252 kV断路器分合闸线圈在环境因素下的劣化规律研究

Under long-term operating conditions, the performance of opening/closing coil of high voltage circuit breakers degrades due to the environmental factors such as temperature, humidity and salt spray. The damp heat test is used to simulate the effects of temperature and humidity on the opening/closing coil of 252 kV circuit breaker, and the alternating salt spray test is used to simulate the combined effects of temperature, humidity and salt spray on the opening/closing coil of 252 kV circuit breaker. The degradation of the opening/closing coil under the corresponding conditions and the change of the opening/closing coil currents are studied. The study results show that the degradation of 252 kV circuit breaker's opening/closing coil under hot and humid environment is a process of rapid change, which cannot be reflected by the opening/closing coil currents, and the degradation of 252 kV circuit breaker's opening/closing coil under salt spray environment is a nonlinear acceleration process.