In order to improve long-term reliability of polymer power cables, it is essential to understand the mechanisms of degradation and breakdown of solid insulation materials such as crosslinked polyethylene (XLPE), ethylene-propylene rubber and its interfacial phenomena. The insulation performance of polymers usually decreases quickly with high voltage application, if partial discharges(PD) occur in voids or defects. Hence, PD detection and diagnosis are one of the most important means to test HV cables. In this work, firstly it was shown the PD characteristics of simulated XLPE/EPR interface of...