基于ATP-EMTP仿真计算的10 kV配电线路地线架设方式

Ground Wires Installation Method of 10 kV Distribution Lines Based on ATP-EMTP Simulation Calculation

针对10 kV配电线路地线,对比不同架设方式下线路耐雷水平的变化情况,提出合理的最优架设方式。建立了基于ATP-EMTP的感应雷过电压计算模型,分别仿真计算了地线架设于导线上方和下方两种典型情况下的线路耐雷水平变化情况。计算结果表明,地线架设于导线上方、地线架设于导线下方后线路耐雷水平分别为30.8 kA、33.2 kA,均较不架设地线的线路耐雷水平20.8 kA有较大提高;地线与三相导线平均距离越近,耐雷水平越高,建议地线架设于导线下方电杆位置上,防护效果及施工成本综合最优;云南实际线路运行效果也验证了仿真结论,架设地线后的线路感应雷跳闸率由21.45次/(100 km•a)下降到13.67次/(100 km•a)。研究成果为10 kV配电线路架设地线方式提供了科学化指导建议。

According to the ground wire in 10 kV distribution lines,the passage made comparison of lightning resistance level changes in different installation method,and proposed the best reasonable method.By lightning induced voltages model building based on EMTP,the lightning withstand level of two typical situation were calculated,which the ground wires were on top the conductor and under the conductor.The results show that the lightning withstand level were 30.8 kA and 33.2 kA in the two installation methods,which were greatly improved comparing with the level of 20.8 kA without ground wires.As the ground wires were closer the lines,the higher the lightning withstand level.It is suggested that the ground wires should be installed under the conductor,with the best protection effect and construction cost.The simulation results were verified by the actual line operation in Yunnan Province.After the ground wires were erected,the induced lightning trip-out rate drops from 21.45 times/(100 km•a)to 13.67 times/(100 km•a).The research results provide scientific guidance and suggestions for the way of setting up ground wires of 10kV distribution line.