Fault Analysis of a 35 kV SF₆ Circuit Breaker With Low Frequency Alarm Caused by Air Pressure

The air pressure of SF₆ gas insulated high-voltage circuit breakers can change due to leakage and weather temperature, significant impact on the safe operation of substations. The article provides a specific analysis of the case. When a fault occurs due to low-frequency pressure alarm, it is necessary to check the circuit breaker for air leakage, quickly locate the fault point, and strengthen prevention during daily operation and maintenance.