High voltage arrester technical requirements

I. Design technical requirements
1. The type and acceptance of high-voltage arrester shall comply with the requirements of DL/T804 and GB50150. The general valve arrester belongs to the phase-out product. For the 110KV~200KV general valve arrester, it should be actively replaced.
2. Other special metal oxide surge arresters used to protect dry-type transformers, generators' magnetic circuit, GIS, etc., whose characteristic parameters are determined by the user according to the characteristics of the equipment and the manufacturer.
3. The sinister link of the high-voltage arrester should not subject the terminal to more than the allowable external stress.
4. The exhaust passage of the zinc oxide arrester should be smooth. The discharged gas shall not cause flashover between phases or earth and shall not be sprayed on other electrical equipment.
5. The lightning protection of the switch station of the power plant shall meet the requirements of the regulations and meet the safe operation of the switchgear equipment.
Two. Operational technical requirements
1. The leakage current should be measured live during operation according to the regulations. When an abnormal situation is found, the cause should be promptly identified. Metal oxide surge arresters with a voltage rating of 35KV and above may be charged to replace periodical power outage tests, but 500KV metal zinc oxide surge arresters shall be subject to a power outage test for 3 to 5 years.
2. Strictly abide by the test cycle of the electric conductivity of the arrester, and measure it once before and after the thunderstorm season. 110KV and above surge arresters are easy to install. For arresters that have installed on-line inspection records, at least one inspection a day, once every half a month, and enhanced data analysis.
3. Periodically use an infrared imager to scan the arrester body and electrical connections to detect abnormal temperature rise.
As summer approaches and thunderstorms become more frequent, the detection of arresters is essential.
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