Calculation of the opening characteristics on 3 phase current interruption for 3 phase common operating mechanism type GCB

Simulation program is developed to calculate the opening characteristics on 3 phase fault current interruption for 3 phase common operating mechanism type puffer GCB. This program allows to calculate the 3 phase opening characteristics on no load, and on 3 phase current. interruption and on 1 phase current interruption in that. common mechanism type GCB driven by hydraulic, spring or other force source. It is confirmed that the calculated results well agree with the measured results. Some fundamental interruption performances such as for small capacitive current switching, for 3 phase 100% terminal fault current interruption and for short line fault current interruption are understood from the calculation results, then the dimension of interruption chamber and the driving energy can be suitably determined at the time when a GCB is designed. Using this simulation program, new 72/84kV and 145kV 3 phase GCB driven by 1 mechanism could be reasonably and rapidly developed.