Lightning arrester service life problem

Lightning arrester is an electrical appliance used to protect electrical equipment from high transient overvoltage hazards and limit the freewheeling time and often limit freewheeling assignment. Simply put, it is a device used for lightning protection.

The service life of the arrester is related to many factors. In addition to manufacturing quality, seal failure, moisture and other external factors, the aging speed of the arrester valve is the key factor affecting the service life. Due to its heavy action and load, large freewheeling, poor operating characteristics, silicon carbide arresters may suffer from transient overvoltage hazards and other reasons, accelerate valve aging, and have a short life span, generally 7 to 10 years, or even only 3 to 3 years. 5 years. The valve of the gapless zinc oxide arrester bears the grid voltage for a long time, the working conditions are severe, the inflection point voltage is low, the action frequency is large, and it may suffer from transient overvoltage hazards, temperature and heat damage, etc., quickly accelerate the valve aging, and have a short life. Some are shorter than silicon carbide arresters. The gap of the series gap zinc oxide arrester can ensure that the valve plate can only withstand high voltage during the overvoltage protection action process, and the time is very short (within 100μs). In other cases, the valve plate is isolated from the grid voltage or in an isolated state (when pure gap). Or in a low-potential state (composite gap resistance partial pressure), which greatly improves the long-term working conditions of the valve, and can also avoid transient overvoltage hazards and temperature thermal damage, and ensure that the temperature of the valve does not exceed 55°C, thereby ensuring the life of the arrester up to 20 More than years.

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