基于纵向阻抗的输电线路故障测距研究-电气技术.PDFVIP

基于纵向阻抗的输电线路故障测距研究 1 1 2 2 李江川 王 勇 周利兵 张 东 （1. 国网新疆电力公司福海县供电公司，新疆 福海 836400 ； 2. 国网新疆电力公司电力科学研究院，乌鲁木齐 830011 ） 摘要 本文以纵向阻抗为基础推导了一种利用双端电气量测量故障距离的计算公式，在公式 推导后分析了系统解耦对故障测距的影响，分析结果表明系统解耦对推导出的故障距离计算公式 影响不大。然后利用EMTP 对750kV 沙洲至哈密输电线路进行了设置不同接地故障后的仿真分析， 从仿真得到的电流电压参数利用本文推导的公式计算出故障距离与设置的故障距离相比较，比较 结果验证了本文推导的故障距离计算公式的具有较高的准确度且不受故障类型的影响，同时也仿 真分析了过渡电阻对本文推导公式的影响，仿真分析结果表明过渡电阻几乎不对本文推导的公式 造成影响，验证了所推导公式的有效性和实用性。 关键词：双端量法；线性变化；纵向阻抗；故障测距；解耦算法 Study on Fault Location of Transmission Line based on Longitudinal Impedance Li Jiangchuan 1 Wang Yong1 Zhou Libing2 Zhang Dong2 (1. State Grid Electric Power Company Xinjiang Fuhai County Power Supplycompany, Fuhai, Xinjiang 836400; 2. State Grid Electric Power Research Institute of Xinjiang Electric Power Company, Urumqi 830011) Abstract In this paper, based on longitudinal impedance derived utilizing a double-ended electrical fault distance measurement is calculated in the derivation of, analyzes the impact of decoupling on the fault location, the analysis showed that the decoupling of the deduced the fault has little effect on the distance formula. Then use EMTP sandbar on 750kV transmission line to Hamilton for the simulation analysis set different ground fault, the current and voltage parameters obtained from the simulation using this article derived formula to calculate the distance to the fault distance and set the fault compared to the comparison results validated this article derivation of fault distance calculation formula has influence and is not the fault type high accuracy, but also the impact of th