UHV AC switching controllable arrester technology leader in the world

On June 25, China Society of Electrical Engineering organized and held the Technical Appraisal Meeting of UHV AC Switched Controllable Arrester. Accreditation Committee experts believe that the project has made innovative breakthroughs in the development of UHVAC switch-controlled arresters, providing a new technology for the operation of over-voltage limiting of UHV AC transmission systems. With the elimination of the circuit breaker closing resistance, the project can be significantly improved Project economy and reliability, the overall reached the international advanced level.
"UHV AC switch-type arrester controllable" project by the China Electric Power Research Institute and Pinggao Group Co., Ltd. to carry out production and research coordination research, which lasted 12 years, has received a National Natural Science Foundation of key projects, two State Grid Corporation of science and technology Project and two UHV projects funded.
The project has formed three innovations and put forward a method of controlling the arrester depth to suppress the over-voltage operation. The mechanical switch or power electronic switch is used to control the arrester protection characteristics. Under the condition of satisfying the reliability, the operation can suppress the over-voltage in depth and cancel the circuit breaker Closing resistance, significantly improve the engineering economy; Proposed controllable ratio of arrester configuration and control strategies to meet the closing and reclosing overvoltage limit requirements for the length of the line within 350 km, the use of 15% to 20% of the Control ratio, the circuit breaker closing resistance can be canceled, the line operation overvoltage can be limited to less than 1.7pu and the operating flashover rate can be limited to less than 0.01 times / year. The integrated design scheme of UHV AC switch-type controllable arrester , Optimized the control unit and mechanical switch reliability technology, solved the arrester body voltage distribution and energy absorption problem, and developed the first prototype of UHV AC switch-type controllable arrester. At present, the UHV AC switch-type controllable arrester developed by the project has been put into operation for one year at UHV AC test base with stable performance and basically has the engineering application conditions.

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