Medium-Voltage Cables, Part 6 FactoryTh/iStock/Thinkstock

Medium-Voltage Cables, Part 6

The very low frequency (VLF) method is, in many ways, similar to the high-pot (more so the AC version).

Testing medium-voltage (MV) cables with the high-potential (“hi-pot”) test is typically part of an MV cable testing program. In Parts 4 and 5, we looked at the DC and AC versions of this test. The very low frequency (VLF) version is, in many ways, similar to the high-pot (more so the AC version). It’s simple, and the test equipment is both inexpensive (relatively speaking) and very portable. Unlike the DC hi-pot (and like the AC hi-pot), it does not have the space charge dra

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