Transient Simulation Model for Electric Field Distribution in Cable Joint

Abstract The analysis of the impact of the switching impulse voltage on the internal electric field of the cable joint plays a key role in studying the breakdown of the joint. In this paper, the finite element method is used to simulate the transient electric field of the axisymmetric model of the cable joint. By changing the closing moment, the influence of different closing moments on the electric field intensity distribution is studied and analyzed. The results show that under the switching voltage excitation, when the closing moment at t 0=nT, the electric field distribution in the cable joint is consistent with the steady state without distortion. Others, the point near the root of the stress cone will distort when the switch is closed, the closing moment is at 7.5ms, which is the most serious. The closing time is at 10ms, has the greatest influence on the electric field intensity distribution in the cable joint, especially the stress cone end, the bottom of the high voltage shield and the position near the high voltage conductor in the air domain.