Investigation of two types of interrupting chamber with low drive energy and development of 245-kV GCB

In an attempt to generate high pressure with small driving energy, two types of interrupting chamber, two volumes-two pistons-type, and one volume-one piston-type are compared by simulating opening operating characteristics. As the result of the simulations, we concluded that one volume-one piston-type chamber could generate sufficient high pressure and ability to interrupt high current with a simpler structure and limited operating energy. A new GCB for 245-kV GIS adopting the new chamber has been developed.