Short-circuit current exceeds the circuit breaker breaking capacity

With the power system through its own  Voltage stabilizer  and internetworking, system structure become more complex, short-circuit and short circuit current capacity is also growing. When the short-circuit current exceeds the breaking capacity of the circuit breaker, the circuit breaker can not be  mcb circuit breaker  cut short circuit fault, it would  air circuit breaker  threaten the whole power system electrical equipment for safe operation. At present, the existing high-voltage circuit breaker breaking current general 63kA. ABB in the voltage level of 126kV SF6 Circuit Breakers maximum breaking current up to 80kA, no domestic products the same parameters independent intellectual property rights.