小电流接地系统故障选线分析

小电流接地系统的安全运行对配电网来说是很重要的,它的故障选线问题是关键.在配电网不同的运行方式下,分析了小电流接地系统的稳态故障特征,并对零序电流比幅比相法和五次谐波选线法,进行了仿真.仿真结果表明,在不同运行方式下2种方法可进行互补,可准确、快速地选线,但受到接地电阻和线路长短的影响,且零序电流也受到消弧线圈补偿作用的影响.

Analysis of Fault Line Selection in Small Current Grounding Power System

The safe operation of the small current grounding system is important for distribution networks and the fault line selection is key.Based on different operational modes of the distribution,the characteristics of steady-state fault of the small current grounding power system were analyzed and simulation was done on the line selection methods of the zero sequence current comparing phase and amplitude and the fifth harmonic.Simulation results showed that the two kinds of methods in different operational modes could be complementary,select fault line exactly and rapidly.But they were influenced by grounding resistance and line length,and zero sequence current was also affected by coil compensation.