Evolutionary Characteristics of Interfacial Defects Inside Vehicle-Mounted High-Voltage Cable Termination for High-Speed Trains

Partial discharge caused by interfacial defects of cable terminations is an important factor affecting insulating performance, which will seriously threaten operational safety of high-speed trains by causing a breakdown fault of vehicle-mounted cable terminations. Simulation combined with experimentation is adopted to study the evolution characteristic of interfacial defects inside cable termination for high-speed trains. A simulation model and test samples of high-voltage cable terminations with prefabricated air gap and carbon trace defects are constructed. Results show that maximum field strength (MFS) at the defect is always located at the end of it. Evolution of the defects can be significantly divided…