一种600MW级及以上机组保安段切换系统的设计与实现

Design and implementation of a security segment switching system for 600MW and above units

600MW级及以上的机组,当装设发电机断路器或负荷开关时,可不设高压厂用备用变压器,从另一台机组的高压厂用母线引接本机组的高压停机电源,互为事故停机电源,而事故停机电源通常仅作为本机组停机检修电源,无法实现与工作电源之间的快速切换,这种接线方式对保安段切换系统提出了更高的要求。通过在保安段配置四电源切换系统,由快切装置实现保安段电源之间切换,切换方式灵活,运行安全可靠,具有一定的借鉴参考意义。

When installing generator circuit breakers or load switches,600MW and above units do not have to install standby transformer,the high-voltage shutdown power of the unit is connected to the high-voltage shutdown power from the another unit,it is usually used only as the power supply for the shutdown maintenance of the unit,unable to achieve a quick switch with the working power supply.This kind of connection puts forward higher requirements for security segment switching system.By configuring a four-power switching system in the security segment,switching between power supply is realized by fast cutting device,switching mode is flexible,operation is safe and reliable,it has certain reference significance.