摘要
某500kV智能变电站的220kV母线保护在一次系统无故障的情况下,不定期出现因差流过大导致保护频繁起动的问题。通过科学的试验方法对故障机理开展了硏究,试验结果表明,母线差动保护接入的支路数量、CT电流比和负荷电流等因素使母线差动保护的差流测量产生了误差,从而导致保护频繁起动。由此,推测出保护算法缺陷导致了此问题。并对相应的程序进行修改和试验验证。
In a 500 kV smart substation , in the case of a fault-free system, the problem of frequent start丒up of 220 kV busbar protection due to a large difference in flow is irregular.The failure mechanism was studied through scientific test methods. The test results show that the number of branch connections, the ratio of CT transformation, and the load current, etc., which are connected to the busbar protection, cause errors in the differential measurement of the busbar protection which resulted in protection frequent start-up. Based on this, it is inferred that the defect of the protection algorithm leads to this problem. The corresponding program is modified and tested.
作者
周文越
李霞
郑永康
ZHOU Wenyue;LI Xia;ZHEN Yongkang(Sichuan Electric Power Research Institute,Chengdu 610072,China;Chengdu Power Supply Company,Chengdu 610041,China)
出处
《电气应用》
2019年第4期37-41,共5页
Electrotechnical Application
关键词
智能变电站
母线保护
故障分析
试验验证
intelligent substation
bus protection
fault analysis
experimental verification
