203 / 2018-09-13 21:04:04

Analysis on Current Density of Suspension Clamp of the Ground Wire under Power Frequency Short-circuit Current

contact point；,current density,finite element analysis,overhead ground wire,suspension clamp

The ground wire breakage accident seriously affects the stable operation of the power grid. It is of great significance to analyze the current density distribution within the suspension clamp of the ground wire to investigate the mechanism of the ground wire breakage within the clamp. Firstly, combined with the distribution characteristics of contact points on the contact surface between the clamp and conductor, a Finite Element Analysis (FEA) model based on multiple contact points of suspension clamp with the same actual contact points distribution was set up. According to the FEA model, the current density distribution within the clamp was obtained. Subsequently, the effect of relative permeability of steel on current density distribution within the clamp was studied. The results show that the hotspot is located at the outer edge of contact surface between the clamp body and conductor. The current density and temperature rise are the largest in the hotspot. Moreover, as the relative permeability of steel increases, the current density for the outer edge of contact surface between the clamp body and conductor also increases, which results in higher temperature rise.