Zinc Oxide Arrester

Zinc oxide arrester is a new type of arrester developed in the 1970s. It is mainly composed of zinc oxide varistor. Each varistor has a certain switching voltage (called varistor voltage) when it is made. Under normal working voltage (that is, less than the varistor voltage) the varistor value is very large, which is equivalent to the insulation state, but under Under the action of impulse voltage (greater than the varistor voltage), the varistor is broken down at a low value, which is equivalent to a short circuit state. However, after the varistor is struck, it can return to the insulation state; when the voltage higher than the varistor voltage is removed, it returns to the high resistance state. Therefore, if a zinc oxide arrester is installed on a power line, when a lightning strikes, the high voltage of the lightning wave causes the varistor to break down, and the lightning current flows into the earth through the varistor, which can control the voltage on the power line within a safe range. This protects the safety of electrical equipment.

Zinc oxide arresters are electrical products used to protect various electrical equipment in the power system from overvoltage damage and have good protection performance. Because the nonlinear volt-ampere characteristics of the zinc oxide valve are very good, only a few hundred microamps of current can pass through it under normal operating voltage, making it easy to design into a gapless structure, making it have good protection performance, light weight, and small size. feature. When overvoltage invades, the current flowing through the valve plate increases rapidly, which limits the amplitude of the overvoltage and releases the energy of the overvoltage. After that, the zinc oxide valve plate returns to the high resistance state, allowing the power system to operate normally.

Zinc oxide arresters can be divided into two categories according to their structure：

1. Porcelain jacket: Porcelain jacket zinc oxide arresters are divided into four levels according to their pollution resistance. Level I is for ordinary types, Level II is for use in moderately polluted areas (specific creepage distance 20mm/KV), and Level III is for heavy-duty applications. Contaminated areas (specific creepage distance 25mm/kV), Level IV is used in extremely polluted areas (specific creepage distance 31mm/kV).

2. Composite jacket: The composite jacket zinc oxide arrester is made of composite silicone rubber material as the jacket, and uses high-performance zinc oxide resistor sheets. The interior adopts a special structure and is assembled using advanced technology. It has silicone rubber materials and zinc oxide resistors. The dual advantages of the film. In addition to all the advantages of porcelain-coated zinc oxide arresters, this series of products also has good insulation performance, high pollution resistance, good explosion-proof performance, small size, light weight, no need for maintenance, not easy to be damaged, reliable sealing, and durability. Excellent aging performance and other advantages.

Zinc oxide arresters can be divided into three categories according to structural performance: no gap (W), with series gap (C), and with parallel gap (B).

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