同塔双回输电线路接地故障点定位方法研究

Abstract

同塔双回输电线路是解决输电线路架设占用土地、跨越民房等引起的与城镇规划建设、居民生活之间的矛盾的有效方法，可是，一旦发生故障，如何更加精确的定位故障位置是其主要的突出问题。本文正是基于此，并考虑同塔双回输电线路的磁偶对所测数据的影响，介绍了一种不受磁偶影响就可以对故障点进行精确定位的方法，即基于S变换利用故障相电流信号的能量与对应的电压平均值来对同塔双回输电线路故障进行检测与定位的方法。并以A相接地故障为例进行了研究和分析，最后通过应用PSCAD软件进行建模和仿真，进一步验证了该方法的有效性，也为后续研究同塔多回输电线路的故障奠定了基础。 Double circuit transmission lines on the same tower is the effective method to solve the occupied land which was erected by the transmission lines, across houses and so on, which caused the contradiction between the urban planning and construction and the lives of the residents. However, in the event of a failure, the main outstanding issue is how to locate the fault more accurately in the case of the effect of the same tower double circuit transmission lines of magnetic coupling on the measured data. The principle of the method is based on S transformation to utilize the energy of the fault phase current signal and the corresponding average voltage to detect and locate the fault of the same tower transmission line. A phase to earth fault as an example is researched in this paper and then the modeling and simulation through the application PSCAD is conducted. Further, the effectiveness of the proposed method is verified, meanwhile, it will lay a foundation for researching on the more towers of transmission line fault.