海底电缆–架空线B型混合线路行波故障测距新方法

Abstract

分析了海底电缆–架空线混合线路发生故障以后行波的传播特性，并提出了一种针对海底电缆–架空线B型混合输电线路的行波测距方法。首先把原有的B型三段混合输电线路分解组合成两段A型混合输电线路，先利用每段A型混合线路两端监测装置监测到的故障初始行波浪涌到达监测点的时间差与整定时间进行比较，对故障区段初步判断，依据监测点接收行波的时间再根据单端原理得出准确的测距结果。此方法不但可以消除单端测距方法故障区段判别中对第二个波头性质的识别的难题，并且可消除双端测距方法计算故障距离时两端间不能精确同步和线路长度对测距结果的影响。PSCAD仿真实验表明，本文所提出的关于海底电缆–架空线混合输电线路故障行波测距方法是可靠的，且测距精度得到了有效提高。 After analyzing the propagation characteristics of the traveling wave after the failure of the sub-marine cable-overhead line hybrid line, a fault location method through traveling wave for the hybrid transmission line is proposed. First, the original B type hybrid transmission line is decom-posed into two hybrid transmission lines of type A. Then the time difference between the two monitoring device located in the endpoints of each A type hybrid line is used to make a preliminary judgment of the fault section. Finally an accurate fault location result is made according to the principle of single-end method. This method eliminates the difficult problem of the identification of the second wave heads in the single-end fault location method, and it also eliminates the influence of the out-sync of time and the influence of the line length which is given of the two double-end fault location method. PSCAD simulation experiments show that the presented the Fault Location Method through Traveling Wave for the Submarine Cable-Overhead Line Hybrid Line is reliable, and the accuracy of fault location has been effectively improved.