特高压长线路单端阻抗法单相接地故障测距  

An Impedance Fault Location Algorithm for UHV Long Transmission Lines with Single-line-to-ground Faults

作　　者：王宾[1] 董新洲[1] 薄志谦[2] Andrew KLIMEK 

机构地区：[1]清华大学电机系电力系统及发电设备安全控制和仿真国家重点实验室,北京市100084 [2]阿海珐输配电有限公司,英国斯塔福德郡ST174LX

出　　处：《电力系统自动化》2008年第14期25-29,共5页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2004CB217906);国家自然科学基金资助项目(50377019);高等学校博士学科点专项科研基金资助项目(20060003033);中国博士后科学基金资助项目(20060390046)~~

摘　　要：特高压长线路分布电容大,故障后波过程明显,基于集中参数模型的单端阻抗法故障测距无法适用。针对该问题,采用分布参数建模,经分析证明观测点处的负序电流可以很好地模拟故障支路负序电流(故障点电压)的相位信息。基于此,提出了一种新的阻抗法故障测距方法。该方法在故障点电压瞬时值过零点时刻计算测量阻抗,理论上不受过渡电阻的影响;基于分布参数模型,不受分布电容电流的影响。理论分析和仿真结果表明:所提出的算法具有较高的测距精度,能够满足现场应用的要求。Ultra-high-voltage （UHV） transmission lines （over 750 kV） normally have larger shunt capacitance and longer transmission radius, which impose limitations of direct application of traditional impedance algorithm. A novel impedance fault location algorithm is proposed for UHV transmission lines with single-line-to-ground faults due to higher voltage level than 750 kV. It is based on the precondition that the negative sequence current phase at meter location can precisely describe the phase information of negative current in fault path or fault voltage. The algorithm is immune to the influence of shunt capacitance with distributed parameters modeling for transmission line, and is not disturbed by fault resistance with fault location calculation at zero-crossing point of voltage at fault point. Theoretical analysis and simulation prove that the proposed method can guarantee good fault location accuracy, and fulfill the requirements in the field.

关 键 词：特高压 故障测距 分布参数 阻抗法 

分 类 号：TM773[电气工程—电力系统及自动化]