配网导线雷击断线机理与防护措施研究

Study on the mechanism and protection measures of lightning-struck wire breakage in distribution network

雷电活动频繁地区线路容易发生雷击故障导致导线断线,对电网安全稳定运行造成危害,而裸导线普遍应用于经济不发达的地区的配电网,时长发生雷击断线事故。本文先研究了裸导线断线过程,然后计算分析了雷电流能量对断线的影响,并基于PSCAD仿真研究了系统工频短流电流对断线的影响,最后,基于雷击裸导线机理的研究,提出了裸导线断线的防护措施,对10k V配电网导线断线防护有着重要的借鉴意义。

Overhead lines in areas with frequent lightning activities are prone to lightning strike fault,which leads to wire breakage, causing harm to the safe and stable operation of the power grid. Bare wires are generally used in the distribution network in economically underdeveloped areas, and lightning strike breakage occurs for a long time. This paper first studied the process of bare wire break line, and then analysis the influence of lightning current energy to break, and based on PSCAD simulation system short flow power frequency current influence on bolt, finally, based on the researches on the mechanism of the lightning conductor naked, bare wire break line protection measures are put forward, to 10 kv distribution network bare wire break protection has important significance.