基于扩展相分量法的OPGW系统接地短路电流计算

摘要

在架空输电系统中,光纤复合架空地线(OPGW)的应用越来越多.在OPGW线分布的短路电流值对OPGW线的设计和选型、架空输电线路的安全运行都有着重要的影响.由于传统相分量模型能够反映出各导线间的相互影响关系,文章在传统的相分量的基础上,对其进行了改进,即考虑两者之间的相互作用,将相导线和OPGW线作为一个整体,同时采用一致的模型进行分析.这种扩展相分量模型能够充分考虑线路不同杆塔型号造成的互感变化、OPGW线是否逐塔接地和OPGW线是否分段绝缘运行的情形,能够准确计算发生单相接地短路时,OPGW线和相线上短路电流等沿线分布的电气量.文中算例计算结果与EMTP仿真结果的对比,验证了文章计算的正确性.文章提出的方法计算准确,为架空输电线路沿线短路电流的分布提供了量化计算的依据,并且已经在电力工程设计中得到了应用.%OPGW is the abbreviation for the optical fiber composite overhead ground wire.The distribution of the current on OPGW has a significant influence on the designing and selecting of the OPGWs,as well as its safe operation.We apply the improved phase component method to analyze the quantified calculation of the current flowing on the OPGW lines with the asymmetric short-circuit.Traditional phase component method usually regards the phase wires as analysis system.The improved phase component method is on basis of the traditional phase component method and takes the OPGWs into consideration,resulting in forming the phase wires and OPGWs as a complete system.In order to prove the correctness of the theory and calculation results,this paper compares the results with those from EMTP simulation software.This theory provides a reference to calculate the fault currents along the transmission line.At last,the conclusion has been verified in an actual project example.