基于Blackman-Harris窗的110 kV输电电缆局部故障定位研究

Research on Local Fault Location For 110 kV Transmission Cable Based onBlackman-Harris Window

为解决传统频域反射法(frequency domain reflectometry, FDR)在定位110 kV输电电缆微弱局部故障时效果不佳的问题,提出了一种基于Blackman-Harris窗的电缆局部故障频域反射定位技术。首先介绍了基于频域反射法的局部故障定位理论及模型;其次基于该模型,在定位局部故障时引入了一种形式简单且性能优越的Blackman-Harris窗,提高了局部故障位置识别灵敏性;最后进行仿真分析,结果表明,与其他常见窗函数相比,所提方法在定位局部故障位置时效果明显,可为存在类似问题的供电公司提供参考。

In order to solve the problem that the traditional frequency domain reflectometry(FDR)method has poor effect in locating the weak local fault of 110 kV transmission cable,it proposes a FDR location technology for cable local fault based on Blackman-Harris window.Firstly,it introduces the theory and model of local fault location based on FDR.Secondly,based on the model,a Blackman-Harris window with simple form and superior performance is introduced to when localing fault location identification.Finally,the simulation analysis results show that compared with other common window functions,the proposed method is effective in locating local faults and can provide reference for power supply companies with similar problems.