{"id":170,"date":"2022-09-14T08:44:00","date_gmt":"2022-09-14T08:44:00","guid":{"rendered":"https:\/\/www.voltage-tester.com\/?p=170"},"modified":"2025-04-24T02:16:22","modified_gmt":"2025-04-24T02:16:22","slug":"what-is-a-vlf-electrical-test","status":"publish","type":"post","link":"https:\/\/www.voltage-tester.com\/vi\/what-is-a-vlf-electrical-test-article\/","title":{"rendered":"Ki\u1ec3m tra \u0111i\u1ec7n VLF l\u00e0 g\u00ec?"},"content":{"rendered":"

T\u1ea7n s\u1ed1 c\u1ef1c th\u1ea5p (VLF)<\/strong>\u00a0Th\u1eed nghi\u1ec7m ch\u1ea9n \u0111o\u00e1n l\u00e0 vi\u1ec7c \u00e1p d\u1ee5ng d\u1ea1ng s\u00f3ng sin xoay chi\u1ec1u, th\u01b0\u1eddng \u1edf t\u1ea7n s\u1ed1 0,1 Hz ho\u1eb7c th\u1ea5p h\u01a1n, \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 ch\u1ea5t l\u01b0\u1ee3ng c\u00e1ch \u0111i\u1ec7n trong c\u00e1c t\u1ea3i c\u00f3 \u0111i\u1ec7n dung cao, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1p.
Th\u1eed nghi\u1ec7m t\u1ea7n s\u1ed1 r\u1ea5t th\u1ea5p (VLF) \u0111\u1ed1i v\u1edbi c\u00e1p trung \u00e1p v\u00e0 cao \u00e1p l\u00e0 ph\u01b0\u01a1ng ph\u00e1p d\u00f9ng \u0111\u1ec3 ki\u1ec3m tra t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a l\u1edbp c\u00e1ch \u0111i\u1ec7n c\u00e1p. Th\u1eed nghi\u1ec7m VLF l\u00e0 m\u1ed9t th\u1eed nghi\u1ec7m ch\u1ecbu \u0111\u1ef1ng, th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u1edf t\u1ea7n s\u1ed1 trong kho\u1ea3ng t\u1eeb 0,1 Hz \u0111\u1ebfn 0,01 Hz, thay v\u00ec 50\/60 Hz.<\/p>\n\n\n\n

\"Ki\u1ec3m<\/figure>\n\n\n\n
\"Ki\u1ec3m<\/figure>","protected":false},"excerpt":{"rendered":"

Very low frequency (VLF)\u00a0diagnostic testing is the application of an AC sinusoidal waveform, generally applied at 0.1 Hz or lower, to assess the quality of electrical insulation in high capacitive loads, such as cables.Very Low Frequency testing for Medium Voltage and High Voltage cables is a method for verifying the integrity of the cable insulation. 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