Simulation and partial discharge detection for typical defects of 10 kV cable the joint

摘要

In order to explore the partial discharge characteristics of 10 kV XLPE insulated cable (hereinafter referred to as ‘XLPE cable’), first six typical defects are made on the main insulation according to the requirements of the installation process and the key process in which quality problem easily occur. They are: The main insulation has a dent, the main insulation has a knife wound, the main insulation has a metal tip, the main insulation surface has impurities, the high voltage end has a metal tip, and the stripping of the semi-conductive fracture is irregular. Then, the voltage step up test is carried out, and the test is monitored by the local discharge detection system. The test results show that the typical defects caused by the installation of 10 kV XLPE cable joint will produce serious local discharge phenomenon, and the initial discharge voltage is low and the stable discharge quantity is large.