110kV庄北变电站保护定值整定中存在的问题及解决方案

Problems Existing in Fixed Value Setting of 110 kV Zhuangbei Substation and Its Solution

因庄北变电站的负荷属于钢铁冶炼性质,在正常生产时经常出现很大的工作短路电流,引起保护的频繁启动及误动作,经过对运行方式的调整及保护装置的升级,对变压器保护配置及出口回路的调整,确保了用户供电的可靠性及电网主设备的安全运行。该方案对于相似负荷性质的供电网络有一定的参考作用,针对运行经验提出了继电保护与运行方式的密切联系,同时对电网建设部门的设备选型提出了要求。

Because the load characteristics of Zhuangbei Substation belong to the style of iron and steel melting, the large service short - circuit current ofter occurs during the normal operation, which will cause the frequent action and miss operation of the protection. Through changing the operating mode and updating the protection device, the regulation for the protection con- figuration and outlet circuit of transformer will guarantee the reliability of power supply and the stable operation of gird main equipment. The proposed scheme provides some references for power supply system with the same load characteristics, the close relationship between relay protection and operating mode is presented incorporating the operation experiences, and the requirements for the equipment type selection of grid construction departments are proposed too.