The difference between surge protector and arrester

- May 12, 2019-

A surge protector refers to a building that forms a Faraday cage together with a lightning rod and a grounding bar to prevent damage to the building. The basic principle of the surge protector is to introduce a lightning strike electromagnetic pulse (LEMP) into the ground for digestion. But why are there still a large number of buildings and their equipment damaged by lightning after installing the surge protector?

First, the conductors of the surge protector are made of copper-iron alloy, so the wire performance is limited and the reaction speed is only 200 microseconds (uS). The half-peak speed (energy maximum) of LEMP is 20 microseconds (uS), which means that LEMP is faster than the surge protector, so that the surge protector will introduce the first direct lightning strike to the ground for the second time. Thunder and three thunders often do not respond, and direct leaks hit the equipment. In other words, the surge protector has little effect on the second and third thunder.