Touching Fault and Its Risk Protection Analysis for AC/DC Crossed Transmission Lines

Xiaohua LI; Zipeng LIANG; Jiawei FENG; Shaofan ZHANG; Jie CAO; Xiaobing DING

doi:10.7500/AEPS20190310003

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Touching Fault and Its Risk Protection Analysis for AC/DC Crossed Transmission Lines

Basic Research | 更新时间：2025-06-16

- Touching Fault and Its Risk Protection Analysis for AC/DC Crossed Transmission Lines
- Automation of Electric Power Systems Vol. 44, Issue 9, Pages: 52-59(2020)
- 作者机构：
  
  1. 华南理工大学电力学院,广东省广州市 510640
  2. 广州供电局有限公司，广东省广州市 510620
  3. 中国南方电网电力调度控制中心，广东省广州市 510623
- 作者简介：
- 基金信息：
  
  Abstract:
  In order to solve the bipolar commissioning problem of high voltage direct current (HVDC) transmission projects while the construction of conventional earth electrodes are not completed, the unconventional earth electrode operation schemes, including in-station deep electrodes and out-station simple electrodes, are introduced. Then the electrical performance of electrodes, human safety, electrode heating, DC bias of transformers and diverting potential are studied. The main conclusions are as follows: in-station deep electrode schemes are technically feasible, but isolating measures should be taken to avoid high induced DC potential of earthing grid endangering the safety of equipment and human, for out-station simple electrode schemes, the step voltage and electrode temperature rise requirements are difficult to meet in monopole operation mode. So unbalanced current control measures should be introduced to ensure the safety of equipment and human near electrodes.
  Foundation:This work is supported by National Natural Science Foundation of China;National Natural Science Foundation of China-State Grid Corporation of China Joint Fund Project
- DOI：10.7500/AEPS20190310003
  CLC：
- Received：10 March 2019，
  
  Revised：2019-09-08，
  
  Published Online：03 February 2020，
  
  Published：10 May 2020
- 稿件说明：
移动端阅览
李晓华,梁子鹏,冯家伟等.交直流交叉跨越碰线故障及其保护风险分析[J].电力系统自动化,2020,44(9):52-59.

LI Xiaohua,LIANG Zipeng,FENG Jiawei,et al.Touching Fault and Its Risk Protection Analysis for AC/DC Crossed Transmission Lines[J].Automation of Electric Power Systems,2020,44(9):52-59.
李晓华,梁子鹏,冯家伟等.交直流交叉跨越碰线故障及其保护风险分析[J].电力系统自动化,2020,44(9):52-59. DOI： 10.7500/AEPS20190310003.

LI Xiaohua,LIANG Zipeng,FENG Jiawei,et al.Touching Fault and Its Risk Protection Analysis for AC/DC Crossed Transmission Lines[J].Automation of Electric Power Systems,2020,44(9):52-59. DOI： 10.7500/AEPS20190310003.

摘要

中国直流输电工程输送距离长、跨度大，与交流线路跨越的情况日益增多。电网出现了新的故障形式——交直流碰线故障，其故障特征及对继电保护的影响研究比较匮乏。对碰线故障的特征进行理论分析，基于详细直流工程PSCAD/EMTDC仿真平台搭建交直流同塔模型，对碰线故障引起的特征量及其影响因素进行研究，并分析其对交直流保护动作特性的潜在挑战。仿真结果表明：碰线故障引入的工频分量会使直流线路行波保护动作率降低；行波保护与交直流碰线保护在保护配合范围内存在动作死区；交流距离保护灵敏度下降。

Abstract

The DC transmission projects in China have long transmission distance and large span

and the crossing between AC lines and DC lines is increasing day by day. A new fault type

touching fault of AC/DC transmission lines

emerges. There is lack of study on characteristics of touching fault and their influence on relay protection. Theoretical analysis on characteristics of touching fault for AC/DC transmission lines is made. AC/DC tower model is developed based on PSCAD/EMTDC simulation platform of detailed DC project. The characteristic quantities and key factors caused by touching fault are investigated

and its potential challenges on operation characteristic of AC/DC protection are analyzed. Simulation results show that the fundamental frequency component introduced by touching fault can reduce the action rate of traveling wave protection for DC lines

there is an action dead zone in protection range between traveling wave protection and touching protection for AC/DC lines

and the sensitivity of AC distance protection is lower.

关键词

Keywords

references

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