文章摘要
唐金锐,杨晨,程利军.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[J].电力系统自动化. DOI: 10.7500/AEPS20161114004.
Tang Jin-Rui,,.Analysis on Zero-sequence Current Variation Characteristic for Feeders of Distribution Network at Different Residual Current Compensation Factors[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20161114004.
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
Analysis on Zero-sequence Current Variation Characteristic for Feeders of Distribution Network at Different Residual Current Compensation Factors
DOI:10.7500/AEPS20161114004
关键词: 零序电流  消弧线圈  故障选线  故障定位  配电网
KeyWords: zero-sequence current  arc-suppression coil  faulty feeder identification  fault location  distribution network
上网日期:2017-05-16
基金项目:广东电网有限责任公司电力规划专题研究项目(036100QQ00160003)
作者单位E-mail
唐金锐 武汉理工大学自动化学院 tangjinrui001@126.com 
杨晨 武汉电力职业技术学院;武汉电力职业技术学院 627433866@qq.com 
程利军 南京磐能电力科技股份有限公司 chenglijun999@163.com 
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:
      Zero-sequence current variation characteristics of faulty and healthy distribution feeders with different fault resistances and earth capacities during the changing process of residual current compensation factor are analyzed. Firstly, the relational expression of zero-sequence current is given. Secondly, zero-sequence current variation curves of distribution feeders are presented for multi-parameter scenarios with residual current compensation factor varying in over-compensation, under-compensation and whole regions. The results show that once single-line-to-ground fault through resistance occurs, the zero-sequence current variation characteristic of faulty feeder is consistent with that of healthy feeder under following conditions: 1) residual current compensation factor is less than zero and greater than the opposite number of the ratio of faulty feeder’s ground capacitance to total ground capacitance of all feeders; 2) fault resistance is greater than the boundary value which is in inversely proportional to the ground capacitance of the feeder while the residual current compensation factor is greater than zero. The analysis results provide an important theoretical basis for remnant current increment method.
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