Research on Interrupting Processes of A 10 kV Mechanical HVDC Circuit Breaker

Flexible HVDC transmission has wide prospects in new energy grid connection and consumption, rail traction, and the urban distribution network in the future. Mechanical HVDC circuit breaker is one of the most potential breaking methods in the future due to its high current interruption ability and low on-state loss. Firstly, the parameters di/dt and du/dt which affect them breaking performance are analyzed in this paper. Then, the variation of voltage and current characteristics of a 10kV mechanical HVDC circuit breaker under different operating conditions are simulated with Matlab/Simulink. Finally, the impact of two typical circuit breaker failures on di/dt and du/dt were analyzed and compared.