The main way of lightning strike in the rainy season

In the thunderstorm season, severe storms and thunder and thunder occur from time to time, causing some building intercom doors to be damaged by lightning many times, causing great inconvenience to users and causing great economic losses. Among them, household electronic products are prone to lightning strikes: power boxes, circuit boards, intercoms, and the main ways of lightning strikes are:

(1) Direct lightning strike. Direct lightning strikes are lightning strikes directly on objects. Thunderclouds close to the ground induce opposite charges on the protrusions. When the electric field strength between the thundercloud and the protrusions on the ground reaches the air breakdown strength, the lightning strikes. Through lightning discharge, this kind of thundercloud direct breakdown discharge to ground protrusions is called direct lightning. High buildings and their sides are susceptible to direct lightning strikes. Direct lightning strikes on the sides of buildings can be called side lightning strikes.

(2) Induction mine. Induced by conductive objects such as metal objects next to the lightning strike facility, indirectly hit the object. Lightning induction is divided into electrostatic induction and electromagnetic induction. The formation of electrostatic induction is due to the fact that when the thundercloud approaches the ground, it induces a large number of opposite charges on the top of the protrusions on the ground. When the thundercloud and other thunderclouds or other objects are discharged, the charge accumulated on the top of the protrusion suddenly loses its restraint, exhibits a high voltage, and propagates in the form of lightning waves at high speed. The formation of electromagnetic induction is due to the direct lightning current generating a rapidly changing strong magnetic field in the surrounding space, which induces a high voltage on nearby metals. The induction lightning is not as violent as the direct lightning, but it has a much higher probability of occurring than the direct lightning. Because direct lightning strikes only occur when the thundercloud strikes the ground, it will cause disaster to the ground, while the induction thunder may occur regardless of the thundercloud strikes the ground, or between the thundercloud and the thundercloud. A lightning flash can simultaneously induce a lightning overvoltage phenomenon in a relatively large range and multiple small parts, and this induced high voltage can be transmitted to a long distance through metal wires such as signal lines, power lines, and telephone lines, causing lightning damage. The scope is expanded.