光纤复合架空地线雷击电流数学模型的建立

Establishment of Mathematical Models of Lightning Current on OPGW

针对光纤复合架空地线(optical fiber composite overhead ground wire,OPGW)雷击断股的问题,指出雷击电流中的低幅长时间持续电流是OPGW断股的主要原因。建立雷击电荷转移量与雷暴日、地面落雷密度、线路雷击次数的函数关系,以此作为评估雷击能量的考核指标。考虑雷击电流中的冲击电流只能引起OPGW局部损伤,而长时间持续电流则可能造成OPGW的破坏,通过对目前常用脉冲冲击模型的修正,建立了OPGW雷击电流的数学模型,模型由冲击电流部分和长时间持续电流部分组成,总的电荷转移量等于实际雷击的放电量。模型可用于OPGW雷击破坏数量方面的研究,进而优化OPGW的设计。

Aiming at the lightning-induced strand breakage of optical fiber composite overhead ground wire （OPGW）, it is indicated that low-amplitude and long-time continuous lightning current is the main cause of strand breakage. The electric charge transfer of the lightning strike which has functional relationship with thunderstorm day, ground flashing density and lightning strike density is the main examination index of the lightning strike energy. A mathematical model of lightning current is established by modifying the common pulse model and considering that lightning pulse current causes only slight local damage of OPGW while the long-time continuous lightning current may causes strand breakage of OPGW. The model is composed of pulse current and long-time continuous current and the total electric charge transfer equals the electric discharge of the real lightning strike. The model can be used for quantitative study of OPGW damage caused by lightning with the view of optimizing the design of OPGW.