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在发电厂中，母联开关能否迅速切断事故母线与另一侧母线的联系，最大限度地降低事故区域，是减少全厂停电事故，保证安全发电的重要条件之一．许多中、小型水电厂中母联开关靠机组过流保护启动延时跳闸，当母线上设备发生短路事故时，因系统送电线路开关限时电流速断保护整定
In the power plant, the bus switch can quickly cut off the accident bus and the other side of the bus link to minimize the accident area is to reduce the power plant accidents, to ensure safe power generation is one of the important conditions. In many medium and small hydropower plants, the mains switch is tripped by the overcurrent protection of the generating unit and when the equipment on the busbar is short-circuited, the current-limiting protection of the transmission line is limited