电容器在低压输电线路防雷防护中应用的分析  

Analysis on Capacitor in Lightning Protection of Low-voltage Transmission

作　　者：李祥超[1,2] 王金虎[1,2] 唐宏科[1,2] 詹家亮 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044 [2]南京信息工程大学大气物理学院,南京210044 [3]南京普天鸿雁电器科技有限公司,南京210012

出　　处：《电瓷避雷器》2011年第5期85-89,共5页Insulators and Surge Arresters

基　　金：国家自然科学基金资助项目(编号:41075025)

摘　　要：通过对低压输电线路中并联接入电容器的理论分析,得出了当低压输电线路中有雷电感应过电压时,电容器能够降低雷电过电压的幅值;低压输电线路中有雷电波传输时,根据雷电波传输的折射、反射原理,电容器能够降低雷电波的陡度;电容器与电涌保护器并联组合使用,能够降低SPD的残压。进行的模拟雷电感应过电压以及模拟雷电流冲击试验验证了并联在低压输电线路中的电容器能够降低感应过电压的幅值、雷电波陡度以及降低SPD残压的作用。提出了在低压输电线路的雷电防护中,电容器与SPD并联使用能够更有效地提高电子、电气设备的防雷效果。Based on the theoretical analysis of capacitor which in paralled with low-voltage transmission lines, capacitor can reduce the amplitude of the lightning when there was lightning over-voltage induced in lines; according to the refracted and reflection principle of lightning wave transmission, the capacitor can reduce the steepness of the lightning wave when lightning over-voltage transmitted in lines; the way of capacitor in parallel with SPD can reduce the SPD residual voltage. The simulation of lightning induced overvoltage and simulation lightning current impulse test can verify capacitor which in paralled with low-voltage transmission lines can reduce the amplitude of induced overvoltage, lightning wave steepness and residual voltage, the method is proposed that in the lightning protection of low voltage lines, the method of capacitor in parallel with the SPD can improve protection effect of electronic＆ electrical equipment more effectively.

关 键 词：雷电波 电容器 感应电荷 波的折 反射 

分 类 号：TM862[电气工程—高电压与绝缘技术]