小电流接地配电网馈线单相接地故障零序阻抗特性分析  

The analysis of zero-sequence impedance characteristics of feeder in distribution system with neutral point non-effective grounding

作　　者：李纳纳 王宾[2] LI Nana;WANG Bin(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255049,Shandong,China.;State Key Lab of Control and Simulation of Power Systems and Generation Equipments(Dept.of Electrical Engineering,Tsinghua University),Beijing 100084,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049 [2]电力系统及发电设备安全控制和仿真国家重点实验室(清华大学电机系),北京100084

出　　处：《电测与仪表》2024年第6期58-64,共7页Electrical Measurement & Instrumentation

基　　金：国家重点研发计划项目(2017YFB0902800);国家电网有限公司科技项目(SGTYHT/16-JS-198)。

摘　　要：文章以暂态零序特征为着眼点,从频域角度对小电流接地系统发生单相接地故障后的特性进行详细探讨。从线路入端零序阻抗这一随频率变化的特征量入手,深入挖掘了配电网系统中各馈线零序阻抗的阻抗特性,详细探讨了零序阻抗的幅值、相角随频率的变化规律,并针对不同的中性点接地方式以及线路是否健全加以分析,为更好地利用零序暂态信号,提高故障检测正确率夯实了基础。最后通过PSCAD搭建仿真模型验证了该特性。Based on the transient zero-sequence characteristics,this paper studies the zero-sequence transient characteristics of low current grounding system in frequency domain.Starting from the characteristic variable of zero-sequence impedance at the line inlet which changes with frequency,this paper deeply excavates the impedance characteristics of zero-sequence impedance of each feeder in the distribution network system,discusses the variation law of amplitude and phase angle of zero-sequence impedance with frequency in detail,and analyzes different neutral grounding modes and whether the line is sound or not,so as to make better use of zero-sequence transient signal and improve fault diagnosis The correct rate of detection lays a solid foundation.Finally,a simulation model is built by PSCAD to verify the characteristics.

关 键 词：小电流接地 暂态 单相接地故障 零序阻抗 仿真 

分 类 号：TM711[电气工程—电力系统及自动化]