Effects of corona ring dimensions on the electric field distribution on 132 kV glass insulator

Insulator strings are extensively used in high voltage transmission lines in order to mechanically support the line and as the electrical insulator between line and the tower. Due to the high intensity electric field, corona phenomenon may cause a complete failure of the insulator. Therefore, applying corona rings on insulator string is one of the most effective approaches to decrease the effect of corona phenomenon, by reducing the electric field on the insulator string. This work studied the effect of the dimensions of the corona ring on the intensity of the electric field distribution on 132 kV glass insulator string type. From the results obtained, parameters of the corona ring that can affect the electric field can be identified. The results may help in designing better corona ring that can reduce the electric field.