Discharge Conditions Analysis of Lightning Current Action on Ground Wire-Suspension Clamp System

The discharge inside the suspension clamp is a significant factor for the damage of overhead ground wire. To find the reason of discharge, an electric circuit model was established to analyze the current distribution of contact points inside the Ground Wire-Suspension Clamp System (GW-SC System). Subsequently, the current waveform flowing through each contact point in different torque was obtained through finite element simulation. Based on the result, a single contact point model was created to analyze the electric field intensity distribution around the contact point with the highest current flow. The final result shows that, under the action of lightning current, the air gap near the contact point has a very high electric field intensity, which may even exceed 30kV/cm. The shape and size of contact point have a great impact on the electric field intensity and distribution.