基站低压大容量避雷器损坏原因分析

Analysis of Damage Reason of Base Station Low Voltage and Large Capacity Arrester

大容量避雷器的通流量是:10 kV高压100 kA,380 V低压65 kA,分别是电力部门安装标准避雷器容量的20倍和43.3倍;但基站变压器和设备并没有因安装了大容量的避雷器而减少损坏,低压避雷器的损坏反而增加了,雷击时,标准容量的低压避雷器损坏率是25%,而大容量避雷器的损坏率是100%。文中根据基站变压器SPD在雷电作用下电荷感应的规律,指出了大容量低压避雷器损坏的原因。

The flow rate of large capacity arrester is:10 kV High Voltage 100 kA,380 V low voltage 65 kA,which are 20 times and 43.3 times of the standard arrester installed by the power sector.However,the base station transformer and equipment did not reduce the damage due to the installation of large capacity arrester,but the damage of low-voltage arrester increased.When lightning strikes,the damage rate of low-voltage arrester with standard capacity is 25%,while that of large capacity lightning protection is 25%The damage rate of the arrester is 100%.According to the law of charge induction of SPD in base station transformer under the action of lightning,the cause of damage of large capacity low voltage arrester is pointed out.