What Are High Voltage Corona Rings?

The high voltage corona rings, also called anti corona rings, they can be used in high voltage test equipment and power systems (substations, high voltage transmission line, AC voltage system, etc.) and are mainly made of aluminum alloy.

Generally the high voltage corona ring needs to be polished bright to achieve more smooth and no burr surface finish to ensure better corona control effect.

Corona ring is widely used on the end fittings of high voltage bushings and other high voltage testing equipment. High voltage can result in unwanted noise and corona, so corona rings are needed.

The high voltage corona ring is suitable for the voltage form of alternating current (AC), which can distribute the high voltage evenly around the object to ensure that there is no potential difference (PD) between the various parts of the ring.

What Are High Voltage Corona Rings Used For?

High voltage corona rings are used in a variety of applications and industries. They can be found in power supplies, high voltage generators, and HV test systems.

High voltage corona rings are used for AC high voltage transmission lines and DC high voltage transmission lines to reduce the effect of corona discharge and improve power energy transmission efficiency.

Corona rings can work in harsh environment with wide temperature range, they have good anti-corrosion performance and long life time.

The main materials used in high voltage corona rings are aluminum alloy.

The aluminum corona ring is mainly used in low-voltage power distribution network and can be used for -55~+180℃.

Aluminum high voltage corona ring has a good insulation performance and can be used for -40~+100℃.

Aluminum corona ring has good dielectric properties and corrosion resistance, it is mainly applied to high voltage power transmission lines and DC power transmission lines. It has excellent mechanical strength, so it is widely used in various types of silicon steel sheet, cable or composite insulator.

How Do High Voltage Corona Rings Work?

Coronas are produced when the electric field strength near a conductor (usually a point or sharp edge) exceeds the strength required to ionize the air around the conductor.

The field then becomes strong enough to cause electrons to be stripped from nearby air molecules, which themselves become charged, and are attracted towards the conductor with an opposite charge.

This process is then repeated over and over again, until there are so many electrons and charged ions in the vicinity of the conductor that all potential for further ionization is neutralized, and no more corona forms.

Corona Discharge is formed by high voltage DC power supply and can be applied for ozone generation (ozonizer).

The high voltage corona rings on power transformers are there to protect the equipment.

High voltage travels along the surface of a conductor. The rings that you see increase the surface area of the conductor and therefore, reduce the voltage gradient needed for corona discharge to occur.

Without them, corona discharge could occur, which would cause losses in the power transformer.

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