母线保护双重化改造CT极性验证优化  

CT Polarity Verification and Optimization for Dual Modification of Bus Bar Protection

作　　者：李奎霖 周剑 LI Kui-lin;ZHOU Jian(State Grid Xinyuan Company Ltd.Xinanjiang Hydropower Plant,Hangzhou 311600,China;State Grid Xinyuan Company Ltd.Overhaul Branch,Hangzhou 311000,China)

机构地区：[1]国网新源水电有限公司新安江水力发电厂,浙江杭州311600 [2]国网新源控股有限公司检修分公司,浙江杭州311000

出　　处：《云南水力发电》2022年第10期237-239,共3页Yunnan Water Power

摘　　要：220kV及以上电压等级继电保护设备要求双重化配置。为验证母线保护双重化改造验证新接入的CT绕组极性正确性,常规做法是待母线保护所有支路都接入以后通过带负荷试验查看母差差流来判断接入的支路CT绕组极性是否正确。通过改进CT绕组极性验证方法,可以在完成一个支路的接入工作后通过该支路带负荷试验用相位表比较原有电流回路和改造后新增电流回路的相位关系,来判断新增CT绕组的极性。相位表为0表示新增CT绕组极性正确,否则则表示新增CT绕组极性异常。该方法简单,避免投产试验时因CT极性不正确造成带负荷试验强制中断。220 kV and above voltage level relay protection equipment requires dual configuration.In order to verify the polarity correctness of newly connected CT windings by double transformation of bus protection,it is common practice to check bus differential current through load test after all branches of bus protection have been connected to determine whether the polarity of CT windings of the newly connected branch is correct.By improving the polarity verification method of CT winding,the polarity of new CT winding can be judged by comparing the phase relation between the original current circuit and the new current circuit after the accessing work of a branch with a phase meter in the load test of the branch.Phase table 0 indicates the polarity of the new CT winding is correct,otherwise the polarity of the new CT winding is abnormal.This method is simple and avoids forced interruption of load test due to incorrect polarity of CT during commissioning test.

关 键 词：母线保护 双重化改造 CT极性 优化 

分 类 号：TM774[电气工程—电力系统及自动化]