Corona Discharge is generated by the ionization of air and is a weak pulse, so there is no abnormality in the operation of the product and it is not easy to detect.
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A corona discharge is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor carrying a high voltage. It represents a local region where the air (or other fluid) has undergone electrical breakdown and become conductive, allowing charge to continuously leak off the conductor into the air. A corona occurs at locations where the strength of the electric field (potential gradient) around a conductor exceeds the dielectric strength of the air. It is often seen as a bluish glow in the air adjacent to pointed metal conductors carrying high voltages, and emits light by the same property as a gas discharge lamp.
The XT-350 PB39b checks for the presence or absence of corona discharge and spark discharge generated by high voltage application, and when corona discharge and spark discharge are detected, it is displayed as the discharge rate.
Corona discharge Video: