基于长时窗线性拟合的导线触树故障起始时刻估计方法  

Method for estimating initiation time of wire-tree contact faults based on long-time window linear coupling

作　　者：王隽 雷杨 王耀 赵伟同 梁栋[3] WANG Juan;LEI Yang;WANG Yao;ZHAO Weitong;LIANG Dong(State Grid Hubei Electric Power Co.,Ltd.,Shennongjia Power Supply Company,Shennongjia 442499,China;State Grid Hubei Electric Power Company Electric Power Research Institute,Wuhan 430070,China;Shandong University of Technology,Zibo 255000,China)

机构地区：[1]国网湖北省电力有限公司神农架供电公司,湖北神农架442499 [2]国网湖北省电力有限公司电力科学研究院,湖北武汉430070 [3]山东理工大学,山东淄博255000

出　　处：《供用电》2024年第11期51-59,共9页Distribution & Utilization

基　　金：山东省自然科学基金(ZR202111180180)。

摘　　要：针对架空导线单相触树接地故障发生时刻难以估计的问题,搭建10 kV导线触树真型试验平台,通过观察试验现象厘清故障发展机理,归纳基于温升机理的故障零序电流上升共性特征,提出一种基于零序电流有效值长时窗线性拟合的导线触树故障起始时刻估计法。仿真和试验结果表明,相比于传统阈值法,该方法在故障起始时刻的估计误差最高可降低84.51%,为森林火灾责任认定提供了重要的理论支撑。To address the challenge of estimating the occurrence time of tree contact single-phase-to-ground fault in overhead conductors,a 10 kV conductor-to-tree real-scale test platform was established.By observing the experimental phenomena,the fault development mechanism was elucidated,and the common characteristics of fault zero-sequence current rise based on the thermal effect mechanism were summarized.A method for estimating the fault initiation time of conductor-to-tree contact based on the long-time window linear coupling of the effective value of zero-sequence current was proposed.Simulation and experimental results indicate that,compared to the traditional threshold method,this approach reduces the estimation error of the fault initiation time by up to 84.51%.It provides important theoretical support for the determination of responsibility in forest fires.

关 键 词：单相触树接地故障 零序电流 森林火灾 故障时刻估计 线性拟合 

分 类 号：TM71[电气工程—电力系统及自动化]