec7n.<\/li>\n<li><strong>Thi\u1ebft b\u1ecb m\u1edbi so v\u1edbi thi\u1ebft b\u1ecb c\u0169:<\/strong> C\u00e1c gi\u00e1 tr\u1ecb trong b\u1ea3ng ch\u1ee7 y\u1ebfu \u00e1p d\u1ee5ng cho c\u00e1c th\u1eed nghi\u1ec7m b\u1ea3o d\u01b0\u1ee1ng \u0111\u1ecbnh k\u1ef3. \u0110\u1ed1i v\u1edbi thi\u1ebft b\u1ecb m\u1edbi ho\u1eb7c sau khi s\u1eeda ch\u1eefa l\u1edbn, nh\u00e0 s\u1ea3n xu\u1ea5t c\u00f3 th\u1ec3 quy \u0111\u1ecbnh m\u1ee9c \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m cao h\u01a1n m\u1ed9t ch\u00fat (nh\u01b0ng v\u1eabn th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi m\u1ee9c Hipot) \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a c\u00f4ng t\u00e1c l\u1eafp \u0111\u1eb7t ho\u1eb7c s\u1eeda ch\u1eefa.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch l\u1ef1a ch\u1ecdn \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m ph\u00f9 h\u1ee3p m\u1ed9t c\u00e1ch c\u00f3 h\u1ec7 th\u1ed1ng, b\u1ea1n s\u1ebd \u0111\u1ea3m b\u1ea3o r\u1eb1ng qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m v\u1eeba mang l\u1ea1i k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c v\u1eeba an to\u00e0n cho thi\u1ebft b\u1ecb. \u0110i\u1ec1u n\u00e0y gi\u00fap \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 c\u00e2n b\u1eb1ng h\u1ee3p l\u00fd, cung c\u1ea5p \u0111\u1ee7 \u0111i\u1ec7n \u00e1p \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 ch\u00ednh x\u00e1c t\u00ecnh tr\u1ea1ng c\u00e1ch \u0111i\u1ec7n m\u00e0 kh\u00f4ng l\u00e0m thi\u1ebft b\u1ecb v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n ch\u1ecbu \u0111\u1ef1ng c\u1ee7a n\u00f3.<\/p>\n<h2 id=\"step-4-mastering-the-connections-the-role-of-test-leads\">B\u01b0\u1edbc 4: N\u1eafm v\u1eefng c\u00e1c k\u1ebft n\u1ed1i \u2013 Vai tr\u00f2 c\u1ee7a d\u00e2y d\u1eabn th\u1eed nghi\u1ec7m<\/h2>\n<p>K\u1ebft qu\u1ea3 ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n th\u00e0nh c\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c k\u1ebft n\u1ed1i ch\u00ednh x\u00e1c gi\u1eefa m\u00e1y \u0111o \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n v\u00e0 thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c ki\u1ec3m tra. Vi\u1ec7c \u0111\u1eb7t sai d\u00e2y \u0111o c\u00f3 th\u1ec3 l\u00e0m cho k\u1ebft qu\u1ea3 kh\u00f4ng ch\u00ednh x\u00e1c, d\u1eabn \u0111\u1ebfn c\u1ea3m gi\u00e1c an to\u00e0n gi\u1ea3 t\u1ea1o ho\u1eb7c b\u00e1o \u0111\u1ed9ng sai. H\u1ea7u h\u1ebft c\u00e1c m\u00e1y \u0111o \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n hi\u1ec7n \u0111\u1ea1i \u0111\u1ec1u \u0111\u01b0\u1ee3c trang b\u1ecb ba d\u00e2y \u0111o, v\u00e0 vi\u1ec7c hi\u1ec3u r\u00f5 ch\u1ee9c n\u0103ng c\u1ee7a t\u1eebng d\u00e2y l\u00e0 \u0111i\u1ec1u r\u1ea5t quan tr\u1ecdng.<\/p>\n<h3 id=\"the-three-key-terminals\">Ba nh\u00e0 ga ch\u00ednh<\/h3>\n<ol>\n<li>\n<p><strong>LINE (ho\u1eb7c L, +):<\/strong> \u0110\u00e2y l\u00e0 d\u00e2y d\u1eabn cung c\u1ea5p \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m m\u1ed9t chi\u1ec1u. D\u00e2y n\u00e0y \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi d\u00e2y d\u1eabn ho\u1eb7c ph\u1ea7n cu\u1ed9n d\u00e2y m\u00e0 b\u1ea1n mu\u1ed1n ki\u1ec3m tra l\u1edbp c\u00e1ch \u0111i\u1ec7n. \u0110\u00e2y l\u00e0 d\u00e2y \"n\u00f3ng\" hay d\u00e2y d\u01b0\u01a1ng.<\/p>\n<\/li>\n<li>\n<p><strong>TR\u00c1I \u0110\u1ea4T (ho\u1eb7c E, -):<\/strong> D\u00e2y d\u1eabn n\u00e0y ho\u00e0n th\u00e0nh m\u1ea1ch \u0111i\u1ec7n. N\u00f3 \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi \u0111i\u1ec3m tham chi\u1ebfu \u0111\u1ea5t c\u1ee7a thi\u1ebft b\u1ecb. D\u00f2ng r\u00f2 \u0111i qua l\u1edbp c\u00e1ch \u0111i\u1ec7n t\u1eeb d\u00e2y d\u1eabn s\u1ebd ch\u1ea3y xu\u1ed1ng \u0111\u1ea5t v\u00e0 \u0111\u01b0\u1ee3c thu th\u1eadp b\u1edfi d\u00e2y d\u1eabn n\u00e0y \u0111\u1ec3 thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng. \u0110\u00e2y l\u00e0 d\u00e2y d\u1eabn \"tr\u1edf v\u1ec1\" hay d\u00e2y d\u1eabn \u00e2m.<\/p>\n<\/li>\n<li>\n<p><strong>H\u1eadu v\u1ec7 (ho\u1eb7c G):<\/strong> \u0110\u00e2y l\u00e0 \u0111\u1ea7u n\u1ed1i chuy\u00ean d\u1ee5ng gi\u00fap ph\u00e2n bi\u1ec7t m\u1ed9t m\u00e1y \u0111o megohm cao c\u1ea5p v\u1edbi m\u1ed9t m\u00e1y \u0111o ohm th\u00f4ng th\u01b0\u1eddng. Ch\u1ee9c n\u0103ng c\u1ee7a n\u00f3 l\u00e0 c\u00e1ch ly linh ki\u1ec7n c\u1ea7n ki\u1ec3m tra b\u1eb1ng c\u00e1ch \"b\u1ea3o v\u1ec7\" linh ki\u1ec7n \u0111\u00f3 kh\u1ecfi \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng r\u00f2 r\u1ec9 song song kh\u00e1c. Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp \u1edf B\u01b0\u1edbc 2, d\u00f2ng r\u00f2 b\u1ec1 m\u1eb7t qua c\u00e1c ch\u1ea5t c\u00e1ch \u0111i\u1ec7n b\u1ecb \u00f4 nhi\u1ec5m c\u00f3 th\u1ec3 l\u00e0m sai l\u1ec7ch \u0111\u00e1ng k\u1ec3 k\u1ebft qu\u1ea3 \u0111o. \u0110\u1ea7u n\u1ed1i b\u1ea3o v\u1ec7 ch\u00ednh l\u00e0 gi\u1ea3i ph\u00e1p cho v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n<\/li>\n<\/ol>\n<h3 id=\"the-power-of-the-guard-terminal\">S\u1ee9c m\u1ea1nh c\u1ee7a thi\u1ebft b\u1ecb \u0111\u1ea7u cu\u1ed1i b\u1ea3o v\u1ec7<\/h3>\n<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea1n \u0111ang ki\u1ec3m tra \u0111\u1ed9 c\u00e1ch \u0111i\u1ec7n c\u1ee7a d\u00e2y d\u1eabn c\u00e1p so v\u1edbi v\u1ecf b\u1ecdc kim lo\u1ea1i (\u0111\u1ea5t) c\u1ee7a n\u00f3. Tuy nhi\u00ean, kh\u1ed1i \u0111\u1ea7u n\u1ed1i n\u01a1i b\u1ea1n th\u1ef1c hi\u1ec7n c\u00e1c k\u1ebft n\u1ed1i l\u1ea1i b\u1ecb ph\u1ee7 m\u1ed9t l\u1edbp b\u1ee5i d\u1ea7u. Khi b\u1ea1n \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m, d\u00f2ng \u0111i\u1ec7n s\u1ebd r\u00f2 r\u1ec9 qua l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a c\u00e1p sang v\u1ecf b\u1ecdc (\u0111\u00e2y ch\u00ednh l\u00e0 \u0111i\u1ec1u b\u1ea1n mu\u1ed1n \u0111o), nh\u01b0ng c\u0169ng s\u1ebd t\u1ed3n t\u1ea1i m\u1ed9t \u0111\u01b0\u1eddng d\u1eabn d\u00f2ng \u0111i\u1ec7n kh\u00e1c tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a kh\u1ed1i \u0111\u1ea7u n\u1ed1i b\u1ea9n. M\u00e1y \u0111o s\u1ebd \u0111o t\u1ed5ng c\u1ee7a c\u1ea3 hai d\u00f2ng \u0111i\u1ec7n, d\u1eabn \u0111\u1ebfn gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf t\u00ednh to\u00e1n \u0111\u01b0\u1ee3c s\u1ebd th\u1ea5p m\u1ed9t c\u00e1ch gi\u1ea3 t\u1ea1o.<\/p>\n<p>B\u1eb1ng c\u00e1ch n\u1ed1i d\u00e2y d\u1eabn b\u1ea3o v\u1ec7 v\u00e0o b\u1ec1 m\u1eb7t c\u1ee7a kh\u1ed1i \u0111\u1ea7u n\u1ed1i (th\u01b0\u1eddng b\u1eb1ng c\u00e1ch qu\u1ea5n m\u1ed9t s\u1ee3i d\u00e2y tr\u1ea7n quanh l\u1edbp c\u00e1ch \u0111i\u1ec7n gi\u1eefa c\u00e1c \u0111i\u1ec3m n\u1ed1i D\u00f2ng \u0111i\u1ec7n v\u00e0 \u0110\u1ea5t), b\u1ea1n s\u1ebd ch\u1eb7n d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 b\u1ec1 m\u1eb7t n\u00e0y. M\u1ea1ch b\u1ea3o v\u1ec7 d\u1eabn d\u00f2ng \u0111i\u1ec7n n\u00e0y tr\u1edf l\u1ea1i ngu\u1ed3n \u0111i\u1ec7n c\u1ee7a m\u00e1y \u0111o \u0111i\u1ec7n tr\u1edf, b\u1ecf qua m\u1ea1ch \u0111o. Tr\u00ean th\u1ef1c t\u1ebf, m\u00e1y \u0111o s\u1ebd kh\u00f4ng nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c r\u00f2 r\u1ec9 b\u1ec1 m\u1eb7t v\u00e0 ch\u1ec9 s\u1ed1 hi\u1ec3n th\u1ecb ch\u1ec9 l\u00e0 d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 th\u1ef1c s\u1ef1 ch\u1ea1y qua l\u1edbp c\u00e1ch \u0111i\u1ec7n ch\u00ednh c\u1ee7a c\u00e1p. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea1n \u0111o l\u01b0\u1eddng t\u00ecnh tr\u1ea1ng th\u1ef1c s\u1ef1 c\u1ee7a l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u00e1p, ngay c\u1ea3 trong \u0111i\u1ec1u ki\u1ec7n th\u1ef1c t\u1ebf kh\u00f4ng l\u00fd t\u01b0\u1edfng.<\/p>\n<h3 id=\"common-connection-scenarios\">C\u00e1c t\u00ecnh hu\u1ed1ng k\u1ebft n\u1ed1i ph\u1ed5 bi\u1ebfn<\/h3>\n<p>C\u00e1c \u0111i\u1ec3m k\u1ebft n\u1ed1i c\u1ee5 th\u1ec3 s\u1ebd kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c ki\u1ec3m tra.<\/p>\n<ul>\n<li>\n<p><strong>Cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1 ho\u1eb7c m\u00e1y ph\u00e1t \u0111i\u1ec7n:<\/strong><\/p>\n<ul>\n<li><strong>Th\u1eed nghi\u1ec7m c\u00e1ch \u0111i\u1ec7n pha-\u0111\u1ea5t:<\/strong> N\u1ed1i d\u00e2y LINE v\u00e0o m\u1ed9t trong c\u00e1c c\u1ef1c c\u1ee7a \u0111\u1ed9ng c\u01a1 (v\u00ed d\u1ee5: U ho\u1eb7c T1). N\u1ed1i hai pha c\u00f2n l\u1ea1i (V, W ho\u1eb7c T2, T3) v\u00e0o d\u00e2y LINE, \u0111\u1ec3 t\u1ea5t c\u1ea3 c\u00e1c cu\u1ed9n d\u00e2y \u0111\u01b0\u1ee3c ki\u1ec3m tra c\u00f9ng l\u00fac. N\u1ed1i d\u00e2y EARTH v\u00e0o khung \u0111\u1ed9ng c\u01a1 ho\u1eb7c khung g\u1ea7m (m\u1ed9t b\u1ec1 m\u1eb7t kim lo\u1ea1i s\u1ea1ch, kh\u00f4ng s\u01a1n). D\u00e2y GUARD th\u01b0\u1eddng kh\u00f4ng c\u1ea7n thi\u1ebft tr\u1eeb khi kh\u1ed1i \u0111\u1ea7u n\u1ed1i b\u1ecb \u00f4 nhi\u1ec5m n\u1eb7ng. \u0110\u00e2y l\u00e0 th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean \u0111\u1ed9ng c\u01a1.<\/li>\n<li><strong>Ki\u1ec3m tra gi\u1eefa c\u00e1c pha:<\/strong> C\u00e1ch ly c\u00e1c cu\u1ed9n d\u00e2y v\u1edbi nhau. N\u1ed1i d\u00e2y LINE v\u00e0o m\u1ed9t pha (v\u00ed d\u1ee5: U) v\u00e0 d\u00e2y EARTH v\u00e0o m\u1ed9t pha kh\u00e1c (v\u00ed d\u1ee5: V). Khung \u0111\u1ed9ng c\u01a1 ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1ec3 \u1edf tr\u1ea1ng th\u00e1i n\u1ed5i (kh\u00f4ng n\u1ed1i). Th\u1eed nghi\u1ec7m n\u00e0y nh\u1eb1m ki\u1ec3m tra hi\u1ec7n t\u01b0\u1ee3ng h\u1ecfng c\u00e1ch \u0111i\u1ec7n gi\u1eefa c\u00e1c cu\u1ed9n d\u00e2y.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Cu\u1ed9n d\u00e2y m\u00e1y bi\u1ebfn \u00e1p:<\/strong><\/p>\n<ul>\n<li><strong>Cu\u1ed9n d\u00e2y ph\u00eda tr\u00ean n\u1ed1i \u0111\u1ea5t:<\/strong> N\u1ed1i d\u00e2y LINE v\u00e0o c\u00e1c c\u1ef1c cao \u00e1p (\u0111\u01b0\u1ee3c n\u1ed1i ng\u1eafn v\u1edbi nhau). N\u1ed1i d\u00e2y EARTH v\u00e0o th\u00f9ng bi\u1ebfn \u00e1p (n\u1ed1i \u0111\u1ea5t). Trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m n\u00e0y, c\u00e1c cu\u1ed9n d\u00e2y th\u1ea5p \u00e1p c\u0169ng c\u1ea7n \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t \u0111\u1ec3 ng\u0103n ng\u1eeba hi\u1ec7n t\u01b0\u1ee3ng \u0111i\u1ec7n \u00e1p c\u1ea3m \u1ee9ng.<\/li>\n<li><strong>Cu\u1ed9n d\u00e2y t\u1eeb ph\u00eda cao sang ph\u00eda th\u1ea5p:<\/strong> N\u1ed1i d\u00e2y LINE v\u00e0o c\u00e1c c\u1ef1c cao \u00e1p (\u0111\u01b0\u1ee3c n\u1ed1i ng\u1eafn v\u1edbi nhau). N\u1ed1i d\u00e2y EARTH v\u00e0o c\u00e1c c\u1ef1c th\u1ea5p \u00e1p (\u0111\u01b0\u1ee3c n\u1ed1i ng\u1eafn v\u1edbi nhau). N\u1ed1i d\u00e2y GUARD v\u00e0o th\u00f9ng bi\u1ebfn \u00e1p (\u0111\u1ea5t) \u0111\u1ec3 lo\u1ea1i b\u1ecf hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 b\u1ec1 m\u1eb7t qua c\u00e1c \u1ed1ng l\u00f3t.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>D\u00e2y ngu\u1ed3n:<\/strong><\/p>\n<ul>\n<li><strong>\u0110i\u1ec7n tr\u1edf gi\u1eefa d\u00e2y d\u1eabn v\u00e0 m\u1eb7t \u0111\u1ea5t\/l\u1edbp ch\u1eafn:<\/strong> N\u1ed1i d\u00e2y LINE v\u1edbi d\u00e2y d\u1eabn c\u1ee7a c\u00e1p. N\u1ed1i d\u00e2y EARTH v\u1edbi l\u1edbp v\u1ecf kim lo\u1ea1i c\u1ee7a c\u00e1p ho\u1eb7c \u1ed1ng d\u1eabn. N\u1ebfu ki\u1ec3m tra c\u00e1p nhi\u1ec1u d\u00e2y d\u1eabn, c\u00e1c d\u00e2y d\u1eabn c\u00f2n l\u1ea1i c\u0169ng ph\u1ea3i \u0111\u01b0\u1ee3c n\u1ed1i \u0111\u1ea5t.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>K\u1ef9 thu\u1eadt k\u1ebft n\u1ed1i \u0111\u00fang c\u00e1ch l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng \u0111\u01b0\u1ee3c r\u00e8n luy\u1ec7n qua th\u1ef1c h\u00e0nh. H\u00e3y lu\u00f4n d\u00e0nh m\u1ed9t ch\u00fat th\u1eddi gian \u0111\u1ec3 h\u00ecnh dung \u0111\u01b0\u1eddng \u0111i d\u1ef1 ki\u1ebfn c\u1ee7a d\u00f2ng \u0111i\u1ec7n v\u00e0 b\u1ea5t k\u1ef3 \u0111\u01b0\u1eddng \u0111i kh\u00f4ng mong mu\u1ed1n n\u00e0o tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u th\u1eed nghi\u1ec7m. B\u00e0i t\u1eadp t\u01b0 duy n\u00e0y s\u1ebd \u0111\u1ea3m b\u1ea3o c\u00e1c \u0111\u1ea7u n\u1ed1i c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c \u0111\u1eb7t \u0111\u00fang v\u1ecb tr\u00ed \u0111\u1ec3 thu \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c.<\/p>\n<h2 id=\"step-5-executing-the-insulation-resistance-test-protocols\">B\u01b0\u1edbc 5: Th\u1ef1c hi\u1ec7n c\u00e1c quy tr\u00ecnh ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n<\/h2>\n<p>Khi thi\u1ebft b\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c chu\u1ea9n b\u1ecb \u0111\u1ea7y \u0111\u1ee7 v\u00e0 c\u00e1c d\u00e2y d\u1eabn \u0111\u00e3 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i ch\u00ednh x\u00e1c, b\u1ea1n \u0111\u00e3 s\u1eb5n s\u00e0ng ti\u1ebfn h\u00e0nh ki\u1ec3m tra th\u1ef1c t\u1ebf. Kh\u00f4ng ch\u1ec9 c\u00f3 m\u1ed9t c\u00e1ch duy nh\u1ea5t \u0111\u1ec3 th\u1ef1c hi\u1ec7n ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n; thay v\u00e0o \u0111\u00f3, c\u00f3 m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p ri\u00eang bi\u1ec7t, m\u1ed7i ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c \u0111\u1eb7c t\u00ednh kh\u00e1c nhau c\u1ee7a l\u1edbp c\u00e1ch \u0111i\u1ec7n. Ph\u01b0\u01a1ng ph\u00e1p b\u1ea1n ch\u1ecdn s\u1ebd ph\u1ee5 thu\u1ed9c v\u00e0o lo\u1ea1i thi\u1ebft b\u1ecb, th\u1eddi gian c\u00f3 s\u1eb5n v\u00e0 m\u1ee9c \u0111\u1ed9 chi ti\u1ebft c\u1ea7n thi\u1ebft c\u1ee7a qu\u00e1 tr\u00ecnh ch\u1ea9n \u0111o\u00e1n.<\/p>\n<h3 id=\"method-1-the-spot-reading-test-short-time-reading\">Ph\u01b0\u01a1ng ph\u00e1p 1: B\u00e0i ki\u1ec3m tra \u0111\u1ecdc nhanh (\u0110\u1ecdc trong th\u1eddi gian ng\u1eafn)<\/h3>\n<p>\u0110\u00e2y l\u00e0 h\u00ecnh th\u1ee9c c\u01a1 b\u1ea3n nh\u1ea5t c\u1ee7a ph\u00e9p th\u1eed. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y bao g\u1ed3m vi\u1ec7c \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m trong m\u1ed9t kho\u1ea3ng th\u1eddi gian c\u1ed1 \u0111\u1ecbnh, th\u01b0\u1eddng l\u00e0 60 gi\u00e2y, v\u00e0 ghi l\u1ea1i gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf t\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3.<\/p>\n<ul>\n<li><strong>Quy tr\u00ecnh:<\/strong> Ch\u1ecdn m\u1ee9c \u0111i\u1ec7n \u00e1p th\u00edch h\u1ee3p, nh\u1ea5n n\u00fat \"Test\" v\u00e0 gi\u1eef nguy\u00ean trong 60 gi\u00e2y. Gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf c\u00f3 th\u1ec3 s\u1ebd t\u0103ng l\u00ean trong kho\u1ea3ng th\u1eddi gian n\u00e0y khi d\u00f2ng \u0111i\u1ec7n dung v\u00e0 d\u00f2ng \u0111i\u1ec7n h\u1ea5p th\u1ee5 gi\u1ea3m d\u1ea7n. Gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c ghi l\u1ea1i t\u1ea1i th\u1eddi \u0111i\u1ec3m 60 gi\u00e2y ch\u00ednh l\u00e0 gi\u00e1 tr\u1ecb \u0111o t\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3.<\/li>\n<li><strong>\u1ee8ng d\u1ee5ng:<\/strong> Th\u1eed nghi\u1ec7m n\u00e0y r\u1ea5t h\u1eefu \u00edch \u0111\u1ec3 ki\u1ec3m tra nhanh ho\u1eb7c \u0111\u1ec3 ki\u1ec3m tra c\u00e1c thi\u1ebft b\u1ecb c\u00f3 \u0111i\u1ec7n dung r\u1ea5t th\u1ea5p, n\u01a1i d\u00f2ng \u0111i\u1ec7n s\u1ea1c suy gi\u1ea3m g\u1ea7n nh\u01b0 ngay l\u1eadp t\u1ee9c. N\u00f3 c\u0169ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m c\u01a1 s\u1edf cho c\u00e1c th\u1eed nghi\u1ec7m c\u00f3 th\u1eddi gian \u0111\u1ecbnh tr\u01b0\u1edbc ph\u1ee9c t\u1ea1p h\u01a1n.<\/li>\n<li><strong>Gi\u1edbi h\u1ea1n:<\/strong> K\u1ebft qu\u1ea3 \u0111o t\u1ea1i m\u1ed9t \u0111i\u1ec3m c\u1ee5 th\u1ec3 ch\u1ecbu \u1ea3nh h\u01b0\u1edfng r\u1ea5t l\u1edbn t\u1eeb nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ea9m. N\u1ebfu kh\u00f4ng c\u00f3 d\u1eef li\u1ec7u so s\u00e1nh t\u1eeb c\u00e1c l\u1ea7n ki\u1ec3m tra tr\u01b0\u1edbc \u0111\u00f3 tr\u00ean c\u00f9ng m\u1ed9t m\u00e1y trong \u0111i\u1ec1u ki\u1ec7n t\u01b0\u01a1ng t\u1ef1, gi\u00e1 tr\u1ecb \u0111o \u0111\u01a1n l\u1ebb n\u00e0y s\u1ebd c\u00f3 gi\u00e1 tr\u1ecb ch\u1ea9n \u0111o\u00e1n h\u1ea1n ch\u1ebf. Gi\u00e1 tr\u1ecb 500 M\u03a9 c\u00f3 th\u1ec3 l\u00e0 k\u1ebft qu\u1ea3 r\u1ea5t t\u1ed1t \u0111\u1ed1i v\u1edbi m\u1ed9t \u0111\u1ed9ng c\u01a1, nh\u01b0ng l\u1ea1i l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a s\u1ef1 c\u1ed1 s\u1eafp x\u1ea3y ra \u0111\u1ed1i v\u1edbi m\u1ed9t \u0111\u1ed9ng c\u01a1 kh\u00e1c v\u1ed1n th\u01b0\u1eddng c\u00f3 gi\u00e1 tr\u1ecb \u0111o tr\u00ean 2000 M\u03a9. Gi\u00e1 tr\u1ecb ch\u00ednh c\u1ee7a n\u00f3 n\u1eb1m \u1edf vi\u1ec7c ph\u00e2n t\u00edch xu h\u01b0\u1edbng theo th\u1eddi gian.<\/li>\n<\/ul>\n<h3 id=\"method-2-the-time-resistance-method-dielectric-absorption-ratio-dar\">Ph\u01b0\u01a1ng ph\u00e1p 2: Ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec7n tr\u1edf theo th\u1eddi gian (H\u1ec7 s\u1ed1 h\u1ea5p th\u1ee5 \u0111i\u1ec7n m\u00f4i \u2013 DAR)<\/h3>\n<p>Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y t\u1eadn d\u1ee5ng th\u1ef1c t\u1ebf l\u00e0 d\u00f2ng \u0111i\u1ec7n h\u1ea5p th\u1ee5 trong v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n t\u1ed1t s\u1ebd gi\u1ea3m d\u1ea7n theo th\u1eddi gian, khi\u1ebfn gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf \u0111o \u0111\u01b0\u1ee3c t\u0103ng l\u00ean. Th\u1eed nghi\u1ec7m n\u00e0y so s\u00e1nh gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf \u0111o \u0111\u01b0\u1ee3c sau 60 gi\u00e2y v\u1edbi gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c sau 30 gi\u00e2y.<\/p>\n<ul>\n<li><strong>Quy tr\u00ecnh:<\/strong> \u00c1p d\u1ee5ng \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m v\u00e0 ghi l\u1ea1i gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf sau 30 gi\u00e2y v\u00e0 sau \u0111\u00f3 l\u00e0 sau 60 gi\u00e2y.<\/li>\n<li><strong>C\u00e1ch t\u00ednh:<\/strong> DAR = Kh\u00e1ng c\u1ef1 t\u1ea1i m\u1ed1c 60 gi\u00e2y \/ Kh\u00e1ng c\u1ef1 t\u1ea1i m\u1ed1c 30 gi\u00e2y.<\/li>\n<li><strong>Gi\u1ea3i th\u00edch:<\/strong> V\u00ec \u0111\u00e2y l\u00e0 m\u1ed9t t\u1ef7 l\u1ec7, n\u00ean n\u00f3 h\u1ea7u nh\u01b0 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec7t \u0111\u1ed9 v\u00e0 k\u00edch th\u01b0\u1edbc thi\u1ebft b\u1ecb.\n<ul>\n<li><strong>C\u00e1ch nhi\u1ec7t t\u1ed1t:<\/strong> D\u00f2ng \u0111i\u1ec7n h\u1ea5p th\u1ee5 s\u1ebd xu\u1ea5t hi\u1ec7n v\u00e0 gi\u1ea3m d\u1ea7n, khi\u1ebfn \u0111i\u1ec7n tr\u1edf t\u0103ng l\u00ean r\u00f5 r\u1ec7t. T\u1ef7 l\u1ec7 h\u1ea5p th\u1ee5 d\u00f2ng \u0111i\u1ec7n (DAR) s\u1ebd l\u1edbn h\u01a1n 1,25.<\/li>\n<li><strong>C\u00e1ch nhi\u1ec7t k\u00e9m:<\/strong> N\u1ebfu l\u1edbp c\u00e1ch \u0111i\u1ec7n b\u1ecb \u1ea9m \u01b0\u1edbt ho\u1eb7c b\u1ecb \u00f4 nhi\u1ec5m, d\u00f2ng r\u00f2 cao s\u1ebd chi ph\u1ed1i k\u1ebft qu\u1ea3 \u0111o ngay t\u1eeb \u0111\u1ea7u. D\u00f2ng r\u00f2 n\u00e0y l\u00e0 h\u1eb1ng s\u1ed1 v\u00e0 kh\u00f4ng suy gi\u1ea3m. Do \u0111\u00f3, \u0111i\u1ec7n tr\u1edf s\u1ebd kh\u00f4ng t\u0103ng nhi\u1ec1u, v\u00e0 t\u1ef7 s\u1ed1 DAR s\u1ebd g\u1ea7n b\u1eb1ng 1,0.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<table class=\"mce-item-table\" style=\"width:100%; border-collapse: collapse;\" border=\"1\">\n<thead>\n<tr>\n<th style=\"text-align:left;\">Gi\u00e1 tr\u1ecb DAR<\/th>\n<th style=\"text-align:left;\">T\u00ecnh tr\u1ea1ng l\u1edbp c\u00e1ch nhi\u1ec7t<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;\">D\u01b0\u1edbi 1,0<\/td>\n<td style=\"text-align:left;\">X\u1ea5u<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">1,0 \u0111\u1ebfn 1,25<\/td>\n<td style=\"text-align:left;\">C\u00f3 v\u1ea5n \u0111\u1ec1<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">L\u1edbn h\u01a1n 1,25<\/td>\n<td style=\"text-align:left;\">T\u1ed1t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"method-3-the-polarization-index-pi-test\">Ph\u01b0\u01a1ng ph\u00e1p 3: Th\u1eed nghi\u1ec7m ch\u1ec9 s\u1ed1 ph\u00e2n c\u1ef1c (PI)<\/h3>\n<p>Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m PI l\u00e0 m\u1ed9t bi\u1ebfn th\u1ec3 c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p th\u1eddi gian-\u0111i\u1ec7n tr\u1edf v\u00e0 \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t trong nh\u1eefng c\u00f4ng c\u1ee5 ch\u1ea9n \u0111o\u00e1n m\u1ea1nh m\u1ebd v\u00e0 \u0111\u00e1ng tin c\u1eady nh\u1ea5t \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 t\u00ecnh tr\u1ea1ng k\u1ef9 thu\u1eadt c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb quay (\u0111\u1ed9ng c\u01a1, m\u00e1y ph\u00e1t \u0111i\u1ec7n) v\u00e0 m\u00e1y bi\u1ebfn \u00e1p c\u00f4ng su\u1ea5t l\u1edbn. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y so s\u00e1nh gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c sau 10 ph\u00fat v\u1edbi gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c sau 1 ph\u00fat.<\/p>\n<ul>\n<li><strong>Quy tr\u00ecnh:<\/strong> \u00c1p d\u1ee5ng \u0111i\u1ec7n \u00e1p th\u1eed \u0111\u00e3 ch\u1ecdn li\u00ean t\u1ee5c trong 10 ph\u00fat. Ghi l\u1ea1i gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf t\u1ea1i th\u1eddi \u0111i\u1ec3m 1 ph\u00fat v\u00e0 m\u1ed9t l\u1ea7n n\u1eefa t\u1ea1i th\u1eddi \u0111i\u1ec3m 10 ph\u00fat. H\u1ea7u h\u1ebft c\u00e1c m\u00e1y \u0111o megohm k\u1ef9 thu\u1eadt s\u1ed1 hi\u1ec7n \u0111\u1ea1i s\u1ebd t\u1ef1 \u0111\u1ed9ng th\u1ef1c hi\u1ec7n th\u1eed nghi\u1ec7m n\u00e0y v\u00e0 t\u00ednh to\u00e1n t\u1ef7 l\u1ec7 cho b\u1ea1n.<\/li>\n<li><strong>C\u00e1ch t\u00ednh:<\/strong> PI = Kh\u00e1ng c\u1ef1 t\u1ea1i m\u1ed1c 10 ph\u00fat \/ Kh\u00e1ng c\u1ef1 t\u1ea1i m\u1ed1c 1 ph\u00fat.<\/li>\n<li><strong>Gi\u1ea3i th\u00edch:<\/strong> Th\u1eddi gian 10 ph\u00fat n\u00e0y t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho qu\u00e1 tr\u00ecnh h\u1ea5p th\u1ee5 \u0111i\u1ec7n m\u00f4i di\u1ec5n ra t\u1eeb t\u1eeb c\u00f3 \u0111\u1ee7 th\u1eddi gian \u0111\u1ec3 ho\u00e0n t\u1ea5t.\n<ul>\n<li><strong>V\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t t\u1ed1t, kh\u00f4 r\u00e1o:<\/strong> \u0110i\u1ec7n tr\u1edf s\u1ebd ti\u1ebfp t\u1ee5c t\u0103ng trong su\u1ed1t 10 ph\u00fat khi d\u00f2ng \u0111i\u1ec7n h\u1ea5p th\u1ee5 gi\u1ea3m d\u1ea7n, d\u1eabn \u0111\u1ebfn t\u1ef7 s\u1ed1 PI cao.<\/li>\n<li><strong>V\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t \u1ea9m \u01b0\u1edbt, b\u1ecb \u00f4 nhi\u1ec5m:<\/strong> D\u00f2ng r\u00f2 cao v\u00e0 \u1ed5n \u0111\u1ecbnh s\u1ebd che l\u1ea5p hi\u1ec7u \u1ee9ng h\u1ea5p th\u1ee5. \u0110i\u1ec7n tr\u1edf s\u1ebd th\u1ea5p v\u00e0 nhanh ch\u00f3ng \u1ed5n \u0111\u1ecbnh \u1edf m\u1ee9c b\u1eb1ng ph\u1eb3ng, d\u1eabn \u0111\u1ebfn h\u1ec7 s\u1ed1 PI g\u1ea7n b\u1eb1ng 1,0. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y d\u00f2ng r\u00f2 l\u00e0 y\u1ebfu t\u1ed1 chi ph\u1ed1i, \u0111\u00e2y l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a s\u1ef1 c\u1ed1.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Ti\u00eau chu\u1ea9n IEEE 43 \u0111\u01b0a ra c\u00e1c gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho Ch\u1ec9 s\u1ed1 ph\u00e2n c\u1ef1c.<\/p>\n<table class=\"mce-item-table\" style=\"width:100%; border-collapse: collapse;\" border=\"1\">\n<thead>\n<tr>\n<th style=\"text-align:left;\">Gi\u00e1 tr\u1ecb PI theo ti\u00eau chu\u1ea9n IEEE 43-2000<\/th>\n<th style=\"text-align:left;\">T\u00ecnh tr\u1ea1ng l\u1edbp c\u00e1ch nhi\u1ec7t<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;\">D\u01b0\u1edbi 2,0<\/td>\n<td style=\"text-align:left;\">Nguy hi\u1ec3m<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">2,0 \u0111\u1ebfn 4,0<\/td>\n<td style=\"text-align:left;\">T\u1ed1t<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">L\u1edbn h\u01a1n 4,0<\/td>\n<td style=\"text-align:left;\">Tuy\u1ec7t v\u1eddi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"method-4-the-step-voltage-test\">Ph\u01b0\u01a1ng ph\u00e1p 4: Ki\u1ec3m tra \u0111i\u1ec7n \u00e1p t\u1eebng b\u01b0\u1edbc<\/h3>\n<p>Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m n\u00e0y \u0111\u1eb7c bi\u1ec7t h\u1eefu \u00edch trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c v\u1ecb tr\u00ed h\u01b0 h\u1ecfng ho\u1eb7c \u00f4 nhi\u1ec5m c\u1ee5c b\u1ed9. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y bao g\u1ed3m vi\u1ec7c \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m theo c\u00e1c b\u01b0\u1edbc ri\u00eang bi\u1ec7t v\u00e0 quan s\u00e1t s\u1ef1 thay \u0111\u1ed5i c\u1ee7a \u0111i\u1ec7n tr\u1edf.<\/p>\n<ul>\n<li><strong>Quy tr\u00ecnh:<\/strong> Th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong n\u0103m giai \u0111o\u1ea1n th\u1eddi gian b\u1eb1ng nhau (v\u00ed d\u1ee5: m\u1ed7i giai \u0111o\u1ea1n 1 ph\u00fat). Trong ph\u00fat \u0111\u1ea7u ti\u00ean, \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p th\u1ea5p (v\u00ed d\u1ee5: 500V). Trong ph\u00fat th\u1ee9 hai, \u0111i\u1ec7n \u00e1p \u0111\u01b0\u1ee3c t\u0103ng d\u1ea7n (v\u00ed d\u1ee5: l\u00ean 1000V), v\u00e0 c\u1ee9 th\u1ebf ti\u1ebfp t\u1ee5c cho \u0111\u1ebfn khi \u0111\u1ea1t \u0111\u1ebfn \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m cu\u1ed1i c\u00f9ng. \u0110i\u1ec7n tr\u1edf \u0111\u01b0\u1ee3c ghi l\u1ea1i v\u00e0o cu\u1ed1i m\u1ed7i giai \u0111o\u1ea1n.<\/li>\n<li><strong>Gi\u1ea3i th\u00edch:<\/strong> Trong v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n kh\u1ecfe m\u1ea1nh v\u00e0 \u0111\u1ed3ng nh\u1ea5t, gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf n\u00ean duy tr\u00ec t\u01b0\u01a1ng \u0111\u1ed1i \u1ed5n \u0111\u1ecbnh \u1edf m\u1ed7i m\u1ee9c \u0111i\u1ec7n \u00e1p (sau khi c\u00e1c t\u00e1c \u0111\u1ed9ng c\u1ee7a qu\u00e1 tr\u00ecnh s\u1ea1c ban \u0111\u1ea7u k\u1ebft th\u00fac). Tuy nhi\u00ean, n\u1ebfu c\u00f3 m\u1ed9t v\u1ebft n\u1ee9t nh\u1ecf, l\u1ed7 r\u1ed7ng ho\u1eb7c t\u00fai \u1ea9m, \u00e1p l\u1ef1c \u0111i\u1ec7n cao h\u01a1n do \u0111i\u1ec7n \u00e1p t\u0103ng c\u00f3 th\u1ec3 khi\u1ebfn v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n b\u1eaft \u0111\u1ea7u b\u1ecb ph\u00e1 v\u1ee1 v\u00e0 d\u1eabn \u0111i\u1ec7n nhi\u1ec1u h\u01a1n. N\u1ebfu \u0111i\u1ec7n tr\u1edf gi\u1ea3m \u0111\u00e1ng k\u1ec3 \u1edf m\u1ed9t trong c\u00e1c b\u01b0\u1edbc \u0111i\u1ec7n \u00e1p cao h\u01a1n, \u0111\u00f3 l\u00e0 d\u1ea5u hi\u1ec7u r\u00f5 r\u00e0ng cho th\u1ea5y c\u00f3 \u0111i\u1ec3m y\u1ebfu c\u1ee5c b\u1ed9 m\u00e0 c\u00f3 th\u1ec3 kh\u00f4ng r\u00f5 r\u00e0ng \u1edf c\u00e1c \u0111i\u1ec7n \u00e1p th\u1ea5p h\u01a1n. \u0110\u00e2y l\u00e0 d\u1ea5u hi\u1ec7u c\u1ea3nh b\u00e1o r\u1eb1ng v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng trong \u0111i\u1ec1u ki\u1ec7n qu\u00e1 \u00e1p nh\u1ea5t th\u1eddi trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh b\u00ecnh th\u01b0\u1eddng.<\/li>\n<\/ul>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn quy tr\u00ecnh ph\u00f9 h\u1ee3p t\u1eeb b\u1ed9 c\u00f4ng c\u1ee5 n\u00e0y, t\u1eeb vi\u1ec7c ki\u1ec3m tra nhanh t\u1ea1i ch\u1ed7 cho \u0111\u1ebfn ph\u00e2n t\u00edch PI ho\u1eb7c \u0111i\u1ec7n \u00e1p t\u1eebng b\u01b0\u1edbc chi ti\u1ebft, gi\u00fap c\u00e1c chuy\u00ean gia ki\u1ec3m tra c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh ph\u01b0\u01a1ng ph\u00e1p ch\u1ea9n \u0111o\u00e1n sao cho ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a thi\u1ebft b\u1ecb v\u00e0 ch\u01b0\u01a1ng tr\u00ecnh b\u1ea3o tr\u00ec.<\/p>\n<h2 id=\"step-6-the-art-of-interpretation-from-raw-data-to-actionable-insights\">B\u01b0\u1edbc 6: Ngh\u1ec7 thu\u1eadt ph\u00e2n t\u00edch \u2013 T\u1eeb d\u1eef li\u1ec7u th\u00f4 \u0111\u1ebfn nh\u1eefng th\u00f4ng tin c\u00f3 gi\u00e1 tr\u1ecb th\u1ef1c ti\u1ec5n<\/h2>\n<p>Vi\u1ec7c thu th\u1eadp d\u1eef li\u1ec7u ch\u1ec9 l\u00e0 m\u1ed9t n\u1eeda ch\u1eb7ng \u0111\u01b0\u1eddng; k\u1ef9 n\u0103ng th\u1ef1c s\u1ef1 c\u1ee7a m\u1ed9t chuy\u00ean gia b\u1ea3o tr\u00ec \u0111i\u1ec7n n\u1eb1m \u1edf vi\u1ec7c ph\u00e2n t\u00edch d\u1eef li\u1ec7u \u0111\u00f3. M\u1ed9t con s\u1ed1 hi\u1ec3n th\u1ecb tr\u00ean m\u00e0n h\u00ecnh \u2014 d\u00f9 l\u00e0 50 M\u03a9 hay 5.000 M\u03a9 \u2014 s\u1ebd kh\u00f4ng c\u00f3 \u00fd ngh\u0129a g\u00ec n\u1ebfu thi\u1ebfu b\u1ed1i c\u1ea3nh. Vi\u1ec7c ph\u00e2n t\u00edch c\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n \u0111\u00f2i h\u1ecfi ph\u1ea3i xem x\u00e9t gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i, lo\u1ea1i th\u1eed nghi\u1ec7m (DAR\/PI) v\u00e0, quan tr\u1ecdng nh\u1ea5t, xu h\u01b0\u1edbng l\u1ecbch s\u1eed.<\/p>\n<h3 id=\"evaluating-absolute-resistance-values\">\u0110\u00e1nh gi\u00e1 c\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf tuy\u1ec7t \u0111\u1ed1i<\/h3>\n<p>C\u00e1c ti\u00eau chu\u1ea9n nh\u01b0 IEEE 43 cung c\u1ea5p m\u1ee9c c\u01a1 b\u1ea3n cho c\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n t\u1ed1i thi\u1ec3u \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn. Gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c c\u1ee7a m\u00e1y. M\u1ed9t quy t\u1eafc kinh nghi\u1ec7m \u0111\u01a1n gi\u1ea3n th\u01b0\u1eddng \u0111\u01b0\u1ee3c nh\u1eafc \u0111\u1ebfn l\u00e0 \u201cQuy t\u1eafc M\u1ed9t Megohm\u201d, theo \u0111\u00f3 \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ph\u1ea3i \u0111\u1ea1t \u00edt nh\u1ea5t 1 megohm cho m\u1ed7i 1.000 volt \u0111i\u1ec7n \u00e1p l\u00e0m vi\u1ec7c, c\u1ed9ng th\u00eam m\u1ee9c c\u01a1 b\u1ea3n l\u00e0 1 megohm.<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> \u0110\u1ed1i v\u1edbi \u0111\u1ed9ng c\u01a1 4.160 V, \u0111i\u1ec7n tr\u1edf t\u1ed1i thi\u1ec3u s\u1ebd v\u00e0o kho\u1ea3ng 4,16 M\u03a9 + 1 M\u03a9 = 5,16 M\u03a9.<\/li>\n<\/ul>\n<p>Tuy nhi\u00ean, b\u1ea3n s\u1eeda \u0111\u1ed5i n\u0103m 2013 c\u1ee7a ti\u00eau chu\u1ea9n IEEE 43 \u0111\u00e3 \u0111\u01a1n gi\u1ea3n h\u00f3a quy \u0111\u1ecbnh n\u00e0y, khuy\u1ebfn ngh\u1ecb gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u l\u00e0 100 M\u03a9 \u0111\u1ed1i v\u1edbi h\u1ea7u h\u1ebft c\u00e1c cu\u1ed9n d\u00e2y c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c tr\u00ean 1 kV sau khi hi\u1ec7u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 v\u1ec1 40\u00b0C. \u0110\u1ed1i v\u1edbi c\u00e1c cu\u1ed9n d\u00e2y c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c d\u01b0\u1edbi 1 kV, gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb l\u00e0 5 M\u03a9.<\/p>\n<p>\u0110i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i hi\u1ec3u r\u1eb1ng \u0111\u00e2y ch\u1ec9 l\u00e0 c\u00e1c gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u. Ch\u00fang cho th\u1ea5y m\u1ee9c \u0111\u1ed9 m\u00e0 thi\u1ebft b\u1ecb c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra ngay l\u1eadp t\u1ee9c v\u00e0 c\u00f3 th\u1ec3 ph\u1ea3i th\u1ef1c hi\u1ec7n c\u00e1c bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c. M\u1ed9t m\u00e1y m\u00f3c ho\u1ea1t \u0111\u1ed9ng t\u1ed1t n\u00ean c\u00f3 c\u00e1c gi\u00e1 tr\u1ecb \u0111o cao h\u01a1n nhi\u1ec1u so v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u n\u00e0y, th\u01b0\u1eddng n\u1eb1m trong kho\u1ea3ng gigohm (h\u00e0ng ngh\u00ecn megohm). M\u1ed9t gi\u00e1 tr\u1ecb \u0111o 150 M\u03a9 tr\u00ean m\u1ed9t \u0111\u1ed9ng c\u01a1 m\u1edbi 5 kV c\u00f3 th\u1ec3 k\u1ef9 thu\u1eadt l\u00e0 \"cao h\u01a1n m\u1ee9c t\u1ed1i thi\u1ec3u\", nh\u01b0ng \u0111i\u1ec1u n\u00e0y s\u1ebd l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y lo ng\u1ea1i nghi\u00eam tr\u1ecdng, v\u00ec m\u1ed9t \u0111\u1ed9ng c\u01a1 m\u1edbi n\u00ean c\u00f3 gi\u00e1 tr\u1ecb \u0111o l\u00ean \u0111\u1ebfn h\u00e0ng ngh\u00ecn megohm. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fac b\u1ed1i c\u1ea3nh v\u00e0 kinh nghi\u1ec7m tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thi\u1ebfu.<\/p>\n<h3 id=\"the-power-of-ratios-dar-and-pi\">S\u1ee9c m\u1ea1nh c\u1ee7a c\u00e1c t\u1ef7 l\u1ec7 (DAR v\u00e0 PI)<\/h3>\n<p>Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp trong b\u01b0\u1edbc tr\u01b0\u1edbc, c\u00e1c t\u1ef7 l\u1ec7 DAR v\u00e0 PI r\u1ea5t h\u1eefu \u00edch v\u00ec ch\u00fang ch\u1ee7 y\u1ebfu d\u1ef1a tr\u00ean so s\u00e1nh n\u1ed9i t\u1ea1i. Ch\u00fang so s\u00e1nh h\u00e0nh vi c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch \u0111i\u1ec7n t\u1ea1i hai th\u1eddi \u0111i\u1ec3m kh\u00e1c nhau trong c\u00f9ng m\u1ed9t l\u1ea7n th\u1eed nghi\u1ec7m. \u0110i\u1ec1u n\u00e0y khi\u1ebfn ch\u00fang \u00edt b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec7t \u0111\u1ed9 v\u00e0 k\u00edch th\u01b0\u1edbc thi\u1ebft b\u1ecb h\u01a1n so v\u1edbi gi\u00e1 tr\u1ecb \u0111o t\u1ea1i m\u1ed9t \u0111i\u1ec3m c\u1ee5 th\u1ec3.<\/p>\n<ul>\n<li><strong>Ch\u1ec9 s\u1ed1 PI th\u1ea5p (v\u00ed d\u1ee5: 1,5):<\/strong> \u0110\u00e2y l\u00e0 m\u1ed9t d\u1ea5u hi\u1ec7u r\u1ea5t r\u00f5 r\u00e0ng cho th\u1ea5y c\u00f3 v\u1ea5n \u0111\u1ec1. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y d\u00f2ng r\u00f2 li\u00ean t\u1ee5c (do \u0111\u1ed9 \u1ea9m ho\u1eb7c b\u1ee5i b\u1ea9n) \u0111ang chi\u1ebfm \u01b0u th\u1ebf, l\u1ea5n \u00e1t hi\u1ec7u \u1ee9ng h\u1ea5p th\u1ee5 \u0111i\u1ec7n m\u00f4i. L\u1edbp c\u00e1ch \u0111i\u1ec7n \u0111ang ho\u1ea1t \u0111\u1ed9ng gi\u1ed1ng nh\u01b0 m\u1ed9t \u0111i\u1ec7n tr\u1edf \u0111\u01a1n thu\u1ea7n h\u01a1n l\u00e0 m\u1ed9t t\u1ee5 \u0111i\u1ec7n, \u0111\u00e2y l\u00e0 d\u1ea5u hi\u1ec7u cho th\u1ea5y n\u00f3 kh\u00f4ng c\u00f2n th\u1ef1c hi\u1ec7n ch\u1ee9c n\u0103ng c\u00e1ch \u0111i\u1ec7n m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. Thi\u1ebft b\u1ecb n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c coi l\u00e0 kh\u00f4ng \u0111\u00e1ng tin c\u1eady v\u00e0 c\u1ea7n \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o danh s\u00e1ch b\u1ea3o tr\u00ec.<\/li>\n<li><strong>Ch\u1ec9 s\u1ed1 PI cao (v\u00ed d\u1ee5: 5,0):<\/strong> \u0110i\u1ec1u n\u00e0y cho th\u1ea5y hi\u1ec7u \u1ee9ng h\u1ea5p th\u1ee5 \u0111i\u1ec7n m\u00f4i r\u1ea5t m\u1ea1nh v\u00e0 d\u00f2ng r\u00f2 r\u1ea5t nh\u1ecf. L\u1edbp c\u00e1ch \u0111i\u1ec7n s\u1ea1ch, kh\u00f4 v\u00e0 c\u00f2n nguy\u00ean v\u1eb9n.<\/li>\n<\/ul>\n<h3 id=\"the-supreme-importance-of-trending\">T\u1ea7m quan tr\u1ecdng h\u00e0ng \u0111\u1ea7u c\u1ee7a xu h\u01b0\u1edbng<\/h3>\n<p>K\u1ef9 thu\u1eadt quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 ph\u00e2n t\u00edch \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n l\u00e0 <strong>\u0111ang th\u1ecbnh h\u00e0nh<\/strong>M\u1ed9t l\u1ea7n ki\u1ec3m tra ch\u1ec9 cho b\u1ea1n th\u1ea5y m\u1ed9t kho\u1ea3nh kh\u1eafc nh\u1ea5t \u0111\u1ecbnh. M\u1ed9t chu\u1ed7i c\u00e1c l\u1ea7n ki\u1ec3m tra k\u00e9o d\u00e0i qua nhi\u1ec1u th\u00e1ng, nhi\u1ec1u n\u0103m s\u1ebd cho b\u1ea1n m\u1ed9t b\u1ee9c tranh to\u00e0n c\u1ea3nh, h\u00e9 l\u1ed9 c\u1ed1t truy\u1ec7n v\u1ec1 h\u00e0nh tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb.<\/p>\n<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea1n \u0111ang ki\u1ec3m tra m\u1ed9t \u0111\u1ed9ng c\u01a1 quan tr\u1ecdng v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb PI l\u00e0 3,5 c\u00f9ng gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf \u0111\u00e3 hi\u1ec7u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 l\u00e0 800 M\u03a9. C\u1ea3 hai gi\u00e1 tr\u1ecb n\u00e0y \u0111\u1ec1u n\u1eb1m trong ng\u01b0\u1ee1ng an to\u00e0n. B\u1ea1n c\u00f3 th\u1ec3 mu\u1ed1n ti\u1ebfp t\u1ee5c c\u00f4ng vi\u1ec7c. Nh\u01b0ng n\u1ebfu b\u1ea1n ki\u1ec3m tra l\u1ea1i h\u1ed3 s\u01a1 v\u00e0 ph\u00e1t hi\u1ec7n ra r\u1eb1ng trong n\u0103m n\u0103m qua, ch\u00ednh \u0111\u1ed9ng c\u01a1 n\u00e0y lu\u00f4n cho k\u1ebft qu\u1ea3 ki\u1ec3m tra v\u1edbi gi\u00e1 tr\u1ecb PI l\u00e0 5,0 v\u00e0 \u0111i\u1ec7n tr\u1edf l\u00e0 2.500 M\u03a9 th\u00ec sao?<\/p>\n<p>Gi\u1edd \u0111\u00e2y, t\u00ecnh h\u00ecnh \u0111\u00e3 ho\u00e0n to\u00e0n thay \u0111\u1ed5i. M\u1eb7c d\u00f9 c\u00e1c ch\u1ec9 s\u1ed1 hi\u1ec7n t\u1ea1i v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt v\u1eabn \u0111\u01b0\u1ee3c coi l\u00e0 \"t\u1ed1t\", nh\u01b0ng xu h\u01b0\u1edbng gi\u1ea3m m\u1ea1nh l\u00e0 m\u1ed9t t\u00edn hi\u1ec7u c\u1ea3nh b\u00e1o \u0111\u00e1ng lo ng\u1ea1i. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y qu\u00e1 tr\u00ecnh suy gi\u1ea3m \u0111\u00e3 b\u1eaft \u0111\u1ea7u. C\u00f3 th\u1ec3 c\u00e1c cu\u1ed9n d\u00e2y \u0111ang b\u1ecb nhi\u1ec5m d\u1ea7u, ho\u1eb7c h\u01a1i \u1ea9m \u0111ang b\u1eaft \u0111\u1ea7u x\u00e2m nh\u1eadp. Xu h\u01b0\u1edbng gi\u1ea3m n\u00e0y l\u00e0 c\u1ea3nh b\u00e1o s\u1edbm cho b\u1ea1n. N\u00f3 cho ph\u00e9p b\u1ea1n l\u00ean l\u1ecbch b\u1ea3o tr\u00ec kh\u1eafc ph\u1ee5c (nh\u01b0 l\u00e0m s\u1ea1ch v\u00e0 s\u1ea5y kh\u00f4 c\u00e1c cu\u1ed9n d\u00e2y) trong th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng theo k\u1ebf ho\u1ea1ch, thay v\u00ec ch\u1edd \u0111\u1ee3i l\u1edbp c\u00e1ch \u0111i\u1ec7n b\u1ecb h\u1ecfng nghi\u00eam tr\u1ecdng trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t.<\/p>\n<p>\u0110\u00e2y ch\u00ednh l\u00e0 b\u1ea3n ch\u1ea5t c\u1ee7a b\u1ea3o tr\u00ec d\u1ef1 \u0111o\u00e1n. B\u1ea1n kh\u00f4ng ng\u1ed3i ch\u1edd s\u1ef1 c\u1ed1 x\u1ea3y ra; thay v\u00e0o \u0111\u00f3, b\u1ea1n s\u1eed d\u1ee5ng c\u00e1c xu h\u01b0\u1edbng d\u1eef li\u1ec7u \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n v\u00e0 ng\u0103n ch\u1eb7n n\u00f3. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao vi\u1ec7c ghi ch\u00e9p c\u1ea9n th\u1eadn, nh\u01b0 ch\u00fang ta s\u1ebd th\u1ea5y \u1edf b\u01b0\u1edbc cu\u1ed1i c\u00f9ng, kh\u00f4ng ch\u1ec9 l\u00e0 c\u00f4ng vi\u1ec7c h\u00e0nh ch\u00ednh\u2014m\u00e0 c\u00f2n l\u00e0 n\u1ec1n t\u1ea3ng c\u01a1 b\u1ea3n c\u1ee7a m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady th\u00e0nh c\u00f4ng. C\u00e1c c\u00f4ng c\u1ee5 ch\u1ea9n \u0111o\u00e1n ti\u00ean ti\u1ebfn nh\u01b0 <a href=\"https:\/\/www.voltage-tester.com\/transformer-test-category\/\" rel=\"nofollow\">thi\u1ebft b\u1ecb ki\u1ec3m tra m\u00e1y bi\u1ebfn \u00e1p<\/a> v\u00e0 c\u00e1c nh\u00e0 ki\u1ec3m th\u1eed kh\u00e1c cung c\u1ea5p d\u1eef li\u1ec7u, nh\u01b0ng ch\u00ednh vi\u1ec7c ph\u00e2n t\u00edch k\u1ef9 l\u01b0\u1ee1ng c\u00e1c xu h\u01b0\u1edbng m\u1edbi bi\u1ebfn d\u1eef li\u1ec7u \u0111\u00f3 th\u00e0nh ki\u1ebfn th\u1ee9c th\u1ef1c ti\u1ec5n.<\/p>\n<h2 id=\"step-7-the-foundation-of-reliability-documentation-and-trending\">B\u01b0\u1edbc 7: N\u1ec1n t\u1ea3ng c\u1ee7a \u0111\u1ed9 tin c\u1eady \u2013 T\u00e0i li\u1ec7u v\u00e0 ph\u00e2n t\u00edch xu h\u01b0\u1edbng<\/h2>\n<p>B\u01b0\u1edbc cu\u1ed1i c\u00f9ng trong quy tr\u00ecnh ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c coi l\u00e0 b\u01b0\u1edbc mang l\u1ea1i gi\u00e1 tr\u1ecb l\u00e2u d\u00e0i nh\u1ea5t: vi\u1ec7c l\u1eadp h\u1ed3 s\u01a1 chi ti\u1ebft. N\u1ebfu kh\u00f4ng c\u00f3 h\u1ed3 s\u01a1 k\u1ebft qu\u1ea3 ki\u1ec3m tra r\u00f5 r\u00e0ng, nh\u1ea5t qu\u00e1n v\u00e0 d\u1ec5 ti\u1ebfp c\u1eadn, vi\u1ec7c ph\u00e2n t\u00edch xu h\u01b0\u1edbng \u2014 \u0111i\u1ec1u m\u00e0 ch\u00fang t\u00f4i \u0111\u00e3 x\u00e1c \u0111\u1ecbnh l\u00e0 kh\u00eda c\u1ea1nh quan tr\u1ecdng nh\u1ea5t trong vi\u1ec7c gi\u1ea3i th\u00edch k\u1ebft qu\u1ea3 \u2014 s\u1ebd tr\u1edf n\u00ean b\u1ea5t kh\u1ea3 thi. M\u1ed7i l\u1ea7n ki\u1ec3m tra \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n m\u1ed9t c\u00e1ch ri\u00eang l\u1ebb \u0111\u1ec1u l\u00e0 m\u1ed9t c\u01a1 h\u1ed9i b\u1ecb b\u1ecf l\u1ee1. Ng\u01b0\u1ee3c l\u1ea1i, m\u1ed7i l\u1ea7n ki\u1ec3m tra \u0111\u01b0\u1ee3c ghi ch\u00e9p nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a l\u1ecbch s\u1eed ki\u1ec3m tra t\u1ed5ng th\u1ec3 s\u1ebd tr\u1edf th\u00e0nh m\u1ed9t d\u1eef li\u1ec7u quan tr\u1ecdng trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady l\u00e2u d\u00e0i cho c\u01a1 s\u1edf c\u1ee7a qu\u00fd v\u1ecb.<\/p>\n<p>M\u1ed9t b\u00e1o c\u00e1o ki\u1ec3m tra to\u00e0n di\u1ec7n c\u00f3 nhi\u1ec1u ch\u1ee9c n\u0103ng. B\u00e1o c\u00e1o n\u00e0y cung c\u1ea5p m\u1ed9t b\u1ea3n ghi ch\u00ednh th\u1ee9c v\u1ec1 t\u00ecnh tr\u1ea1ng c\u1ee7a thi\u1ebft b\u1ecb t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3, \u0111\u00f3ng vai tr\u00f2 l\u00e0 c\u01a1 s\u1edf tham chi\u1ebfu cho c\u00e1c l\u1ea7n ki\u1ec3m tra trong t\u01b0\u01a1ng lai, \u0111\u1ed3ng th\u1eddi t\u1ea1o ra m\u1ed9t kho d\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n c\u00e1c s\u1ef1 c\u1ed1 v\u00e0 t\u1ed1i \u01b0u h\u00f3a l\u1ecbch tr\u00ecnh b\u1ea3o tr\u00ec.<\/p>\n<h3 id=\"what-to-record\">N\u00ean ghi l\u1ea1i nh\u1eefng g\u00ec<\/h3>\n<p>M\u1ed7i b\u00e1o c\u00e1o th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ph\u1ea3i bao g\u1ed3m \u00edt nh\u1ea5t c\u00e1c th\u00f4ng tin sau:<\/p>\n<ol>\n<li><strong>Nh\u1eadn d\u1ea1ng thi\u1ebft b\u1ecb:<\/strong> H\u00e3y m\u00f4 t\u1ea3 c\u1ee5 th\u1ec3. H\u00e3y ghi r\u00f5 s\u1ed1 ID t\u00e0i s\u1ea3n duy nh\u1ea5t, t\u00ean thi\u1ebft b\u1ecb, v\u1ecb tr\u00ed v\u00e0 th\u00f4ng tin tr\u00ean b\u1ea3ng hi\u1ec7u (\u0111i\u1ec7n \u00e1p, c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c, s\u1ed1 s\u00ea-ri). \"\u0110\u1ed9ng c\u01a1 M-101 t\u1ea1i Tr\u1ea1m b\u01a1m B\" s\u1ebd ch\u00ednh x\u00e1c h\u01a1n nhi\u1ec1u so v\u1edbi \"\u0110\u1ed9ng c\u01a1 b\u01a1m\".<\/li>\n<li><strong>Ng\u00e0y v\u00e0 gi\u1edd:<\/strong> Ng\u00e0y v\u00e0 gi\u1edd ch\u00ednh x\u00e1c c\u1ee7a k\u1ef3 thi l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t l\u1ed9 tr\u00ecnh r\u00f5 r\u00e0ng.<\/li>\n<li><strong>\u0110i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng:<\/strong> Ghi l\u1ea1i nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng, nhi\u1ec7t \u0111\u1ed9 c\u00e1ch nhi\u1ec7t c\u1ee7a thi\u1ebft b\u1ecb (y\u1ebfu t\u1ed1 n\u00e0y quan tr\u1ecdng h\u01a1n) v\u00e0 \u0111\u1ed9 \u1ea9m t\u01b0\u01a1ng \u0111\u1ed1i. Nh\u01b0 ch\u00fang ta \u0111\u00e3 th\u1ea5y, nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u1ea5t l\u1edbn \u0111\u1ebfn c\u00e1c ch\u1ec9 s\u1ed1 \u0111o \u0111\u01b0\u1ee3c.<\/li>\n<li><strong>Thi\u1ebft b\u1ecb th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng:<\/strong> H\u00e3y ghi l\u1ea1i t\u00ean nh\u00e0 s\u1ea3n xu\u1ea5t, m\u1eabu m\u00e3 v\u00e0 s\u1ed1 s\u00ea-ri c\u1ee7a m\u00e1y \u0111o megohm \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. \u0110i\u1ec1u n\u00e0y gi\u00fap \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c nhau theo th\u1eddi gian.<\/li>\n<li><strong>Th\u00f4ng s\u1ed1 th\u1eed nghi\u1ec7m:<\/strong>\n<ul>\n<li>\u0110i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng (v\u00ed d\u1ee5: 1000 V DC).<\/li>\n<li>Lo\u1ea1i x\u00e9t nghi\u1ec7m \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n (v\u00ed d\u1ee5: x\u00e9t nghi\u1ec7m t\u1ea1i ch\u1ed7, DAR, PI).<\/li>\n<li>C\u00e1c \u0111i\u1ec3m k\u1ebft n\u1ed1i (v\u00ed d\u1ee5: \"C\u00e1c cu\u1ed9n d\u00e2y U, V, W n\u1ed1i v\u1edbi \u0111i\u1ec3m n\u1ed1i \u0111\u1ea5t c\u1ee7a khung\").<\/li>\n<\/ul>\n<\/li>\n<li><strong>K\u1ebft qu\u1ea3:<\/strong>\n<ul>\n<li>\u0110\u1ed1i v\u1edbi th\u1eed nghi\u1ec7m PI, h\u00e3y ghi l\u1ea1i c\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf t\u1ea1i th\u1eddi \u0111i\u1ec3m 1 ph\u00fat v\u00e0 10 ph\u00fat.<\/li>\n<li>Ghi l\u1ea1i c\u00e1c gi\u00e1 tr\u1ecb PI v\u00e0\/ho\u1eb7c DAR \u0111\u00e3 t\u00ednh to\u00e1n.<\/li>\n<li>Ghi l\u1ea1i gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf cu\u1ed1i c\u00f9ng khi k\u1ebft th\u00fac th\u1eed nghi\u1ec7m.<\/li>\n<li>Ghi l\u1ea1i gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf \u0111\u00e3 hi\u1ec7u ch\u1ec9nh theo nhi\u1ec7t \u0111\u1ed9 (v\u00ed d\u1ee5: \"\u0110\u00e3 hi\u1ec7u ch\u1ec9nh v\u1ec1 40\u00b0C\").<\/li>\n<\/ul>\n<\/li>\n<li><strong>T\u00ean thanh tra:<\/strong> T\u00ean ho\u1eb7c ch\u1eef vi\u1ebft t\u1eaft c\u1ee7a k\u1ef9 thu\u1eadt vi\u00ean \u0111\u00e3 th\u1ef1c hi\u1ec7n th\u1eed nghi\u1ec7m.<\/li>\n<li><strong>\u00dd ki\u1ebfn\/Ghi ch\u00fa:<\/strong> Ph\u1ea7n n\u00e0y r\u1ea5t quan tr\u1ecdng. H\u00e3y ghi ch\u00fa l\u1ea1i b\u1ea5t k\u1ef3 \u0111i\u1ec1u g\u00ec b\u1ea5t th\u01b0\u1eddng m\u00e0 b\u1ea1n quan s\u00e1t \u0111\u01b0\u1ee3c trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m. Thi\u1ebft b\u1ecb c\u00f3 b\u1ecb b\u1ea9n nghi\u00eam tr\u1ecdng kh\u00f4ng? C\u00f3 d\u1ea5u hi\u1ec7u qu\u00e1 nhi\u1ec7t kh\u00f4ng? B\u1ea1n c\u00f3 nghe th\u1ea5y b\u1ea5t k\u1ef3 ti\u1ebfng \u0111\u1ed9ng b\u1ea5t th\u01b0\u1eddng n\u00e0o (nh\u01b0 ti\u1ebfng \u201cl\u00e1ch t\u00e1ch\u201d) trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m kh\u00f4ng? Nh\u1eefng quan s\u00e1t \u0111\u1ecbnh t\u00ednh n\u00e0y cung c\u1ea5p b\u1ed1i c\u1ea3nh m\u00e0 c\u00e1c con s\u1ed1 \u0111\u01a1n thu\u1ea7n kh\u00f4ng th\u1ec3 truy\u1ec1n t\u1ea3i \u0111\u01b0\u1ee3c.<\/li>\n<\/ol>\n<h3 id=\"from-paper-to-platform\">T\u1eeb gi\u1ea5y \u0111\u1ebfn n\u1ec1n t\u1ea3ng<\/h3>\n<p>Tr\u01b0\u1edbc \u0111\u00e2y, c\u00e1c h\u1ed3 s\u01a1 n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c ghi ch\u00e9p trong s\u1ed5 nh\u1eadt k\u00fd ho\u1eb7c tr\u00ean c\u00e1c bi\u1ec3u m\u1eabu gi\u1ea5y v\u00e0 c\u1ea5t gi\u1eef trong t\u1ee7 h\u1ed3 s\u01a1. Trong th\u1eddi \u0111\u1ea1i hi\u1ec7n \u0111\u1ea1i, c\u00e1c h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd b\u1ea3o tr\u00ec m\u00e1y t\u00ednh h\u00f3a (CMMS) ho\u1eb7c c\u00e1c n\u1ec1n t\u1ea3ng ph\u1ea7n m\u1ec1m qu\u1ea3n l\u00fd t\u00e0i s\u1ea3n chuy\u00ean d\u1ee5ng l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1i \u01b0u.<\/p>\n<p>C\u00e1c n\u1ec1n t\u1ea3ng k\u1ef9 thu\u1eadt s\u1ed1 cho ph\u00e9p:<\/p>\n<ul>\n<li><strong>Nh\u1eadp li\u1ec7u d\u1ec5 d\u00e0ng:<\/strong> C\u00e1c k\u1ef9 thu\u1eadt vi\u00ean th\u01b0\u1eddng c\u00f3 th\u1ec3 nh\u1eadp d\u1eef li\u1ec7u tr\u1ef1c ti\u1ebfp tr\u00ean m\u00e1y t\u00ednh b\u1ea3ng ho\u1eb7c m\u00e1y t\u00ednh x\u00e1ch tay ch\u1ed1ng va \u0111\u1eadp ngay t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng.<\/li>\n<li><strong>Xu h\u01b0\u1edbng t\u1ef1 \u0111\u1ed9ng:<\/strong> Ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 t\u1ef1 \u0111\u1ed9ng v\u1ebd \u0111\u1ed3 th\u1ecb bi\u1ec3u di\u1ec5n gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf \u0111\u00e3 hi\u1ec7u ch\u1ec9nh theo nhi\u1ec7t \u0111\u1ed9 v\u00e0 gi\u00e1 tr\u1ecb PI theo th\u1eddi gian, gi\u00fap xu h\u01b0\u1edbng gi\u1ea3m tr\u1edf n\u00ean r\u00f5 r\u00e0ng ngay l\u1eadp t\u1ee9c.<\/li>\n<li><strong>C\u00e0i \u0111\u1eb7t b\u00e1o th\u1ee9c:<\/strong> C\u00f3 th\u1ec3 thi\u1ebft l\u1eadp c\u00e1c ng\u01b0\u1ee1ng \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng \u0111\u00e1nh d\u1ea5u thi\u1ebft b\u1ecb khi gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi m\u1ed9t m\u1ee9c nh\u1ea5t \u0111\u1ecbnh ho\u1eb7c khi t\u1ed1c \u0111\u1ed9 suy gi\u1ea3m v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n \u0111\u00e3 \u0111\u1ecbnh tr\u01b0\u1edbc.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng ti\u1ebfp c\u1eadn:<\/strong> D\u1eef li\u1ec7u l\u1ecbch s\u1eed lu\u00f4n s\u1eb5n s\u00e0ng cho b\u1ea5t k\u1ef3 ng\u01b0\u1eddi d\u00f9ng n\u00e0o \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n, \u1edf b\u1ea5t k\u1ef3 \u0111\u00e2u v\u00e0 v\u00e0o b\u1ea5t k\u1ef3 l\u00fac n\u00e0o. \u0110i\u1ec1u n\u00e0y th\u1ef1c s\u1ef1 v\u00f4 c\u00f9ng h\u1eefu \u00edch khi c\u1ea7n kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 v\u00e0o gi\u1eefa \u0111\u00eam.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p l\u1eadp h\u1ed3 s\u01a1 c\u00f3 h\u1ec7 th\u1ed1ng, b\u1ea1n s\u1ebd bi\u1ebfn th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n t\u1eeb m\u1ed9t cu\u1ed9c ki\u1ec3m tra \u0111\u01a1n thu\u1ea7n theo ki\u1ec3u \u201c\u0111\u1ea1t\/kh\u00f4ng \u0111\u1ea1t\u201d th\u00e0nh m\u1ed9t c\u00f4ng c\u1ee5 d\u1ef1 b\u00e1o tinh vi. B\u1ea1n s\u1ebd c\u00f3 \u0111\u01b0\u1ee3c s\u1ef1 hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 t\u00ecnh tr\u1ea1ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb, t\u1eeb \u0111\u00f3 c\u00f3 th\u1ec3 chuy\u1ec3n t\u1eeb chi\u1ebfn l\u01b0\u1ee3c b\u1ea3o tr\u00ec ph\u1ea3n \u1ee9ng (s\u1eeda ch\u1eefa khi h\u1ecfng h\u00f3c) ho\u1eb7c ph\u00f2ng ng\u1eeba (s\u1eeda ch\u1eefa theo l\u1ecbch tr\u00ecnh) sang m\u1ed9t m\u00f4 h\u00ecnh d\u1ef1 \u0111o\u00e1n th\u1ef1c s\u1ef1, n\u01a1i vi\u1ec7c b\u1ea3o tr\u00ec \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ch\u00ednh x\u00e1c v\u00e0o th\u1eddi \u0111i\u1ec3m c\u1ea7n thi\u1ebft. Ph\u01b0\u01a1ng ph\u00e1p d\u1ef1a tr\u00ean d\u1eef li\u1ec7u n\u00e0y, \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi c\u00e1c c\u00f4ng c\u1ee5 \u0111\u00e1ng tin c\u1eady nh\u01b0 m\u00e1y \u0111o megohm hi\u1ec7n \u0111\u1ea1i v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng ti\u00ean ti\u1ebfn h\u01a1n nh\u01b0 m\u1ed9t <a href=\"https:\/\/www.voltage-tester.com\/transformer-test-category\/\" rel=\"nofollow\">thi\u1ebft b\u1ecb \u0111\u1ecbnh v\u1ecb s\u1ef1 c\u1ed1 c\u00e1p<\/a> b\u1edfi v\u00ec khi l\u1edbp c\u00e1ch nhi\u1ec7t cu\u1ed1i c\u00f9ng c\u0169ng b\u1ecb h\u1ecfng, \u0111\u00f3 ch\u00ednh l\u00e0 d\u1ea5u hi\u1ec7u \u0111\u1eb7c tr\u01b0ng c\u1ee7a m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady \u0111\u1eb3ng c\u1ea5p th\u1ebf gi\u1edbi, gi\u00fap ti\u1ebft ki\u1ec7m chi ph\u00ed, ng\u0103n ng\u1eeba th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng v\u00e0 \u0111\u1ea3m b\u1ea3o an to\u00e0n.<\/p>\n<h2 id=\"frequently-asked-questions-faq\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQ)<\/h2>\n<h3 id=\"what-is-a-good-megohm-reading\">Gi\u00e1 tr\u1ecb \u0111o megohm n\u00e0o \u0111\u01b0\u1ee3c coi l\u00e0 \"t\u1ed1t\"?<\/h3>\n<p>M\u1ed9t gi\u00e1 tr\u1ecb \u0111o \"t\u1ed1t\" l\u00e0 kh\u00e1i ni\u1ec7m r\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ee9c \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c, tu\u1ed5i th\u1ecd v\u00e0 lo\u1ea1i thi\u1ebft b\u1ecb. M\u1eb7c d\u00f9 c\u00e1c ti\u00eau chu\u1ea9n quy \u0111\u1ecbnh c\u00e1c gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u (v\u00ed d\u1ee5: 100 M\u03a9 \u0111\u1ed1i v\u1edbi h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb tr\u00ean 1 kV), m\u1ed9t h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng t\u1ed1t n\u00ean cho k\u1ebft qu\u1ea3 cao h\u01a1n nhi\u1ec1u, th\u01b0\u1eddng \u1edf m\u1ee9c h\u00e0ng ngh\u00ecn megohm (gigohm). Ch\u1ec9 s\u1ed1 quan tr\u1ecdng nh\u1ea5t kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t gi\u00e1 tr\u1ecb \u0111\u01a1n l\u1ebb m\u00e0 l\u00e0 xu h\u01b0\u1edbng \u1ed5n \u0111\u1ecbnh c\u1ee7a c\u00e1c gi\u00e1 tr\u1ecb \u0111o cao theo th\u1eddi gian. M\u1ed9t s\u1ef1 s\u1ee5t gi\u1ea3m \u0111\u1ed9t ng\u1ed9t, ngay c\u1ea3 khi gi\u00e1 tr\u1ecb \u0111\u00f3 v\u1eabn cao h\u01a1n m\u1ee9c t\u1ed1i thi\u1ec3u, c\u0169ng l\u00e0 nguy\u00ean nh\u00e2n \u0111\u00e1ng lo ng\u1ea1i.<\/p>\n<h3 id=\"how-often-should-i-perform-an-insulation-resistance-test\">T\u00f4i n\u00ean th\u1ef1c hi\u1ec7n ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n bao l\u00e2u m\u1ed9t l\u1ea7n?<\/h3>\n<p>T\u1ea7n su\u1ea5t ki\u1ec3m tra ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9 quan tr\u1ecdng c\u1ee7a thi\u1ebft b\u1ecb v\u00e0 \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh. \u0110\u1ed1i v\u1edbi c\u00e1c \u0111\u1ed9ng c\u01a1 quan tr\u1ecdng ho\u1ea1t \u0111\u1ed9ng trong m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t v\u00e0 \u1ea9m \u01b0\u1edbt, vi\u1ec7c ki\u1ec3m tra c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n h\u00e0ng qu\u00fd ho\u1eb7c n\u1eeda n\u0103m m\u1ed9t l\u1ea7n. \u0110\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u00edt quan tr\u1ecdng h\u01a1n trong m\u00f4i tr\u01b0\u1eddng s\u1ea1ch s\u1ebd v\u00e0 kh\u00f4 r\u00e1o, vi\u1ec7c ki\u1ec3m tra h\u00e0ng n\u0103m ho\u1eb7c hai n\u0103m m\u1ed9t l\u1ea7n c\u00f3 th\u1ec3 l\u00e0 \u0111\u1ee7. K\u1ebft qu\u1ea3 c\u1ee7a c\u00e1c l\u1ea7n ki\u1ec3m tra tr\u01b0\u1edbc \u0111\u00f3 c\u0169ng n\u00ean \u0111\u01b0\u1ee3c xem x\u00e9t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u1ea7n su\u1ea5t; n\u1ebfu nh\u1eadn th\u1ea5y xu h\u01b0\u1edbng suy gi\u1ea3m, kho\u1ea3ng th\u1eddi gian gi\u1eefa c\u00e1c l\u1ea7n ki\u1ec3m tra n\u00ean \u0111\u01b0\u1ee3c r\u00fat ng\u1eafn.<\/p>\n<h3 id=\"can-an-insulation-resistance-test-damage-my-equipment\">Vi\u1ec7c ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng thi\u1ebft b\u1ecb c\u1ee7a t\u00f4i kh\u00f4ng?<\/h3>\n<p>Khi \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u00fang c\u00e1ch v\u1edbi \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m ph\u00f9 h\u1ee3p d\u1ef1a tr\u00ean th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a thi\u1ebft b\u1ecb (theo c\u00e1c b\u1ea3ng trong B\u01b0\u1edbc 3), th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n l\u00e0 m\u1ed9t quy tr\u00ecnh kh\u00f4ng ph\u00e1 h\u1ee7y. \u0110i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t v\u00e0 kh\u00f4ng \u0111\u1ee7 cao \u0111\u1ec3 g\u00e2y h\u01b0 h\u1ecfng cho l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u00f2n t\u1ed1t. Tuy nhi\u00ean, vi\u1ec7c \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p qu\u00e1 cao m\u1ed9t c\u00e1ch \u0111\u00e1ng k\u1ec3 (v\u00ed d\u1ee5: 5000V cho m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n 120V) c\u00f3 th\u1ec3 g\u00e2y h\u01b0 h\u1ecfng, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111i\u1ec7n \u00e1p ch\u00ednh x\u00e1c l\u00e0 m\u1ed9t b\u01b0\u1edbc quan tr\u1ecdng.<\/p>\n<h3 id=\"my-reading-is-very-low-or-zero-what-should-i-do-first\">Ch\u1ec9 s\u1ed1 \u0111o c\u1ee7a t\u00f4i r\u1ea5t th\u1ea5p ho\u1eb7c b\u1eb1ng kh\u00f4ng. T\u00f4i n\u00ean l\u00e0m g\u00ec tr\u01b0\u1edbc ti\u00ean?<\/h3>\n<p>Gi\u00e1 tr\u1ecb \u0111o r\u1ea5t th\u1ea5p cho th\u1ea5y c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng d\u1eabn r\u00f2 r\u1ec9 d\u00f2ng \u0111i\u1ec7n \u0111\u00e1ng k\u1ec3. Tr\u01b0\u1edbc khi k\u1ebft lu\u1eadn thi\u1ebft b\u1ecb b\u1ecb h\u1ecfng, h\u00e3y ki\u1ec3m tra l\u1ea1i to\u00e0n b\u1ed9 quy tr\u00ecnh c\u1ee7a b\u1ea1n. Th\u1ee9 nh\u1ea5t, \u0111\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e1ch ly ho\u00e0n to\u00e0n; m\u1ed9t k\u1ebft n\u1ed1i d\u00e2y trung t\u00ednh ho\u1eb7c m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n b\u1ecb b\u1ecf s\u00f3t c\u00f3 th\u1ec3 t\u1ea1o th\u00e0nh \u0111\u01b0\u1eddng d\u1eabn xu\u1ed1ng \u0111\u1ea5t. Th\u1ee9 hai, ki\u1ec3m tra k\u1ef9 l\u1ea1i c\u00e1c k\u1ebft n\u1ed1i d\u00e2y \u0111o. Th\u1ee9 ba, l\u00e0m s\u1ea1ch v\u00e0 lau kh\u00f4 k\u1ef9 c\u00e1c \u0111i\u1ec3m k\u1ebft n\u1ed1i v\u00e0 ch\u1ea5t c\u00e1ch \u0111i\u1ec7n \u0111\u1ec3 lo\u1ea1i tr\u1eeb nguy\u00ean nh\u00e2n r\u00f2 r\u1ec9 b\u1ec1 m\u1eb7t. N\u1ebfu ch\u1ec9 s\u1ed1 v\u1eabn th\u1ea5p sau khi ki\u1ec3m tra c\u00e1c b\u01b0\u1edbc n\u00e0y, \u0111i\u1ec1u \u0111\u00f3 cho th\u1ea5y c\u00f3 v\u1ea5n \u0111\u1ec1 c\u00e1ch \u0111i\u1ec7n th\u1ef1c s\u1ef1 c\u1ea7n \u0111\u01b0\u1ee3c \u0111i\u1ec1u tra v\u00e0 s\u1eeda ch\u1eefa th\u00eam.<\/p>\n<h3 id=\"what-is-the-difference-between-an-insulation-resistance-test-and-a-hipot-test\">S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n v\u00e0 th\u1eed nghi\u1ec7m Hipot l\u00e0 g\u00ec?<\/h3>\n<p>\u0110\u00e2y l\u00e0 hai b\u00e0i ki\u1ec3m tra kh\u00e1c nhau v\u1edbi hai m\u1ee5c \u0111\u00edch kh\u00e1c nhau. B\u00e0i ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n l\u00e0 m\u1ed9t b\u00e0i ki\u1ec3m tra ch\u1ea9n \u0111o\u00e1n. B\u00e0i ki\u1ec3m tra n\u00e0y s\u1eed d\u1ee5ng \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u (DC) t\u01b0\u01a1ng \u0111\u1ed1i th\u1ea5p \u0111\u1ec3 \u0111o ch\u1ea5t l\u01b0\u1ee3ng c\u00e1ch \u0111i\u1ec7n b\u1eb1ng \u0111\u01a1n v\u1ecb megohm, gi\u00fap d\u1ef1 \u0111o\u00e1n c\u00e1c s\u1ef1 c\u1ed1 c\u00f3 th\u1ec3 x\u1ea3y ra trong t\u01b0\u01a1ng lai. Th\u1eed nghi\u1ec7m Hipot (High Potential) l\u00e0 m\u1ed9t th\u1eed nghi\u1ec7m x\u00e1c nh\u1eadn. Th\u1eed nghi\u1ec7m n\u00e0y \u00e1p d\u1ee5ng \u0111i\u1ec7n \u00e1p cao h\u01a1n nhi\u1ec1u (th\u01b0\u1eddng l\u00e0 AC) trong m\u1ed9t kho\u1ea3ng th\u1eddi gian ng\u1eafn \u0111\u1ec3 ch\u1ee9ng minh r\u1eb1ng l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c m\u1ed9t m\u1ee9c qu\u00e1 \u00e1p c\u1ee5 th\u1ec3 m\u00e0 kh\u00f4ng b\u1ecb h\u1ecfng. \u0110\u00e2y l\u00e0 m\u1ed9t th\u1eed nghi\u1ec7m \u0111\u1ea1t\/kh\u00f4ng \u0111\u1ea1t v\u00e0 kh\u00f4ng cung c\u1ea5p gi\u00e1 tr\u1ecb \u0111\u1ecbnh l\u01b0\u1ee3ng nh\u01b0 m\u00e1y \u0111o megohm. Th\u1eed nghi\u1ec7m Hipot g\u00e2y \u00e1p l\u1ef1c l\u1edbn v\u00e0 th\u01b0\u1eddng ch\u1ec9 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean thi\u1ebft b\u1ecb m\u1edbi ho\u1eb7c sau khi s\u1eeda ch\u1eefa l\u1edbn.<\/p>\n<h3 id=\"why-is-my-pi-reading-greater-than-10-is-that-a-problem\">T\u1ea1i sao ch\u1ec9 s\u1ed1 PI c\u1ee7a t\u00f4i l\u1ea1i l\u1edbn h\u01a1n 10? \u0110i\u1ec1u \u0111\u00f3 c\u00f3 ph\u1ea3i l\u00e0 v\u1ea5n \u0111\u1ec1 kh\u00f4ng?<\/h3>\n<p>Gi\u00e1 tr\u1ecb PI r\u1ea5t cao (v\u00ed d\u1ee5: &gt;10) th\u01b0\u1eddng kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ea5n \u0111\u1ec1; \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng cho th\u1ea5y v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t c\u1ef1c k\u1ef3 kh\u00f4 r\u00e1o, s\u1ea1ch s\u1ebd v\u00e0 th\u01b0\u1eddng l\u00e0 m\u1edbi. Tuy nhi\u00ean, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p hi\u1ebfm hoi \u0111\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 lo\u1ea1i h\u1ec7 th\u1ed1ng c\u00e1ch nhi\u1ec7t nh\u1ea5t \u0111\u1ecbnh, gi\u00e1 tr\u1ecb r\u1ea5t cao c\u00f3 th\u1ec3 do ph\u1ea3n \u1ee9ng phi tuy\u1ebfn t\u00ednh g\u00e2y ra v\u00e0 c\u00f3 th\u1ec3 c\u1ea7n ph\u1ea3i ki\u1ec3m tra k\u1ef9 h\u01a1n, nh\u01b0ng nh\u00ecn chung, \u0111\u00e2y \u0111\u01b0\u1ee3c coi l\u00e0 d\u1ea5u hi\u1ec7u cho th\u1ea5y t\u00ecnh tr\u1ea1ng c\u00e1ch nhi\u1ec7t r\u1ea5t t\u1ed1t.<\/p>\n<h3 id=\"what-is-the-purpose-of-the-60-second-wait-time-for-a-spot-reading\">M\u1ee5c \u0111\u00edch c\u1ee7a vi\u1ec7c ch\u1edd 60 gi\u00e2y tr\u01b0\u1edbc khi \u0111o n\u1ed3ng \u0111\u1ed9 c\u1ed3n l\u00e0 g\u00ec?<\/h3>\n<p>Th\u1eddi gian 60 gi\u00e2y l\u00e0 kho\u1ea3ng th\u1eddi gian ti\u00eau chu\u1ea9n gi\u00fap d\u00f2ng \u0111i\u1ec7n s\u1ea1c \u0111i\u1ec7n dung ban \u0111\u1ea7u \u2013 v\u1ed1n thay \u0111\u1ed5i r\u1ea5t nhanh \u2013 gi\u1ea3m xu\u1ed1ng m\u1ee9c c\u00f3 th\u1ec3 b\u1ecf qua. B\u1eb1ng c\u00e1ch ch\u1edd \u0111\u1ee3i trong m\u1ed9t ph\u00fat, b\u1ea1n \u0111\u1ea3m b\u1ea3o r\u1eb1ng gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c ch\u1ee7 y\u1ebfu b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi c\u00e1c d\u00f2ng \u0111i\u1ec7n h\u1ea5p th\u1ee5 v\u00e0 r\u00f2 r\u1ec9 \u1ed5n \u0111\u1ecbnh h\u01a1n, t\u1eeb \u0111\u00f3 gi\u00fap k\u1ebft qu\u1ea3 \u0111o l\u01b0\u1eddng c\u00f3 \u0111\u1ed9 l\u1eb7p l\u1ea1i cao h\u01a1n v\u00e0 d\u1ec5 so s\u00e1nh h\u01a1n theo th\u1eddi gian.<\/p>\n<h2 id=\"conclusion\">K\u1ebft lu\u1eadn<\/h2>\n<p>Khi \u0111\u01b0\u1ee3c ti\u1ebfp c\u1eadn m\u1ed9t c\u00e1ch c\u00f3 h\u1ec7 th\u1ed1ng v\u00e0 d\u1ef1a tr\u00ean ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n, th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t ph\u00e9p \u0111o l\u01b0\u1eddng m\u00e0 c\u00f2n tr\u1edf th\u00e0nh n\u1ec1n t\u1ea3ng cho \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng \u0111i\u1ec7n. \u0110\u00e2y l\u00e0 m\u1ed9t cu\u1ed9c \u0111\u1ed1i tho\u1ea1i s\u00e2u s\u1eafc v\u1edbi thi\u1ebft b\u1ecb c\u1ee7a ch\u00fang ta, gi\u00fap ch\u00fang ta hi\u1ec3u r\u00f5 t\u00ecnh tr\u1ea1ng c\u1ee7a n\u00f3, d\u1ef1 \u0111o\u00e1n c\u00e1c nhu c\u1ea7u v\u00e0 ng\u0103n ch\u1eb7n s\u1ef1 c\u1ed1 b\u1ea5t ng\u1edd. B\u1ea3y b\u01b0\u1edbc \u0111\u01b0\u1ee3c n\u00eau ra \u2014 t\u1eeb cam k\u1ebft v\u1eefng ch\u1eafc v\u1ec1 an to\u00e0n trong vi\u1ec7c ng\u1eaft ngu\u1ed3n, qua vi\u1ec7c chu\u1ea9n b\u1ecb thi\u1ebft b\u1ecb m\u1ed9t c\u00e1ch t\u1ec9 m\u1ec9, l\u1ef1a ch\u1ecdn \u0111i\u1ec7n \u00e1p th\u1eed nghi\u1ec7m m\u1ed9t c\u00e1ch th\u1eadn tr\u1ecdng, \u0111\u1ebfn vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00e1c quy tr\u00ecnh th\u1eed nghi\u1ec7m m\u1ed9t c\u00e1ch kh\u00e9o l\u00e9o \u2014 t\u1ea1o th\u00e0nh m\u1ed9t khung kh\u1ed5 to\u00e0n di\u1ec7n cho cu\u1ed9c \u0111\u1ed1i tho\u1ea1i n\u00e0y.<\/p>\n<p>Tuy nhi\u00ean, s\u1ef1 th\u00e0nh th\u1ea1o th\u1ef1c s\u1ef1 trong l\u0129nh v\u1ef1c n\u00e0y kh\u00f4ng ch\u1ec9 n\u1eb1m \u1edf vi\u1ec7c th\u1ef1c hi\u1ec7n m\u00e0 c\u00f2n \u1edf c\u00e1ch di\u1ec5n gi\u1ea3i. Hi\u1ec3u r\u1eb1ng m\u1ed9t con s\u1ed1 \u0111\u01a1n l\u1ebb ch\u1ec9 l\u00e0 m\u1ed9t chi ti\u1ebft ph\u1ee5, trong khi c\u00e2u chuy\u1ec7n \u0111\u01b0\u1ee3c k\u1ec3 qua c\u00e1c t\u1ef7 l\u1ec7 nh\u01b0 PI v\u00e0 b\u1ee9c tranh d\u00e0i h\u1ea1n \u0111\u01b0\u1ee3c h\u00e9 l\u1ed9 qua d\u1eef li\u1ec7u xu h\u01b0\u1edbng m\u1edbi ch\u00ednh l\u00e0 \u0111i\u1ec3m nh\u1ea5n. \u0110\u00e2y ch\u00ednh l\u00e0 s\u1ef1 chuy\u1ec3n \u0111\u1ed5i t\u1eeb t\u01b0 duy ph\u1ea3n \u1ee9ng sang t\u01b0 duy d\u1ef1 b\u00e1o. Vi\u1ec7c ghi ch\u00e9p t\u1ec9 m\u1ec9 ch\u00ednh l\u00e0 ng\u00f4n ng\u1eef \u0111\u1ec3 vi\u1ebft n\u00ean c\u00e2u chuy\u1ec7n n\u00e0y, bi\u1ebfn c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u r\u1eddi r\u1ea1c th\u00e0nh th\u00f4ng tin c\u00f3 gi\u00e1 tr\u1ecb th\u1ef1c ti\u1ec5n. B\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn to\u00e0n di\u1ec7n n\u00e0y, c\u00e1c chuy\u00ean gia b\u1ea3o tr\u00ec c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n cho nh\u00e2n vi\u00ean, gi\u1ea3m thi\u1ec3u th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng t\u1ed1n k\u00e9m v\u00e0 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c t\u00e0i s\u1ea3n \u0111i\u1ec7n quan tr\u1ecdng \u0111ang cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho th\u1ebf gi\u1edbi c\u1ee7a ch\u00fang ta.<\/p>\n<h2 id=\"references\">T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ol>\n<li>IEEE. (2013). IEEE 43-2013 \u2013 H\u01b0\u1edbng d\u1eabn th\u1ef1c h\u00e0nh c\u1ee7a IEEE v\u1ec1 ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n c\u1ee7a m\u00e1y m\u00f3c quay. Hi\u1ec7p h\u1ed9i Ti\u00eau chu\u1ea9n IEEE. <\/li>\n<li>Hi\u1ec7p h\u1ed9i Ki\u1ec3m \u0111\u1ecbnh \u0110i\u1ec7n Qu\u1ed1c t\u1ebf. (2021). ANSI\/NETA ATS-2021: Ti\u00eau chu\u1ea9n v\u1ec1 c\u00e1c quy \u0111\u1ecbnh ki\u1ec3m tra nghi\u1ec7m thu \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb v\u00e0 h\u1ec7 th\u1ed1ng \u0111i\u1ec7n. NETA. <\/li>\n<li>Megger. (kh\u00f4ng ghi ng\u00e0y th\u00e1ng). \u201cM\u1ed9t m\u0169i kh\u00e2u k\u1ecbp th\u1eddi: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 ki\u1ec3m tra c\u00e1ch \u0111i\u1ec7n\u201d. Megger Group Limited. Truy c\u1eadp t\u1eeb <\/li>\n<li>B\u1ed9 Lao \u0111\u1ed9ng Hoa K\u1ef3. (kh\u00f4ng ghi ng\u00e0y th\u00e1ng). Ki\u1ec3m so\u00e1t n\u0103ng l\u01b0\u1ee3ng nguy hi\u1ec3m (Kh\u00f3a\/G\u1eafn nh\u00e3n) \u2013 1910.147. C\u1ee5c An to\u00e0n v\u00e0 S\u1ee9c kh\u1ecfe Lao \u0111\u1ed9ng. Truy c\u1eadp t\u1eeb <\/li>\n<li>C\u00f4ng ty Fluke. (2020). Nh\u1eefng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n. Fluke. Truy c\u1eadp t\u1eeb <a href=\"https:\/\/www.fluke.com\/en-us\/learn\/blog\/insulation-resistance\/basics-of-insulation-resistance-testing\" rel=\"nofollow\">https:\/\/www.fluke.com\/en-us\/learn\/blog\/insulation-resistance\/basics-of-insulation-resistance-testing<\/a><\/li>\n<li>Chauvin Arnoux. (2018). \u0110o l\u01b0\u1eddng \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n. Truy c\u1eadp t\u1eeb <\/li>\n<li>X\u00e2y d\u1ef1ng v\u00e0 B\u1ea3o tr\u00ec H\u1ec7 th\u1ed1ng \u0110i\u1ec7n (EC&amp;M). (2010). Hi\u1ec3u r\u00f5 v\u1ec1 Th\u1eed nghi\u1ec7m \u0110i\u1ec7n tr\u1edf C\u00e1ch \u0111i\u1ec7n. Endeavor Business Media. Truy c\u1eadp t\u1eeb <a href=\"https:\/\/www.ecmweb.com\/preventive-maintenance\/article\/20894086\/making-sense-of-insulation-resistance-testing\" rel=\"nofollow\">https:\/\/www.ecmweb.com\/preventive-maintenance\/article\/20894086\/making-sense-of-insulation-resistance-testing<\/a><\/li>\n<li>Biddle, James G. (1966). C\u1ea9m nang v\u1ec1 \u201cKi\u1ec3m tra c\u00e1ch \u0111i\u1ec7n\u201d d\u00e0nh cho ng\u01b0\u1eddi th\u1ef1c h\u00e0nh. James G. Biddle Co. Tr\u00edch t\u1eeb <\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>T\u00f3m t\u1eaft: Th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p \u0111\u00e1nh gi\u00e1 kh\u00f4ng ph\u00e1 h\u1ee7y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o m\u1ee9c \u0111\u1ed9 c\u1ea3n tr\u1edf d\u00f2ng \u0111i\u1ec7n \u0111i qua l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u1ee7a thi\u1ebft b\u1ecb \u0111i\u1ec7n. Ph\u01b0\u01a1ng ph\u00e1p \u0111\u00e1nh gi\u00e1 n\u00e0y c\u00f3 vai tr\u00f2 c\u01a1 b\u1ea3n trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u1eadn h\u00e0nh v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng nh\u01b0 \u0111\u1ed9ng c\u01a1, m\u00e1y bi\u1ebfn \u00e1p v\u00e0 c\u00e1p \u0111i\u1ec7n. Quy tr\u00ecnh n\u00e0y bao g\u1ed3m vi\u1ec7c \u00e1p d\u1ee5ng m\u1ed9t \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u \u1ed5n \u0111\u1ecbnh v\u00e0 cao v\u00e0o thi\u1ebft b\u1ecb [\u2026]<\/p>","protected":false},"author":1,"featured_media":1929,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[771],"tags":[],"class_list":["post-1928","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-company-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>A 7-Step Expert Guide: How to Perform an Insulation Resistance Test Correctly - Run Test<\/title>\n<meta name=\"description\" content=\"China transformer test supplier, we provide Relay Protection Test, Resistance test, Circuit Breaker Test, and Partial Discharge Test for you with good price.\" \/>\n<meta name=\"robots\" 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