When the base station or the equipment morn fall into a short - circuit accident, circuit breakers of/uses may play an important role in the stability of power system. The system using a quota - ruducing method to select the circuit breakers and thses can enhances the safety of electrical source. And the point - scanning method to determine the selective coordination of them can do better to ensure the stability of a power supply system.%基站或者机房中设备发生短路事故，断路器或熔断器直接影响电源系统的稳定性。在电源系统中，用降额法选择断路器和熔断器型号并利用脱扣曲线和电流特性曲线确定使用范围能提高电源安全性；描点绘图法确定二者选择性配合方式能够保障稳定的电源系统。
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