Analysis of the influence of 500 kV bus-bar differential protection in a quasi-steady state caused by a discharge gap anomaly

被引：0
|
作者：
Liu H. [1 ]
Deng Y. [2 ]
Chen H. [1 ]
Wang J. [1 ]
Xu J. [3 ]
机构：
[1] Maintenance Branch of State Grid Jiangsu Electric Power Co., Ltd., Nanjing
[2] XJ Group Corporation, Xuchang
[3] Nanjing Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd., Nanjing
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2020年 / 48卷 / 21期
基金：
中国国家自然科学基金;
关键词：
500 kV bus-bar differential protection; Current circuit; Defect; Discharge gap; Pspice simulation;
D O I：
10.19783/j.cnki.pspc.191547
中图分类号：
学科分类号：
摘要：
A protection current circuit defect, which is caused by the short connection of a discharge gap metal sheet in the secondary junction box of a current transformer, is analyzed in this paper. Based on the protection current circuit diagram, the equivalent circuit model is presented. At the same time, the current shunt of 500 kV bus-bar differential protection in a quasi-steady state, caused by the short connection of a discharge gap metal sheet, is analyzed theoretically. On this basis, combined with the simplified equivalent circuit model, a circuit simulation model is built by the Pspice. Then, the influence of this anomaly on the sampling current of a 500 kV bus-bar differential protection device is further highlighted. Finally, combined with the protection logic of 500 kV bus-bar differential protection, the influence of a discharge gap anomaly on 500 kV bus-bar differential protection function is analyzed in a quasi-steady state. © 2020, Power System Protection and Control Press. All right reserved.
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收藏
页码：173 / 178
页数：5
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