Development of a new standard model of GIB using electromagnetic-structural coupled analysis

To develop a new standard design of gas-insulated bus(GIB), an electromagnetic-structural finite element analysis has been conducted considering the electromagnetic force generated in GIB with a large current. The GIB are electrical bus-bar parts of a gas-insulated switchgear(GIS) installed as a protective device in power plants and substations. Since the electromagnetic forces generated by a large current flowing through inner conductors of GIB tend to be very large, the structural integrity of the GIB should be evaluated. The magnetic force was calculated by the virtual work method and structural analysis was performed by utilizing the calculated force as a load condition. By modifying the designs based on the structural safety evaluation results, the maximum lengths of conductors could be increased by about 40∼50%.