35kV电缆-架空线金属护层电流初始行波特性研究

35kV cable-overhead lines metal sheath line current initial porter research

针对变电站35kV电缆-架空线出线不同位置发生单相接地故障时,对不同线路金属护层电流初始行波特性进行研究.利用PSCAD、MATLAB仿真软件进行仿真分析,结果表明小电流接地系统单相接地故障发生在电缆位置或者架空线位置时,无论是单芯电缆还是三芯电缆它们的金属护层电流初始行波极性会有明显的区别,对小电流接地系统单相接地故障选线有一定的参考价值.

When single-phase grounding faults occur in different positions of 35kV substation cables and overhead lines, the current initial porter of metal protective layer for different lines is studied. And PSCAD and MATLAB simulation softwares are used for simulation analysis. Simulation results show that when a large number of small current grounding system of single-phase grounding fault occurs in the cable or overhead lines location, whether it is a single-core cable metal sheath or three-core cable, their initial traveling wave current polarities will significantly changed. This will provides certain reference value for single-phase grounding fault line selection if small current grounding system.