Advantages and characteristics of the metal oxide surge arresters

MOVMetal oxide arrester is used to protect the transmission and distribution equipment, insulation against over-voltage protection of electrical hazards is important, it has a fast response, voltage characteristic flat, stable performance,Flow capacity, residual voltage, long life, simple structure, it is widely used in power generation,Transmission, substation, distribution and other systems. Composite coat metal oxide surge arresters is silicone rubber
Composite materials make coats, and traditional porcelain jacket Surge arrester , compared with a small size, light weight, rugged, stain resistance, proof performance and so on.

MOA varistor valve main ingredient is zinc oxide, Metal Oxide Varistors (MOV) has extremely excellent non-linear characteristics. Under normal operating voltage of the resistance value is high, in fact, equivalent to an insulator, and over-voltage action, the resistance of the resistor is very small, residual pressure is very low. But under normal operating voltage, since the valve frequency voltage is applied to long-term exposure arising from deterioration caused by changes in resistance characteristics, resulting in increased flow through the valve leakage current. The resistive component of the current sharp increase in temperature will rise valves on thermal collapse, severe, or even cause explosion arrester. In accordance with the provisions of rules 1, MOA total of six test items, namely (1) Insulation resistance (2) leakage current DC U1mA and 0.75U1mA under (3) AC operation voltage leakage current (4) Power frequency frequency reference voltage (5) Base insulation resistance (6) Check discharge counter action case reference current.