引用本文: | 刘怀宇,邓迎君,陈 昊,等.放电间隙异常对准稳态情况下500 kV母差保护的影响分析[J].电力系统保护与控制,2020,48(21):173-178.[点击复制] |
LIU Huaiyu,DENG Yingjun,,CHEN Hao,,et al.Analysis of the influence of 500 kV bus-bar differential protection in a quasi-steady state caused by a discharge gap anomaly[J].Power System Protection and Control,2020,48(21):173-178[点击复制] |
|
摘要: |
分析了一起因电流互感器二次接线盒内放电间隙金属片短接引起的保护电流回路缺陷。基于保护电流回路图,搭建等效电路模型。同时对在准稳态情况下因放电间隙金属片短接所引起的流入500 kV母差保护电流分流情况进行基础理论分析。在此基础上结合简化等效电路模型搭建Pspice电路仿真模型,进一步阐释此异常对500 kV母差保护装置采样电流的影响。最后结合500 kV母差保护逻辑,在准稳态情况下分析放电间隙异常对500 kV母差保护功能的影响。 |
关键词: 放电间隙 电流回路 Pspice仿真 缺陷 500 kV母差保护 |
DOI:DOI: 10.19783/j.cnki.pspc.191547 |
修订日期:2020-02-08 |
基金项目:国家自然科学基金项目资助(51807028) |
|
Analysis of the influence of 500 kV bus-bar differential protection in a quasi-steady state caused by a discharge gap anomaly |
LIU Huaiyu,DENG Yingjun,,CHEN Hao,,WANG Jianfeng,,XU Jingran |
(1. Maintenance Branch of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211102, China;
2. XJ Group Corporation, Xuchang 461000, China; 3. Nanjing Power Supply Company of State Grid
Jiangsu Electric Power Co., Ltd., Nanjing 210019, China) |
Abstract: |
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.
This work is supported by National Natural Science Foundation of China (No. 51807028). |
Key words: discharge gap current circuit Pspice simulation defect 500 kV bus-bar differential protection |