引用本文: | 程乐峰,余 涛.基于PSCAD/EMTDC的配网检修线路临时挂接地线仿真模型研究[J].电力系统保护与控制,2016,44(20):75-85.[点击复制] |
CHENG Lefeng,YU Tao.Research on simulation model of temporary ground wires hanging on distribution maintenance lines based on PSCAD/EMTDC[J].Power System Protection and Control,2016,44(20):75-85[点击复制] |
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摘要: |
针对10 kV配网线路改造检修工作,存在漏、拆接地线情况,可能导致恶性“带地线合闸”事故发生,研究基于信号注入的检修线路临时挂接地线检测方法。根据配网特点,搭建适合地区电网变电站和输电线路的电磁暂态仿真模型,模拟线路检修时挂接地线的物理环境。结合PSCAD/EMTDC模型,验证检测方案的合理性,并分析配网各因素对检测精度的影响,主要包括:不同注入信号频率、变压器接入、线路分支较多、同杆并架和大地电阻等。基于仿真分析,提出一种基于电流分流原理的检测方案。仿真表明实际情况与理论符合,可有效检测三相接地、两相接地和单相接地情况,具有较好的实用性,对于10 kV配网线路检修工作,具有一定参考意义。 |
关键词: 配网线路 检修 临时挂接地线 PSCAD/EMTDC 电流分流原理 |
DOI:10.7667/PSPC151797 |
投稿时间:2015-10-12修订日期:2016-01-03 |
基金项目:国家自然科学基金项目(51177051,51477055);中国南方电网科技项目资助(K-GD2014-204) |
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Research on simulation model of temporary ground wires hanging on distribution maintenance lines based on PSCAD/EMTDC |
CHENG Lefeng,YU Tao |
(College of Electric Power, South China University of Technology, Guangzhou 510640, China) |
Abstract: |
Aimed at the lines rebuilding and maintenance work in 10 kV distribution network, the vicious accident of “closing with grounding wire” may happen due to miss removing the temporary grounding wires after the work, a grounding wire detection method based on signal injection is studied. According to the features of distribution network, an electromagnetic transient simulation model, which is suitable for power station and transmission lines, is established to simulate the physical environment of temporary grounding wires during lines maintenance work. Combined with the PSCAD/EMTDC model, the rationality of proposed detection scheme is verified, and then the factors impacting the detection precision is simulated for analysis, which contain different signal frequency, transformer access, line branches, common-tower transmission lines and the earth resistance. Based on simulation analysis, a detection scheme based on current diversion principle is proposed, and its simulation condition is proved same with theoretic situation, which could effectively detect the three-phase, two-phase and single phase grounding situations, thus has a better practicability, and for 10 kV distribution network lines maintenance work, as well as a certain guiding significance. This work is supported by National Natural Science Foundation of China (No. 51177051 and No. 51477055) and the Science & Technology Project of China Southern Power Grid Company (No. K-GD2014-204). |
Key words: distribution network line maintenance temporary hanging ground wire PSCAD/EMTDC current diversion principle |