防雷装置接受雷击时，雷电流沿着接问器、引下线和接地体流入大地并且在它们上面产生很高的电位，如防雷装置与建筑物内外的设备之间绝缘距离不够时，两者之间会发生放电现象，这种情况称为反击，反击的发生可引起电流，设备绝缘被破坏，金属管道被烧穿，甚至引起火灾、爆炸及? When a lightning protection device receives a lightning strike, lightning current flows into the earth along the receiver, the down conductor, and the grounding body and generates a very high potential on them. When the insulation distance between the lightning protection device and the equipment inside and outside the building is not enough, Discharge between the two will occur, this situation is called counterattack, the occurrence of counter-attack can cause current, equipment insulation is destroyed, metal pipes are burned through, and even cause fire, explosion and?