10kV架空绝缘导线防雷击断线措施研究

Research on Protection Measures against Wire Breakage Caused by Lighting Stroke in 10 kV Overhead Insulated Conductors

架空绝缘导线在配电网中应用广泛且已成为主流。但在其实际运行中,雷击绝缘导线后断线概率较高,因此,探究行之有效的绝缘线防雷措施对促进配电网的健康发展具有非常重要的意义。通过对所在单位2010—2013年10k V配电网线路雷击跳闸次数进行统计分析,印证了采用绝缘子改造、变电站改用中性点经消弧线圈接地运行方式以及在绝缘导线上加装防雷金具三种方式对架空绝缘导线防雷的有效性,所提措施具有有效的推广实用价值。

Overhead insulated conductors are widely applied in the distribution network and has become the mainstream. But in the actual operation,the breakage of insulated conductors caused by lightning stroke has a higher probability. Therefore,to explore the effective protection measures against lightning for insulated wires has a very important significance for promoting the healthy development of the distribution network. A statistical analysis is carried out for the times of lightning trip-out of 10 k V distribution network from 2010 to 2013. The effectiveness of three ways are confirmed for the lighting protection,that is,transforming the insulators,using neutral ground via arc extinguishing coil in substation and mounting lightning fittings in insulating conductors. The proposed protection measures against lightning for overhead insulated conductors have the effective practical value.