直流输电系统接地极过电压保护缺陷分析及改进措施

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直流输电系统接地极过电压保护缺陷分析及改进措施

更新时间：2025-08-13

- 直流输电系统接地极过电压保护缺陷分析及改进措施
- Automation of Electric Power Systems Vol. 32, Issue 7, Pages: 104-107(2008)
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- Published：2008
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[J]. Automation of electric power systems, 2008, 32(7): 104-107.
DOI：

[J]. Automation of electric power systems, 2008, 32(7): 104-107. DOI：

摘要

直流输电保护系统中的接地极过电压保护主要用于检测接地极断线故障，天广和高肇直流输电系统采用的接地极线路过电压保护中，检测到中性母线电压高于门槛值并满足延时条件后，便迅速合上高速接地开关———这一动作后果存在严重缺陷，在单极大地回线运行方式下将影响正常极的稳定运行，并很可能对换流站内设备和人身造成危害。文中结合直流输电系统接线方式分析了这一缺陷，并借助实时数字仿真（RTDS）系统和运行实例进行了验证，给出了改进建议，这有利于完善接地极保护功能，确保直流输电系统的安全稳定运行。

Abstract

There is a serious hidden trouble in overvoltage protection (open electrode protection (59EL)) of Tian-Guan and Gui-Guang I HVDC transmission project which is used to detect excessive voltages that may occur if the electrode opens (both electrode line conductors): the running pole maybe blocked because of the incorrect action of open electrode protection of other pole. In this paper

the overvoltage protection is discussed first

then analyzed the defect based on the configuration of HVDC transmission system

which is confirmed by simulation on RTDS and actual case

at last

the improved suggestion is introduced to optimize the function of Electrode Line Protection and improve the reliability of HVDC transmission system.

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Related Author

LEI Xiao

Related Institution

China Electric Power Research Institute

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