Resistance Grade Zinc Oxide

Resistance grade zinc oxide

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Resistance grade zinc oxide is widely used in lightning arresters, and is the main raw material for making zinc oxide arresters; the made zinc oxide arresters have good characteristics and are a new type of arresters.

The working principle of the zinc oxide arrester made ofresistance grade zinc oxide:

The current passing through the zinc oxide arrester valve plate at rated voltage is very small, which is equivalent to an insulator. When the voltage on the metal zinc oxide arrester exceeds a fixed value, the valve plate "turns on" to discharge a large current through the valve plate into the ground, and its residual pressure will not exceed the withstand voltage of the protected equipment. When the applied voltage drops below the operating voltage, the valve automatically terminates the "on" state and restores the insulation state.

The zinc oxide arrester made of resistance grade zinc oxide is different from the traditional arrester:

1) Zinc oxide arrester made of resistance grade zinc oxide is a new type of arrester with a completely different concept from traditional arresters. Traditional lightning arresters all use silicon carbide valve plates, which are separated from the power supply by a gap during normal operation. When an overvoltage occurs, the gap is broken down and the valve plate discharges. The zinc oxide arrester made of resistance grade zinc oxide has no gap, which solves various problems caused by the gap discharge time and discharge stability, and brings about major changes in the characteristics and structure of the arrester.

2) The main component of the resistance chip made of metal zinc oxide is resistance grade zinc oxide, which exhibits high resistance under normal power frequency voltage, thus limiting the leakage current of normal operating conditions, and when the voltage exceeds the starting value (lightning voltage or internal overvoltage) At this time, the valve is “on” into a low-rent state to discharge the current, thereby limiting the voltage applied to the arrester. Because this kind of resistor has very good nonlinear volt-ampere

characteristics, it has better protection performance than traditional lightning arresters.

Classification of zinc oxide arresters made of resistance grade zinc oxide:

1) Electric porcelain type zinc oxide arrester: Electric porcelain type zinc oxide arrester is used in conventional substations to replace the old general valve type and magnetic blow type arresters

2) Metal-enclosed zinc oxide arrester: It is one of the components of a fully enclosed combined electrical appliance. The zinc oxide resistor is assembled in a metal tank, filled with SF6 gas, and the metal shell is grounded.

The resistance grade zinc oxide produced by MST has stable performance and is an excellent raw material for zinc oxide arresters;