Lightning arrester: lightning protection barrier for power system

In power and communication systems, lightning arresters are core devices to resist lightning damage, and they protect the stable operation of equipment like "safety guards."

Its working mechanism is ingenious and efficient: it is in an insulating state under normal voltage and does not interfere with system operation; when lightning causes overvoltage, it instantly switches to conduction mode, directing the strong lightning current into the earth, and quickly resets after the voltage returns to normal. This "smart switch" feature makes it a key line of defense for circuit safety. ​

Common lightning arresters can be divided into three categories:Tube-type lightning arresters rely on the coordination of internal and external gaps to achieve line protection by extinguishing the arc, and are mostly used in overhead lines; valve-type lightning arresters combine spark gaps and valve plate resistors, break down and discharge when overvoltage occurs, and maintain insulation when normal, which is suitable for transformers and other equipment; zinc oxide lightning arresters rely on excellent nonlinear characteristics and gapless design to make the response faster and the protection more accurate and are widely used in high-voltage power grids. ​

The application scenarios of lightning arresters are very wide. In the field of power transmission and transformation, it builds a lightning protection wall for transformers, switch cabinets, and other equipment; in communication base stations, it can effectively protect signal transceivers; even in industrial plants, it can protect precision instruments from induced lightning. ​

The selection and installation of lightning arresters must follow the specifications: match the parameters according to the system voltage level to ensure that the current capacity meets the lightning protection requirements; the installation location should be close to the protected equipment to shorten the lightning current path; regularly check the leakage current and aging degree to avoid protection failure due to performance degradation.

The small lightning arrester, with its unique technical principles and diverse types, has become an indispensable guarantee for the safe operation of modern infrastructure and provides solid support for the stability of power and communication networks.