Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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一起220 kV线路纵联零序方向保护误动原因分析及对策

来源:电工电气发布时间:2018-08-16 10:16 浏览次数:538
一起220 kV线路纵联零序方向保护误动原因分析及对策
 
邵庆祝, 谢民,王同文,王海港
(国网安徽省电力公司,安徽 合肥 230022)
 
    摘 要:针对一起220 kV 线路纵联零序方向保护误动事件,分析了环网系统接地故障零负序电流分布特征,结果表明在环网系统线路区外特定地点发生接地故障时,可能出现线路同一侧零负序功率方向相反的情况,若两侧功率方向判据方法不一致,可能导致线路纵联零序方向保护误动。根据误动原因分析,提出了改进措施,对提升系统线路纵联保护可靠运行有良好的借鉴作用。
    关键词:纵联零序方向保护;接地故障;误动;功率方向判据
    中图分类号:TM773     文献标识码:B     文章编号:1007-3175(2018)08-0059-04
 
Analysis of Malfunction of 220 kV Line Pilot Zero-Sequence Direction Protection and Its Countermeasures
 
SHAO Qing-zhu, XIE Min, WANG Tong-wen, WANG Hai-gang
(State Grid Anhui Electric Power Company, Hefei 230022, China)
 
    Abstract: In view of a malfunction event of 220 kV line pilot zero-sequence direction protection, this paper analyzed the distribution characteristics of the zero-negative-sequence current of grounding fault in the loop network system. The analysis shows that the zero-negativepower on one end of a line could be in the opposite direction when the grounding fault occurs at a specific location outside of the line in the loop network system. If the power direction criterion on two ends of the line is inconsistent, it may cause the malfunction of the line pilot zero-sequence direction protection. On the basis of the analysis of malfunction causes. This paper puts forward some improving measures, which could be used to improve the reliability of the line pilot protection with good reference functions.
    Key words: pilot zero-sequence direction protection; grounding fault; malfunction; power direction criterion
 
参考文献
[1] 李钢,冯辰虎,孙集伟,等. 平行运行线路互感对纵联零序方向保护的影响[J]. 华北电力技术,2007(12):1-4.
[2] 李钢, 路洁, 白晶, 等. 一起平行运行线路纵联零序方向保护误动分析[J]. 电力系统自动化,2008, 32(14):104-107.
[3] 张琦兵. 平行线弱电强磁下零序方向元件的改进[J]. 电力系统自动化,2013,37(7):94-98.
[4] 田宝江,张太升,陈军,等. 不平衡零序电流对纵联零序保护的影响分析及其对策[J]. 电力系统自动化,2013,37(19):132-135.
[5] 陈水耀, 姚仲焕. 电压回路中性线对零序方向保护的影响分析与防范措施[J]. 继电器,2008,36(14):80-82.
[6] 陈文哲,郝治国,张保会,等. 同塔双回线纵向故障特征分析及零序方向保护改进[J]. 电力自动化设备,2016,36(11):133-139.
[7] 谢俊,李勇,刘宏君,等. 线路纵联零序方向保护误动机理分析及对策研究[J]. 电力系统保护与控制,2017,45(4):19-25.
[8] 蒋苏静,毕天姝,徐振宇,等. 平行双回线路纵联零序方向误动原因分析及负序功率方向研究[J].电力系统保护与控制,2009,37(24):21-26.
[9] 陈水耀,黄少锋,杨松伟. 互感引起的零序方向保护误动分析与对策[J]. 中国电力,2016,49(5):59-62.