10kV系统单相接地故障引起铁磁谐振事故分析

Analysis of Ferroresonance Accident in 10kV Power System Caused by Single-Phased Grounding Fault

巴彦淖尔地区电网布拉格变电站发生10kV系统单相接地故障,在选线拉路后电容参数与电感参数相匹配,引发系统铁磁谐振。经分析,确定原因为变电站出线由杆塔更换为入地电缆后系统电容增大,且10 kV母线未安装消弧线圈。为此提出消弧线圈法、4TV法等预防系统铁磁谐振措施。

Single-phase grounding fault occured in 10kV system of Prague Substation in Bayannur area power grid. Capacitance parameter matching inductance parameter after pulling off fault line, while the ferroresonance accident appeared in the system. The reason was that the system capacitance increased after the substation outgoing line was changed from tower to ground cable, and no arc suppression coil was installed on 10kV bus. The methods of arc suppression coil and 4TV were put forward to prevent the ferroresonance in the system.