基于单端行波法的配电网混合线路波头组合式故障测距方法  

Based on single-ended traveling wave a head combined fault location method about distribution network the hybrid

作　　者：李雪云[1] 刘青[1] 李丽英[2] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]华北电力大学科学技术研究院,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2014年第5期55-61,共7页Journal of North China Electric Power University：Natural Science Edition

摘　　要：由于城市土地资源紧缺,及受周围建筑物的影响,如今城市输电线路大多采用地下电缆线路,导致了架空线-电缆混合线路的大量出现。针对110 kV及以下电压等级的中低压架空线-电缆混合线路,提出了基于单端行波法的配电网混合线路故障测距方法。利用混合线路行波的折反射波过程,对故障电流信号进行经验模态分解及波头相关性分析,进行初步故障测距;并利用波头组合式匹配方法,实现混合线路最终故障测距。最后利用故障电压信号对故障测距结果进一步验证,以提高利用电流行波信号测距的准确性。仿真结果表明,所提出的配电网混合线路行波故障测距方法实用,测距成本低,能够准确测量出故障位置。Due to the shortage of urban land resources,urban transmission line now mostly uses the underground cable lines,which leads to a mass of overhead lines- cable hybrid lines. According to the characteristic of overhead lines-cable hybrid lines in the voltage level of 110 kV and below,this paper proposes a method of hybrid circuit fault location. With using the process of reflection wave,the fault current signal is analyzed by the empirical mode decomposition and correlation analysis of wave head. And use the wave front sectional matching method,to realize the hybrid fault location in the end. Finally using the fault voltage signal further verification,it improves the accuracy of ranging. Simulation results show that the proposed method is practical,range of low cost,accurate with measuring the fault location.

关 键 词：配电网 混合线路 故障测距 EMD分解 相关系数分析 波头组合 

分 类 号：TM77[电气工程—电力系统及自动化]