Answer Posted / blake australia

A lot of HV cables are XLPE not PVC. If you Megger a 33kV
cable with a DC voltage then you may damage the XLPE
semiconductor around the cable.
Industry standard in Australia(although very expensive to
buy one) is to use a VLF (very low frequency) tester to
test the cables. Same principal as mentioned, just uses an
AC waveform (~.1Hz) opposed to a DC waveform.

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