Influence of cable terminal stress cone install incorrectly

The electric field intensity around the power cable terminal is computed based on the finite element method when the power cable is loaded on the 110 kV constant voltage source. If the power cable terminal is installed correctly, the stress cone covers the outer semi-conducting layers 60 mm. 3 models of the power cable terminal installed incorrectly are computed, such as the stress cone covers the outer semi-conducting layers 50 mm, 46 mm, 73 mm, based on the finite element method to analyze the electric field distorted. The models were computed when loaded on the 110 kV constant voltage source. The results shown that, when stress cone covered the outer semiconducting more than 60 mm, the local electrical field distorted and the electric-field intensity increasing sharp. It is ruinous for the insulation materials when the local electrical field is distorted for the intensity exceeding the dielectric strength possibly. In the test, 3 models such as the stress cone covers the outer semi-conducting layers 50 mm, 46 mm, 73 mm run with U₀ constant voltage source or more than U₀. There were high partial discharge in the model which the stress cone covers the outer semi-conducting layers 73 mm. Tests proved the analysis were right. Stress cone which covers semi-conducting too more are harmful to the safe operation of electrical equipment.