Application of controlled switching device for high voltage circuit breaker in KEPCO real power system

The switching surge occurs due to the transient phenomenon in the opening and closing operation of the high voltage circuit breaker. It puts a strain on the circuit breaker components. The controlled switching device for high voltage circuit breaker reduces the contact wear and the stress applied to the component by minimizing the switching surge by controlling the contact moment during the switching operation of the circuit breaker. Overseas advanced competitors have already commercialized controlled switching device for on - site use, and in Korea, they are now entering the stage of development, testing and using devices after reviewing technology. This paper introduces the technical principle of switching control for high voltage circuit breakers and the research contents applied to the 362kV GIS in KEPCO of the developed controlled switching device.