Partial Discharge Measurement in Low Voltage Cable Diagnostics

Many diagnostic methods have been developed for medium and high voltage cables, but the application of these methods for low voltage cables is limited. Usually, the testing voltage is much higher than the nominal voltage of low voltage cables therefore the testing object is exposed to voltage stress. By the results of authors, the diagnostic parameters can be affected on the voltage stress [1]. The partial discharge (PD) measurement is widely used method for fault detection of PE insulated medium voltage cables. The application of PD measurement for low voltage PE cables was examined by thermally and electrically aged specimens in this paper.