Interface Stress Simulation of 200kV Gas-filled Plug-in DC Cable Termination

The cable termination is one of the vulnerable parts of the whole system. For oil-filled terminations, internal breakdown can produce severe damage to the surrounding equipment and human beings. At present, the rated voltage of gas-filled plug-in AC cable terminations is up to 550 kV and a lot of engineering and application experience shows that the gas-filled plug-in cable terminations have the benefits of no isolation liquids, shorter installation time and compacter design. In order to introduce the advantages of plug-in cable termination of AC power systems for DC power systems, it is necessary to carry out simulation modeling research on plug-in DC cable terminations. Based on the accumulated experience in the development of DC cable accessories, in this paper, a model of a 200 kV plug-in DC cable termination is presented and used to simulate the interfacial electric field under typical conditions according to relevant type test standards for DC cable systems.