一种适用于同塔双回线路的双端故障测距方法  

Ranging Method Using Fault Positive and Negative Sequence Components

作　　者：石恒初 卢佳 杨远航 杨桥伟 游昊 赵明 解良 朱青成 Shi Hengchu;Lu Jia;Yang Yuanhang;Yang Qiaowei;You Hao;Zhao Ming;Xie Liang;Zhu Qingcheng(Yunnan Electric Power Dispatching and Control Center,Kunming,650011;Yunnan Power Grid Co.,LTD.Electric Power Research Institute,Kunming,650217)

机构地区：[1]云南电力调度控制中心,昆明650011 [2]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《云南电力技术》2021年第2期11-14,18,共5页Yunnan Electric Power

摘　　要：利用故障录波全量信息的双端测距方法,方法简单可靠,但算法使用了零序分量,测距结果受零序阻抗误差以及零序分量偏差的影响。本文提出一种利用故障正、负序分量的输电线路两侧故障录波测距方法,依据线路两侧同步采集得到的三相故障电压、电流分解出正、负序分量,利用正、负序分量开展双端测距,消除零序分量影响,并提出了滑窗计算测距的具体方法,进一步提高测距精度。该方法较全量测距算法稍显复杂,但从原理上消除了同塔线路互感对测距结果的影响,使得测距结果更加准确,可作为全量测距算法的有益补充。以某一线路单相故障为例对同步方法进行验证。Based on the method of synchronizing fault recording data on both sides of the pre-sequence line,this paper proposes a fault recording and distance measurement method on both sides of the transmission line using the positive and negative sequence components of the fault,based on the three-phase fault voltage and current sampling obtained by synchronous collection on both sides of the line Instantaneous value,in a data window with a power frequency or half a power frequency cycle as the length,extract the three-phase positive sequence voltage current and negative sequence voltage current on both sides of the line,and use the positive sequence and negative sequence fault network of any phase,Calculate the fault point under the data window to the positive and negative impedance values on both sides.During the period from the initiation of the fault to the time when the switch on one side of the line is disconnected,a series of positive and negative impedance values from the fault point to both sides of the line can be obtained by sliding the data window one by one sampling point,and the above series of positive and negative impedance values are obtained by data processing Fault location results.In principle,this method eliminates the effects of factors such as transition resistance,line mutual inductance on the same tower,and multi-point grounding of the secondary circuit of the voltage transformer on the ranging results,making the ranging results more accurate.Take a single-phase failure of a line as an example to verify the synchronization method.

关 键 词：数据同步 数据窗 正负序分量 数据处理 

分 类 号：TM74[电气工程—电力系统及自动化]