How is lightning arrester protected by overvoltage?
First of all, the conductor of the arrester adopts copper iron alloy, so its conductor performance is limited, the reaction speed is only 200, delicate (uS). LEMP and the half peak velocity (maximum energy) is 20 (uS), subtle LEMP is faster than that of arrester, lightning arrester of the first into the ground, for two times, three times tend to react, direct leakage on the device. That is to say, two times, three of the arrester buildings has little or no effect.Second, after the LEMP is introduced, it will return from the ground to form an induced mine. Induction mines leak from all metal containing wires to the equipment (cable, power line, signal line, transmission line, etc.). Because lightning arrester is one-way, so it does not work on induction mine, induction mines can directly hit the equipment. What's more, the wire parts are often not equipped with arresters.Again, only 20% of the surge from the lightning and other external environment, 80% of the system from the internal operation, lightning arrester on the 80% does not play any role.
Also known as lightning protection, is a variety of power equipment, instruments and meters, communication lines, such as security protection device. When the electric circuit or communication lines because of outside interference peak current or voltage suddenly, the surge protector can in a very short time conducting shunt, so as to avoid damage to other equipment surge in the loop.
Lightning arrester is a kind of equipment that protects the substation from the shock wave of lightning. When the lightning incoming wave over the substation along the line arrester protection level, and the first discharge arrester, lightning current through the introduction of good conductor safety earth, using the grounding device to ray voltage limit in the protected equipment lightning below the level of the electrical equipment is to protect.
