从而通过计算得知设备所经受的冲击电流和需要的开断容量，给选择设备提供技术依据。
And through the calculation of the electric equipment and experienced impact to open to choose equipment capacity and provide technical basis.
因此，电网短路容量水平必须在运行质量和开关开断能力间折中决策。
Therefore, the short-circuit capacity of the power network must be decided in the middle way between the running quality and the breaking capacity of the switches.
电力系统的容量和短路电流越来越大，相应的对系统的稳定性和断路器的开断能力等提出了更高的要求。
As the power systems expand, the fault currents would be increase to exceed the instantaneous capacity and the interrupting capabilities of the existing circuit breakers.
电力系统的容量和短路电流越来越大，相应的对系统的稳定性和断路器的开断能力等提出了更高的要求。
As the power systems expand, the fault currents would be increase to exceed the instantaneous capacity and the interrupting capabilities of the existing circuit breakers.
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