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Difference Between Arcing Horn And Corona Ring: The FAQ Guide

If you want to know what are the difference between arcing horn and corona ring, then you at right place.

We will discuss all the difference between them, like how they worked and how to differentiate them.

Arcing horn is a device in power transmission systems to help prevent short circuits. It is designed to arc over if it senses current levels that are greater than the amount of current that should be normally flowing through the circuit. This can indicate that a short circuit has occurred and arcing horn can provide protection for the circuit by interrupting the flow of electricity.

This interruption of electricity flow is designed to help protect equipment from damage. The arcing horn can also help protect people from being electrocuted if they come into contact with the circuit. The device may have a variety of features, such as automatic resetting, which allows it to function again after it has been tripped. However, some types of arcing horns will require manual resetting, which can be done by a qualified electrician or someone who is authorized to work on electrical systems.

What is A Corona Ring?

The corona rings, also called aluminum 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 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 equipments. High voltage can result in unwanted noise and corona, so corona rings are needed.

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.

Similarities Between Arcing Horn And Corona Ring

Arcing horn and corona ring are two components of a high voltage electric power transmission system.

Arcing horns are used to protect the insulators from being damaged by lightning strikes and other overvoltage phenomena.

Corona rings are used to reduce noise and corona from the system.


  • Both arcing horns and corona rings are usually made of aluminum alloy.
  • Both arcing horns and corona rings serve to protect the insulators from damage due to over voltage phenomena.
  • Both arcing horns and corona rings are mounted on the end of insulators.

Difference Between Arcing Horn And Corona Ring

Arcing Horn:

In this method, the tip of a high voltage pin-type insulator is tapered to a point and sharpened to form a horn.

This horn is placed in air at a distance of about 1 cm from the surface of the conductor. The air between the conductor and horn behaves as a dielectric and withstands the applied voltage. Hence, no corona occurs.

Corona Ring:

The corona ring is designed to produce equal electric field intensity all over its surface. The insulator must be designed in such a way that it will not allow any ionization at or near its surface, but will allow ionization at its outer edge.

To prevent corona occurring around the edges of the ring, it is provided with an outer covering made up of porcelain (or similar material) which has good mechanical strength and high electrical resistance.


It is important to know what are the difference between arcing horn and corona ring in order to determine which is best for your specific needs.

Despite some similarities, arcing horn and corona ring are different devices and each have their own particular characteristics.

While both of them are great for high voltage industries, each has specific applications.

If you want to learn more about them, please contact us for more information.