Mechanical Properties of Metal Shell of Gas Isolated Switch:A Simulation and Experimental Study

The stress/strain/deformation distributions, of the cylindrical metal shell of the gas (SF6) isolated switch (GIS) under pressure, were mathematically modeled, theoretically analyzed, numerically simulated in finite element method with ANSYS software and experimentally measured. The simulated results show that the internal pressure has a major impact. To be specific, at the standard internal pressure of 0. 95 MPa, in the increase (decrease) of pressure, the strain changes within the limit of elastic deformation and no plastic deformation may occur;the strongest stress localizes along the right intersecting line on the right side of the pullout. The simulated strongest stress of 117 MPa is fairly in good agreement with the measured one (~ 112. 9 MPa). The metal shell, modeled in the simulation, well satisfies the environmental safety requirements.