配电网馈线零序电流随过补偿度动态调节的变化特性分析

发布时间：2018-01-13 14:13

本文关键词：配电网馈线零序电流随过补偿度动态调节的变化特性分析　出处：《电力系统自动化》2017年13期 　论文类型：期刊论文

【摘要】：分析了过补偿度动态调节过程中,不同故障过渡电阻及馈线对地电容参数下故障馈线和非故障馈线零序电流的变化特性。建立了馈线线路零序电流关系表达式,在过补偿区域、欠补偿区域和全区域内动态调节过补偿度,给出了多场景下馈线零序电流变化曲线。分析结果表明:经过渡电阻单相接地故障下,在过补偿度小于零且大于故障线路对地电容占母线所有出线对地电容之和比例的相反数区间,故障线路与非故障线路零序电流幅值变化特性一致;在过补偿度大于零区间,当过渡电阻大于边界值时,两者变化特性一致,该边界值与馈线线路对地电容成反比。研究结果为残流增量法接地故障选线的改进提供了重要的理论依据。
[Abstract]:The variation characteristics of zero sequence current of fault feeder and non fault feeder under different fault transition resistance and feeder to ground capacitance parameters are analyzed in the process of dynamic adjustment of over compensation degree. The expression of zero sequence current relationship of feeder line is established. In the over-compensation region, the undercompensated region and the whole region, the dynamic adjustment of over-compensation degree is given, and the zero sequence current variation curve of the feeder line is given in multi-scene. The analysis results show that: after the single-phase earthing fault of the crossing resistance. When the over-compensation degree is less than zero and the ratio of fault line capacitance to ground capacitance is greater than the sum of all outline-to-ground capacitors, the variation characteristics of zero sequence current amplitude between fault line and non-fault line are consistent. When the over-compensation degree is greater than zero, when the transition resistance is greater than the boundary value, the variation characteristics of the two are consistent. The boundary value is inversely proportional to the ground capacitance of the feeder line. The results provide an important theoretical basis for the improvement of grounding fault line selection by the residual current increment method.
【作者单位】：武汉理工大学自动化学院;南京磐能电力科技股份有限公司;武汉电力职业技术学院;
【分类号】：TM862
【正文快照】： 上网日期:2017-05-16。0引言按国家能源局统一部署,“十三五”期间,中国配电网将进入大规模建设改造时期,其明确要求城市电网进行电缆化改造[1-2],导致配电网单相接地故障电流不断增大。为使单相瞬时性接地电弧自动熄灭,配电网中性点往往改用经消弧线圈接地方式[3]。此时一旦

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