基于暂态零序导纳值的谐振接地系统单相接地故障选线方法  

Single-Phase Grounding Fault Line Selection Method for ResonantGrounding System Based on Transient Zero-Sequence Admittance Value

作　　者：吴江雄 郑茂然[2] 王欣 李海锋[3] 罗会洪[2] WU Jiangxiong;ZHENG Maoran;WANG Xin;LI Haifeng;LUO Huihong(Guilin Power Supply Bureau of Guangxi Power Grid Co.,Ltd.,Guilin,Guangxi 541002,China;Power Dispatching and Control Center,CSG,Guangzhou 510663,China;School of Electric Power Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广西电网有限责任公司桂林供电局,广西桂林541002 [2]中国南方电网电力调度控制中心,广州510663 [3]华南理工大学电力学院,广州510640

出　　处：《南方电网技术》2024年第11期58-66,共9页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51977080);广东省基础与应用基础研究基金项目(2023A1515011035);广西电网有限责任公司科技项目(GXKJXM20222111)~~。

摘　　要：谐振接地系统削弱了故障线路和非故障线路的零序特征差异,为此提出了一种基于暂态零序导纳值的谐振接地系统选线方法。首先从理论上推导了单相接地故障下故障线路和非故障线路的暂态零序导纳公式,比较了两者的特征差异。在此基础上,构建了基于暂态零序导纳最大均值指标的单相接地故障选线方法。最后,基于PSCAD/EMTDC软件对所提方法的性能进行了全面的验证和测试。结果表明,所提方法具有耐受过渡电阻能力强的优势。仅需计算故障后半个工频周期内的暂态零序导纳,计算量小、速度快、易于实现。同时,在噪声干扰、电流互感器反接、网络拓扑结构变化、线路参数变化、采样频率变化等干扰因素下仍有较高的选线准确度。The zero-sequence characteristic difference between faulty line and healthy line is weakened by resonant grounding system,so a line selection method based on transient zero-sequence admittance is proposed in this paper.Firstly,the transient zero-sequence admittance formulas of faulty line and healthy line under single-phase grounding fault are deduced theoretically,and the characteristic differences between them are compared.On this basis,a single-phase grounding fault line selection method based on the maximum mean value index of transient zero-sequence admittance is constructed.Finally,based on PSCAD/EMTDC software,the performances of the proposed method are verified and tested comprehensively.The results show that proposed method has the advantage of strong resistance tolerance to the transition resistance.Only the transient zero-sequence admittance in half power frequency cycle after the fault needs to be calculated,so the calculation load is small,the speed is fast and the implementation is easy.At the same time,the line selection accuracy is still high under the interference factors such as noise interference,current transformer reverse connection,the changes in network topology,line parameters and sampling frequency.

关 键 词：单相接地故障 故障选线 暂态零序导纳 谐振接地系统 

分 类 号：TM773[电气工程—电力系统及自动化]