PD testing and monitoring of HV cable systems

PD is continuously monitored at the two joints of a 2.7 km long, 230 kV cable placed in an underground tunnel. The advanced features for the suppression of disturbances and for separation of different types of insulation defects based on synchronous multi-channel and multi-frequency techniques are shown. The processing of monitoring data is implemented in a modular software system that allows reliable long-term storage of monitoring data and provides remote access via a web interface.