The role and principle of zinc oxide arrester
The arrester has a tube type arrester, a valve type arrester and a zinc oxide arrester. The tube type arrester is a protection gap type, and is mostly used for lightning protection on the power supply line. The role of the zinc oxide arrester and the lightning arrester include a tube type arrester, a valve type arrester and a zinc oxide arrester. The tube type arrester is a protection gap type, and is mostly used for lightning protection on the power supply line. The valve type arrester is composed of spark gap and valve resistance. The material of the valve resistor is special silicon carbide. When there is lightning overvoltage, the spark gap is broken, the resistance of the valve plate is lowered, and the lightning current is attracted to the earth. This protects the electrical equipment from lightning currents. Under normal conditions, the spark gap will not break down, and the valve resistance will rise, preventing normal AC current from passing.
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What kind of lightning protection device is zinc oxide arrester? It is a lightning protection device with superior protection performance, pollution resistance, light weight and stable valve performance. The zinc oxide arrester can be used not only for lightning overvoltage protection but also for internal operation overvoltage protection. The valve arrester can be used as lightning overvoltage protection for low voltage AC motors and low voltage power distribution equipment. Zinc oxide varistor can be used for overvoltage protection of low voltage distribution equipment, and can also be used for internal operation overvoltage protection.
The principle of zinc oxide arrester: At the rated voltage, the current flowing through the valve of the zinc oxide arrester is only 10-5A, which is equivalent to the insulator. Therefore, it can isolate the operating voltage from the valve plate without using a spark gap. When the voltage acting on the metal zinc oxide surge arrester exceeds a fixed value (starting voltage), the valve plate "conducts" to discharge a large current through the valve plate into the ground, at which time the residual pressure does not exceed the withstand voltage of the protected device. , to achieve the purpose of protection. Thereafter, when the applied voltage drops below the operating voltage, the valve plate automatically terminates the "on" state and restores the insulated state. Therefore, there is no problem of arc burning and extinction in the entire process. The arrester can release lightning or can release the power system to operate the over-voltage energy, protect the electrical equipment from transient over-voltage hazards, and can cut off the free-flowing, electrical equipment that will not cause the system to be short-circuited to the ground. Zinc oxide arresters are usually connected between the live conductor and the ground in parallel with the protected equipment. When the overvoltage value reaches the specified operating voltage, the zinc oxide arrester acts immediately, flows the electric charge, limits the overvoltage amplitude, and protects the equipment insulation; after the voltage value is normal, the high voltage arrester quickly returns to the original state to ensure the normal power supply of the system. The spark gap of the arrester is formed by connecting a plurality of non-linear resistor gaps in series. The function of the nonlinear resistor and the spark gap is similar to the function of a valve. For the lightning current, the valve is opened to make it leak into the ground; for the continuous flow of the power frequency, the valve is closed and quickly cut off.
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