Function And Principle Of Lightning Arrester

The main function of Arrester is to protect electrical equipment from high transient overvoltage. Its working principle is to start quickly when the overvoltage reaches a certain value, introduce the overvoltage energy into the earth, and ensure the safety of electrical equipment. ‌

Function‌

As an important part of the power system, the function and role of the lightning arrester are crucial to protecting equipment and preventing accidents.
When the grid voltage rises to the action voltage of the lightning arrester, the device will start quickly to control the amplitude of the voltage increase within a certain range to ensure the safety of equipment insulation. ‌
In addition, it can effectively cut off the continuous current, prevent the system from grounding short circuit, and ensure the normal and stable operation of the power system. ‌
Principle‌

Core function‌: Release the energy of lightning or operating overvoltage to protect electrical equipment from transient overvoltage. ‌ Working process‌: In a high-voltage environment, the lightning arrester presents low impedance; in a low-voltage environment, it presents high impedance. When the intensity of the lightning shock wave exceeds the protection threshold of the lightning arrester, the lightning arrester will quickly start the discharge mechanism and safely introduce the lightning current into the earth through a dedicated conductor. ‌
Structural features: It is usually composed of a main component, an insulating base, a wiring cover and a voltage-grading ring. The zinc oxide resistor is used as the main component inside. This structure enables the arrester to respond and conduct within nanoseconds, effectively short-circuiting the overvoltage to the ground to achieve discharge.

Application and maintenance

Arrester is widely used in power systems. With the increase of power load and the complexity of the grid structure, the performance requirements of the arrester are getting higher and higher.
In order to ensure the normal operation of the arrester, regular inspection and maintenance are required to ensure that it can play its protective role at critical moments.