Products Details
Overview
Arrester is an overvoltage protector, which is mainly used to protect various electrical equipment (transformer, switch, capacitor, arrester, transformer, generator, motor, power cable, etc.) systems such as power system, railway electrification system and communication system Protection of atmospheric overvoltage, operation overvoltage and power frequency transient overvoltage is the basis of insulation coordination of power system. Its main material is zinc oxide. The lightning arrester is usually connected between the grid conductor and the ground wire, and sometimes it is also connected near the electrical winding or between the conductors. The core element (resistor) of metal oxide arrester (MOA) adopts the advanced formula based on zinc oxide, which has very excellent nonlinear (volt ampere) characteristics, that is, under normal working voltage, the current passing through is only micro ampere level. When over-voltage is received, the current passing through can reach thousands of amperes instantly, so the arrester is in the conduction state and releases over-voltage energy, thus effectively limiting the damage of over-voltage to power transmission and transformation equipment. The traditional SiC arrester has the disadvantage of high steep wave discharge voltage due to the delay of steep wave discharge, and high working wave discharge voltage due to the large dispersion of working wave discharge. Zinc oxide arrester has the advantages of good steep wave response, no delay for steep wave voltage, low residual voltage, no discharge dispersion, etc. The protection margin of steep wave and working wave is greatly improved. In terms of insulation coordination, the protection margins of steep wave, lightning wave and working wave can be almost the same, so as to provide the best protection for power equipment. The composite sheathed metal oxide arrester adopts the overall injection molding process of two end packaging, which has good sealing performance, excellent explosion-proof performance, pollution resistance, no need to clean, can reduce the occurrence of wet flashes in foggy days, and is resistant to electrical corrosion, aging, small in size, light in weight, and easy to install and maintain. It is a substitute for porcelain bushing arrester. 
Features
1. Small size, light weight, collision resistance, no damage, flexible installation, suitable for switchgear 2. Special structure, overall molding, no air gap, good sealing performance, moisture-proof and explosion-proof 3. Large creepage distance, good water repellency, strong anti pollution ability, stable performance, and reduced operation and maintenance 4. Zinc oxide resistor, unique formula, small leakage current, slow aging speed, good response characteristics, no continuous current, large current capacity, low residual voltage, strong ability to suppress overvoltage, pollution resistance, anti-aging, free from altitude constraints, simple structure, no gap, tight sealing, long life and other characteristics. 5. The actual DC reference voltage, square wave current capacity and high current tolerance are higher than international standards 6. Under normal system working voltage, this arrester presents a high resistance state, and only microamp current passes through. Under the action of over-voltage and large current, it presents low resistance, thus limiting the residual voltage at both ends of the arrester. Conditions Of Use
- Ambient temperature: -40°C~+40°C -Maximum wind speed: no more than 35m/s -Altitude: up to 2000 meters - Earthquake intensity: no more than 8 degrees - Ice thickness: not more than 10 meters. - The long-term applied voltage does not exceed the maximum continuous working voltage.
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