Off-Line Cable PD Testing with VLF

LIVE HV can now provide Off-Line Partial Discharge testing for cables using a VLF test set to energise the cable.

Already leading the way with On-Line Partial Discharge testing for all assets and Off-Line PD testing for Switchgear it was a natural progression to start providing Off-Line PD testing for cables.

VLF allows us to energise high capacitance assets such as long cables but it also presents challenges when designing a PD test system. The noise generated by the VLF must be blocked with a HV filter and the low frequency (0.1 Hz) waveform requires an oscilloscope to operate on Peak Detect mode for PD measurement