同杆双回线环流对方向纵联保护的影响及改进

LI Bin; LI Xuebin; DING Maosheng; ZENG Hongyan

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同杆双回线环流对方向纵联保护的影响及改进

更新时间：2025-08-13

- 同杆双回线环流对方向纵联保护的影响及改进
- Automation of Electric Power Systems Vol. 35, Issue 8, Pages: 103-107(2011)
- 作者机构：
  
  1. 天津大学电力系统仿真控制教育部重点实验室,天津市,300072
  2. 宁夏电力调度通信中心，宁夏回族自治区银川市,750001
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2011
- 稿件说明：
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LI Bin, LI Xuebin, DING Maosheng, et al. [J]. Automation of electric power systems, 2011, 35(8): 103-107.
DOI：

LI Bin, LI Xuebin, DING Maosheng, et al. [J]. Automation of electric power systems, 2011, 35(8): 103-107. DOI：

摘要

在分析同杆双回线主要的排列方式和不平衡电流现象的基础上，研究了超高压同杆双回输电线路在区外相间故障时由于零序环流超过门槛值造成的零序功率方向元件误动事故。对同杆双回线零序环流不平衡度进行了分析，并利用EMTDC对同杆双回线发生区外相间故障时的零序环流不平衡度进行了仿真计算。针对零序环流造成同杆双回线方向纵联保护误动的情况，提出了同杆双回线序分量方向纵联保护的改进措施。

Abstract

Based on analysis of several main arrangements of same-pole double-circuit transmission line（SDTL） and unbalanced current phenomenon， a fault caused by zero-sequence power directional component mal-operation resulted from over threshold value of zero-sequence circulating current， when an external inter-phase fault happened in EHV SDTL， is analyzed. Then the analysis method of zero-sequence circulating current unbalance of SDTL is given. And a simulation of zero-sequence circulating current unbalance for an external inter-phase fault on SDTL is completed with EMTDC. As for mal-operation of SDTL directional pilot protection caused by zero-sequence circulating current， the improvement measures of SDTL's directional pilot protection based on the sequence components is put forward.

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