Analysis and improvement of mal-operation in distance protection of multi-stage series transmission line with single power source

被引：0
|
作者：
Wang H. [1 ]
Li Y. [1 ]
Zhang Y. [1 ]
Wang W. [1 ]
Zeng Z. [2 ]
Cao L. [3 ]
机构：
[1] Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin
[2] State Grid Chongqing Electric Power Company, Chongqing
[3] State Grid Hebei Electric Power Co., Ltd., Shijiazhuang
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2021年 / 41卷 / 02期
关键词：
Distance protection; Distributed capacitance; Multi-stage collusion; Negative-sequence direction component; Relay protection; Single power source;
D O I：
10.16081/j.epae.202011023
中图分类号：
学科分类号：
摘要：
Based on a case of mal-operation in distance protection of multi-stage series transmission line with single power source, the cause of mal-operation of protection are discussed in detail, which points out:when the external single-phase grounding fault near protection installation location of the transmission line, due to the influence of distributed capacitance, the negative-sequence direction component judging the fault direction will fall into the forward zone, causing the mal-operation of protection. In order to solve the above problems, a fault direction criterion based on the phase relation between positive-sequence current and negative-sequence current is proposed based on the traditional criterion of negative-sequence direction component, and the action interval of positive direction is given. The PSCAD/EMTDC simulation verifies that the proposed direction criterion is not affected by the transition resistance, and solves the problem of mal-operation of the distance protection when the external fault occurs near protection installation location. © 2021, Electric Power Automation Equipment Press. All right reserved.
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页码：179 / 185
页数：6
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