串联补偿对差动保护的影响分析

李振动; 赵青春; 董杰; 宋巍; 赵哲源; 李亚明; 王天乙; 田霖

引用本文:	李振动,赵青春,董杰,等.串联补偿对差动保护的影响分析[J].电力系统保护与控制,2015,43(10):139-143.
	LI Zhendong,ZHAO Qingchun,DONG Jie,et al.Research on influence of series compensation on differential protection[J].Power System Protection and Control,2015,43(10):139-143

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串联补偿对差动保护的影响分析
李振动¹, 赵青春², 董杰¹, 宋巍¹, 赵哲源¹, 李亚明¹, 王天乙¹, 田霖¹
1.国网冀北电力有限公司检修分公司，北京 102488;2.南京南瑞继保电气有限公司，江苏南京 211102

摘要:

根据冀北地区万顺500 kV特高压输电线路建立模型，分析串联补偿线路出现“电流反向”问题的根本原因和可能性。结合万顺具体算例，研究串补线路中差动比例系数K值在不同故障点、串补度、经高阻接地和MOV是否被击穿等情况下的变化趋势。代入现状运行方式下的具体参数，通过RTDS对模型进行数字模拟实验，深入探讨单双回串补线路运行状况下串联补偿对零序差动和分相差动保护动作特性的影响，得出过渡电阻、故障点、系统参数以及负荷变化等情况的差动保护动作结论，并给出万顺串联补偿线路保护装置的合理改进建议。

关键词: 串联补偿电流反向差动保护过渡电阻比例系数

DOI：10.7667/j.issn.1674-3415.2015.10.023

分类号:

基金项目:

Research on influence of series compensation on differential protection

LI Zhendong¹, ZHAO Qingchun², DONG Jie¹, SONG Wei¹, ZHAO Zheyuan¹, LI Yaming¹, WANG Tianyi¹, TIAN Lin¹

1.State Grid Jibei Electricity Power Maintenance Company, Beijing 102488, China;2.NR Electric Co., Ltd., Nanjing 211102, China

Abstract:

This paper analyzes the primary causes and its possibility of the reversed current in serial compensation lines, according to the model of Jibei Wanshun 500 kV ultra-high voltage transmission line. Besides, the variation tendencies of differential protection ratio coefficient K of serial compensation lines on the condition of at different failure points, degrees of series compensation, grounding circumstances via high resistance and MOV breakdown are discussed by specific cases in this study. Practical variables under current operation mode are taken into simulation by RTDS. The performance characteristics of zero-sequence differential and phase difference protection affected by serial compensation are presented under single/double line operation modes. Since then, the performances of differential protection with variant transient resistance, failure points, systematic variables and load are obtained, furthermore, the improvements of Wanshun serial compensation protection devices are recommended at the end.

Key words: series compensation current reverse differential protection transient resistance ratio coefficient

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