基于电压变化特征的110kV线路断线故障自适应判别方法  

Self-adaptive Identification Method for 110kV Line Disconnection Fault Based on Characteristics of Voltage Changes

作　　者：陈永明 刘昶 李静 杨茹 侯超 姚鹏 CHEN Yongming;LIU Chang;LI Jing;YANG Ru;HOU Chao;YAO Peng(Zhenjiang PowerSupplyCompany,State GridJiangsuElectricPowerCo.,Ltd,Zhenjiang 212000,China)

机构地区：[1]国网江苏省电力有限公司镇江供电分公司,镇江212000

出　　处：《电力系统及其自动化学报》2022年第8期93-101,共9页Proceedings of the CSU-EPSA

基　　金：国网江苏省电力有限公司科技项目(J2020151)。

摘　　要：随着110 kV输电线路规模的迅速扩大,断线故障时有发生,但目前针对此断线故障缺乏系统的理论研究。为此,对110 kV单电源供电线路在不同情况下的单相断线故障识别方法开展了研究。首先,采用对称分量法分析了110 kV线路上发生6种单相断线情况的故障电气量变化特征,总结得出故障电流和电压变化的一般规律。在此基础上,提出了一种110 k V线路自适应断线故障判别方法,该方法采用变压器低压侧负序电压的变化作为断线保护的启动判据,根据系统零序阻抗与正序阻抗的比值自适应地调整电压动作值的断线保护动作判据,并基于变压器高压侧相电流突变量实现短路闭锁。最后,建立了110 kV线路各种情况下的单相断线故障仿真模型。仿真结果验证了该方法的理论正确性与可行性。With the rapid expansion of 110 kV transmission lines,disconnection faults occur from time to time. However,there is a lack of systematic theoretical research on the disconnection faults of 110 kV transmission lines. In this paper,the research on the single-phase disconnection fault identification method for 110 kV single power supply line under different conditions is carried out. First,the symmetrical component method is used to analyze the characteristics of electrical changes under six types of single-phase disconnection fault on 110 kV lines,and the general rules of fault current and voltage changes are summarized. On this basis,a 110 kV line adaptive disconnection fault identification method is proposed,which uses the change in negative-sequence voltage on the low-voltage side of a transformer as the starting criterion for disconnection protection. According to the ratio of zero-sequence impedance to positive-sequence impedance,the disconnection protection action criterion for voltage action value and the short-circuit blocking method based on the sudden change in the high-voltage side phase current of the transformer are adaptively adjusted. Finally,a single-phase disconnection fault simulation model under various conditions of 110 kV line is established,and simulation results verify the theoretical correctness and feasibility of the proposed method.

关 键 词：110KV输电线路 单相断线故障 断线保护 自适应识别 系统阻抗 

分 类 号：TM771[电气工程—电力系统及自动化]