中国电力 ›› 2021, Vol. 54 ›› Issue (2): 140-146.doi: 10.11930/j.issn.1004-9649.201903072

• 电网 • 上一篇    

基于回路直流电阻测量的输电线路单相接地故障离线故障定位

李福志1, 郑卫宾1, 张文海2, 张智勇1, 林德锋1, 张旭波1, 张荣建1   

  1. 1. 国网四川省电力公司检修公司,四川 成都 610042;
    2. 四川大学 电气工程学院,四川 成都 610065
  • 收稿日期:2019-03-26 修回日期:2019-10-30 发布日期:2021-02-06
  • 作者简介:张文海(1989-),男,通信作者,博士,助理研究员,从事故障检测定位、设备状态检修,E-mail:zhangwh1989@163.com

Fault Path Direct-Current Resistance Based Off-Line Single-Phase-To-Ground Fault Location

LI Fuzhi1, ZHENG Weibin1, ZHANG Wenhai2, ZHANG Zhiyong1, LIN Defeng1, ZHANG Xubo1, ZHANG Rongjian1   

  1. 1. State Grid Sichuan Maintenance Company, Chengdu 610042, China;
    2. College of Electrical Engineering, Sichuan University, Chengdu 610065, China
  • Received:2019-03-26 Revised:2019-10-30 Published:2021-02-06

摘要: 首先基于线路绝缘电阻测量进行故障检测和诊断——识别故障类型和故障相,然后针对发生率最高的单相接地故障,提出基于回路直流电阻测量的离线故障定位方法。定位前先对线路直流电阻和大地回路电阻进行测量,随后考虑接地电阻影响,分别利用故障相构建两回独立电压方程组,通过求解方程组计算故障距离。基于PSCAD/EMTDC搭建仿真模型进行验证,证明了方法正确性,同时将该方法在现场进行了应用,证明了方法的有效性,对于及时清除新建和大修线路的故障并保证线路的及时投运有重要作用。

关键词: 直流电阻, 故障定位, 输电线路, 离线:故障诊断

Abstract: In order to figure out the off-line transmission line fault location, a new fault location method based on fault path direct current resistance measurement is proposed. Firstly, an off-line fault detection and diagnosis method based on three-phase insulation resistance measurement is proposed, including fault type and fault phase diagnosis. Then the single-phase-to-ground fault location method is proposed which occurred the most frequently. In the proposed methods, the ground resistance and three phase direct-current resistance between two substations are measured firstly. Then considering the effect of fault resistance, the KVL is used to form two independent equations which contain two unknown numbers, fault resistance and fault distance. Then fault distance and fault resistance can be figured out by solving equation set. The proposed method is verified in the PSCAD/EMTDC by simulation. The correctness and accuracy of the proposed fault location method are verified. Also it is verified in the field test. It is helpful for clearing the fault for newly-built lines and overhaul lines. It is very important to ensure that transmission lines are put into operation on time.

Key words: direct-current resistance, fault location, transmission line, off-line: fault diagnosis