Lightning arrester working principle


Lightning arresters are equipment for protection of sub […]

Lightning arresters are equipment for protection of substation protection equipment from lightning shock waves. When the lightning shock wave transmitted to the substation along the line exceeds the protection level of the arrester, the arrester first discharges, and the lightning current is safely introduced into the earth through the good conductor, and the grounding device is used to limit the lightning voltage amplitude below the lightning strike level of the protected equipment, so that Electrical equipment is protected.

According to the development of the arrester, it can be divided into: protection gap - a simpler type of arrester; tube type arrester - is also a protection gap, but it can extinguish the arc after discharge; valve type arrester - is a single discharge The gap is divided into many short series gaps, and the nonlinear resistance is added to improve the protection performance; the magnetic blow arrester uses the magnetic blow spark gap to improve the arc extinguishing capability, and also has the ability to limit the internal overvoltage; zinc oxide Arrester - the ideal volt-ampere characteristics of the zinc oxide valve plate (non-linearity is high, that is, low resistance at high current, limiting the voltage on the arrester, high resistance at normal power frequency), No gaps, no freewheeling residual voltage, etc., can also limit internal overvoltage, is widely used