CORONA

Corona, the partial discharge is formed due to ionization of air where electric field exceeds a critical value and it produces ozone and Nitrogen oxide which are corrosive chemicals. During high humidity this axide creates Nitric Acid which is very corrosive and works like slow poison for the system. Corona damages the area around it and also creates radio interference. It emits UV rays and makes audio noise. Insulators and conductor get damaged due to Corona

Corona on the insulator is very dangerous because the Nitric Acid which is created during high humidity starts damaging the insulator Unless the intensity of corona is very high it cannot be seen with naked eyes. Early detection of corona and the subsequent preventive action will help to maintain the required uptime.

Corona on the Insulator can be removed by cleaning the intiators thoroughly Corona detection can also be done before and after cleaning of insulator as

quality check, Ultra High sensitive Daytime Corona Camera is used to capture corona even during broad day light. Attached some PO’s from Tata Projects Itd to Sonel