Practical experiences in on-site PD diagnosis tests of HV power cable accessories in service

The presented paper deals with preventive on-site PD diagnostics of HV cable terminations under operation voltage using an ultra-wide-band (UWB) PD probing. In order to assess the detected PD level quantitatively as "equivalent apparent charge" a sensitivity check has been performed. The results reveal that by means of the applied method potential PD defects in GIS-cable terminations could well be recognized where a PD detection sensitivity as low as few pC was achieved