Insulation design and analysis on high voltage vacuum interrupter

In this paper, the structure of vacuum interrupter was designed and simulated, and the factors affecting the electric field distribution inside vacuum interrupter were analyzed. After simulating the electric field distribution by using 3D finite element software Ansoft, the main shield structure and electrode contour were designed and studied. By changing electrode contour, main shield structure, the gap length between electrode and shield and adding equalized shield, the insulation structure was optimized. Based on the design and analysis in this paper, the vacuum interrupter was manufactured. When the contact gap length was 60 mm, it passed withstand voltage test including 230 kV power frequency voltage test and 550 kV impulse voltage test.