Introduction A variety of forms of corona discharge, from various metal objects. However, controlled corona discharges are used in a variety of processes such as air filtration, photocopiers, and ozone generators. These gases are corrosive and can degrade and embrittle nearby materials, and are also toxic to humans and the environment.Ĭorona discharges can often be suppressed by improved insulation, corona rings, and making high voltage electrodes in smooth rounded shapes. In the air, coronas generate gases such as ozone (O 3) and nitric oxide (NO), and in turn, nitrogen dioxide (NO 2), and thus nitric acid (HNO 3) if water vapor is present. In high voltage equipment like cathode ray tube televisions, radio transmitters, X-ray machines, and particle accelerators, the current leakage caused by coronas can constitute an unwanted load on the circuit. Corona discharge from high voltage electric power transmission lines constitutes an economically significant waste of energy for utilities. In many high voltage applications, corona is an unwanted side effect. Corona discharges can also happen in weather, such as thunderstorms, where objects like ship masts or airplane wings have a charge significantly different from the air around them ( St. 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 mechanism as a gas discharge lamp. A corona discharge occurs at locations where the strength of the electric field ( potential gradient) around a conductor exceeds the dielectric strength of the air. 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. NIST laboratory in 1941Ī corona discharge is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor carrying a high voltage. Large corona discharges (white) around conductors energized by a 1.05 million volt transformer in a U.S. The corona discharge around a high-voltage coil Corona discharge from a spoon attached to the high voltage terminal of a Tesla coil. Corona discharges represent a significant power loss for electric utilities. Long exposure photograph of corona discharge on an insulator string of a 500 kV overhead power line. ( Learn how and when to remove this template message) ( September 2010) ( Learn how and when to remove this template message) Please help improve it to make it understandable to non-experts, without removing the technical details. This article may be too technical for most readers to understand.
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