10kV架空导线单相触树接地故障模型及其检测方法  

Model and Detection Method for Tree-contact Single-phase-to-ground Faults on 10kV Overhead Lines

作　　者：梁栋 徐丙垠[2] 唐毅 王鹏玮 王玮[2] 孙中玉 LIANG Dong;XU Bingyin;TANG Yi;WANG Pengwei;WANG Wei;SUN Zhongyu(School of Agricultural Engineering and Food Science,Shandong University of Technology,Zibo 255000,Shandong Province,China;School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,Shandong Province,China;State Grid Shandong Electric Power Company,Jinan 250000,Shandong Province,China)

机构地区：[1]山东理工大学农业工程与食品科学学院,山东省淄博市255000 [2]山东理工大学电气与电子工程学院,山东省淄博市255000 [3]国网山东省电力公司电力调度控制中心,山东省济南市250000

出　　处：《中国电机工程学报》2021年第15期5221-5231,共11页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2016YFB0901300)。

摘　　要：针对现有的高阻故障模型难以描述导线触树故障的过渡电阻缓变特征的问题,在分析导线触树故障物理机理的基础上,建立了基于实际物理过程的等效模型。试验结果表明,该模型能够良好模拟不同尺寸接地树木下过渡电阻的短时非线性特性及长时缓变特性。以模型为基础,提出基于故障分量幅值的长时变化趋势进行故障判断的方法。仿真结果表明,该方法的耐过渡电阻能力可达17kΩ以上,在实际线路试验中,导线触树故障检出时过渡电阻约51kΩ。The existing high impedance fault(HIF)models cannot precisely describe the slow varying characteristics of tree-contact single-phase-to-ground faults(TSFs).A simulation model for TSFs was established based on the physical mechanism.Test results show the nonlinearity characteristics of the transition resistance in short time and the slow varying characteristics in long time are well matched in the calculations.Based on the built model,a detection method was proposed using the long-time variation trend of the magnitude of the fault vector.Simulations show the fault detection sensitivity of the method is over 17kΩ.A 51kΩ TSF was detected in field test.

关 键 词：导线触树故障 高阻接地故障 介质击穿 接触电阻 越限时间 

分 类 号：TM85[电气工程—高电压与绝缘技术]