Dynamic Characteristics of Electric Field and Mechanical Stress Distribution of GIS Insulation Rod During Operation

In this paper, a gas insulated switchgear (GIS) insulation rod model is built by the finite element software, to research the electric field and mechanical stress distribution of the rod during the closing process. The electric field strength near the contact end (high voltage part) gradually decreases to 0, while simultaneously, the field strength at the operating end (grounding part) sees a corresponding increase. The maximum field strength along the surface remains relatively stable. The distribution of mechanical stress across the rod's surface is not uniform before the impact, and at the moment of the impact, the rod experiences large alternating tensile and compressive stresses. Significantly, the surface electric field and mechanical stress distribution of the insulation rod do not maintain the same distribution characteristics at different displacements during operation. Dynamic characteristics of the insulation rod is vital for optimizing the circuit breaker design and improving its operational performance and safety.