Simulation method for large current opening process of circuit breaker based on damped oscillating voltage

The circuit breaker opening test needs to be carried out under conditions of both high voltage and high current. The traditional method is to use the synthetic loop method, which requires a very large capacity power supply, and the cost of the test is very high too. in this paper, a simulation method based on the damped oscillating voltage circuit breaker for high current breaking process is introduced. A simulation platform including DC power, light-controlled thyristor switches, reactors and capacitors was established. Through the cooperation of the capacitor and the reactor, the oscillation frequency of 50 Hz is obtained. Under the voltage of 40 kV, the amplitude of the oscillating current exceeds 100 A, and the duration exceeds 100ms. The breaking process of the circuit breaker generally does not exceed 100ms, which indicates that the method proposed in this paper can fully meet the requirements of the circuit breaker breaking simulation test. Finally, experimental verification was conducted on the established platform.