The arrester is used to limit the overvoltage on the electrical equipment and protect the normal and reliable operation of the electrical equipment. It is usually connected in parallel with the protected equipment. The arrester can effectively protect the electrical equipment. Once the overvoltage occurs, the arrester will act and play a protective role. When the equipment is running under normal working voltage, the arrester will not work, and it will be regarded as an open circuit to the ground. Once a high voltage occurs and the insulation of the protected equipment is endangered, the arrester will act immediately to guide the high-voltage surge current to the ground, thereby limiting the voltage amplitude and protecting the insulation of the equipment. When the overvoltage disappears, the arrester quickly returns to its original state, and the electrical equipment works normally.
Therefore, the main function of the arrester is to cut the invading flow wave and reduce the overvoltage value of the protected equipment through the function of the discharge gap or the nonlinear resistance, thereby protecting the electrical equipment.
Lightning arresters can be used not only to protect against high voltages generated by lightning, but also to protect against operating high voltages.

Arrester types
Types of arresters (12 photos)
The role of the arrester is to protect various electrical equipment in the power system from being damaged by lightning overvoltage, operating overvoltage, and power frequency transient overvoltage. The main types of arresters are non-gap metal oxide arresters and series gap metal oxide arresters. Series-gap metal oxide arresters are mainly used to limit atmospheric overvoltage, and are generally used for line and substation incoming line protection. Gapless metal oxide arresters are used for the protection of substations and power plants. In systems of 500KV and below, they are mainly used to limit atmospheric overvoltage. In ultra-high voltage systems, they will also be used to limit internal overvoltage or backup protection for internal overvoltage. .

The role of arresters
It protects important power equipment from overvoltage. Its performance directly determines the insulation design level of important power equipment and affects the investment cost of the entire project. It is a key equipment related to the safe and reliable operation of power systems. It is widely used in Transmission lines, substation (converter) stations, power plants, rail transit and other scenarios. An electrical appliance that limits the freewheeling time and often limits the freewheeling amplitude.
AC gapless metal oxide arrester has excellent nonlinear volt-ampere characteristics, good response characteristics, no freewheeling, large current capacity, low residual voltage, strong ability to suppress overvoltage, anti-pollution, anti-aging, not subject to altitude constraints, Simple structure, no gap, tight seal, long life and so on.
The arrester is in a high resistance state under normal system operating voltage, and only microampere current flows. It exhibits low resistance under the action of overvoltage and high current, thus limiting the residual voltage across the arrester

Xi'an Yudian Electrical Equipment Co., Ltd. is located in the second phase of the Science and Technology Enterprise Accelerator, Caotang Industrial Park, High-tech Zone, Xi'an City, Shaanxi Province. It is a high-tech enterprise integrating research and development, manufacturing, technical services and marketing of high and low voltage electrical products. Relying on the advantages of technology and talents in Xi'an, the company cooperates closely with well-known scientific research institutions and colleges such as Xi'an High Voltage Electric Apparatus Research Institute Co., Ltd., National Insulator Arrester Quality Supervision and Inspection Center, Xi'an Jiaotong University, etc. Advanced technology and complete testing equipment.
The company currently mainly produces 0.22~220kV voltage grade metal oxide arresters, overvoltage protectors, cable sheath protectors, pillar insulator arresters, counters, monitors, harmonic suppressors; surge protectors; transformer neutral point grounding protection devices , Transformer air-cooled control cabinet, terminal box, etc. The product has advanced design, sophisticated manufacturing, beautiful appearance, excellent performance and stable operation. The main products have passed the type test of the National Insulator Arrester Quality Supervision and Inspection Center.
The company always adheres to the business philosophy of ""creating high-quality products with ingenuity and winning the trust of users with conscience"", with the quality policy of ""pragmatism, cooperation, innovation, refinement, quality in hand, and users in heart"", ""customer first, quality first"". First, the development tenet of ""Credit First"", the unremitting pursuit of ""continuously creating value for customers"", and work together with new and old customers to create brilliance.

Li Kanghu

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