Company installed lightning protection facilities, there are lightning rod, lightning eliminator, early discharge lightning rod, CPD direct lightning protection device, several products to be selected, which is better?
Work principle: mainly by the exciter from the electric field of nature to absorb and store energy, lightning rod grounding, so that it has good electrical connection with the earth, in the equipotential state. When lightning occurs before the electric field strength will increase rapidly, the difference between Yu Leiyun and the earth potential is roughly the excitation potential between the rod and the needle tip, the voltage between them down rapidly will cause the increase in tip ignition, and the ionized air around the tip of the formation of tip discharge phenomenon, resulting in an early rise the pilot to guide, leading to the change of thunder down, the lightning point leads to its accurate and fast and safe lightning safety discharge to the earth, early discharge lightning arrester to avoid the traditional "shielding" and "swipe" phenomenon.
Working principle: in the lightning electric field, when the tip field reaches a certain value, the surrounding air free, under the action of electric field force to leave, and replace other air molecules that have and be free. Thus, there is an ionic current flowing from the tip of the metal to the periphery. With the increase of potential, the ionic current increases exponentially. When lightning appeared in the eliminator and the protected equipment over the eliminator, and near the land were induced with opposite polarity charge thundercloud charge. An ionization device many needle electrode, so that a large number of charge of the earth in the lightning field, the needle electrode is transmitted, moving toward the direction of the cloud and thunder, lightning, field weakening, so as to prevent the object to be protected from lightning.
Working principle: in a thunderstorm, building over charged clouds, lightning and are at the top of the tall building on a large number of induction charge, due to lightning needle is pointed, so the electrostatic induction, the tip conductor always gathered the most charge. In this way, the lightning rod gathers most of the charge. The lightning rod also forms a capacitor with these charged clouds. Because of its sharp tip, the two plate of the capacitor is facing a small area, and the capacitance is very small, that is to say, it can hold very little charge. And it brings together most of the charge, so when there is more charge on the clouds, the air between the lightning rod and the cloud is easily broken down and become a conductor. Thus, the electrified cloud layer forms a passage with the lightning rod, and the lightning rod is grounded, and the lightning rod can lead the charge on the cloud to the ground, so that it does not pose a danger to the high-rise building and ensures its safety.
