负荷线路断线引起消弧线圈接地系统过电压的分析与判别  

Analysis and Discrimination on Overvoltage in Arc-Suppression-Coil Earthed System Caused by Loaded-Line Breakage

作　　者：林春清 李春平 郭兆成 王严军 宋昆仲 

机构地区：[1]大连供电公司,辽宁省大连市116001

出　　处：《电网技术》2012年第9期275-280,共6页Power System Technology

摘　　要：为及时消除负荷线路断线引起的消弧线圈接地系统的过电压,对该过电压的产生机理、形式和判别方法进行了研究。首先对断线引起消弧线圈接地系统过电压的理论进行深入分析,给出了过电压的计算方法和变化形式;其次通过典型故障案例和计算实例对分析结果进行了验证;最后依据负荷断线过电压的典型性质特征提出了断线故障判别方法。分析结果表明:消弧线圈接地系统中,负荷线路断线会产生与断线相电源电势"同相"或"倒相"等多种形式的谐振过电压,该过电压的幅值和性质特征与线路所带负载变压器的负荷直接相关,同时亦受消弧线圈补偿方式的影响。To eliminate overvoltage in arc-suppression-coil earthed system caused by loaded-line breakage,the generation mechanism,waveform and discrimination of the overvoltage are researched.Firstly,the overvoltage in arc-suppression-coil earthed system caused by loaded-line breakage is theoretically analyzed in depth,and a method to calculate the overvoltage is given;secondly,the analysis results are verified by typical fault case and calculation example;finally,according to typical characteristic of overvoltage in arc-suppression-coil earthed system a method to discriminate line breakage fault is proposed.Analysis results show that in arc-suppression-coil earthed system,the loaded line breakage produces various types of resonance overvoltages,which are in-phase or reversed-phase to source voltage of the broken phase,the amplitude and property of the overvoltage are directly related to the load of the transformer in the line,and is influenced by compensation mode of the arc-suppression coil at the same time.

关 键 词：消弧线圈接地系统 负荷线路断线 过电压 

分 类 号：TM732[电气工程—电力系统及自动化]