Corona Ring Purpose: The Ultimate FAQ Guide

There are many applications for corona rings, so we can’t say exactly how it works in every case. But in the most basic sense, a corona ring is an insulating device that applies an electric field to high-tension wires. It’s been used for years in transformers and other electrical equipment.

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The first corona ring was developed by Nikola Tesla, who needed to find a way to distribute electricity through long power lines without losing power. He discovered that wrapping a wire in an insulating material and applying a high voltage field to it could induce current along the entire length of the wire.

Today, corona rings have many uses. One of the most common is in overhead power transmission lines, where they’re used to prevent electrical arcing and reduce power loss during transmission.

Corona rings are usually made up of aluminum material. Corona rings are used in power transmission and distribution lines to protect insulators from the damaging effect of corona discharge. Corona is an electrical discharge brought about by ionization of air surrounding a conductor that is electrically energized.

Corona discharge can cause severe problems for high voltage transmission and distribution systems. It results in dielectric breakdown of insulating materials, loss of power and in some cases fire due to insulation failure.

These are designed in such a way that they create a strong electric field at their tips, thus causing complete ionization of air. This leads to uniform erosion of corona ring material due to corona discharges instead of concentrated erosion at specific points as on un-ringed insulators.

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The corona rings are used to reduce the leakage of current and voltage in transformers. Corona rings are used in both step up and step down transformers.

In case of step up transformer, the secondary winding will be placed at the top of primary winding. So, if we don’t use a corona ring, the secondary winding at high potential will create corona around it due to high voltage stress. This corona discharge will lead to heating of insulation and eventually damage it.

In case of step down transformer, the primary winding is placed at the top so that it can be connected directly with HV supply. If we don’t use a corona ring, then the primary winding at high potential creates corona around it due to high voltage stress. This leads to heating of insulation and eventually damage it.

High voltages can result in unwanted noise (RIV) and corona. To minimize the effects of corona, corona rings are applied to one or both ends of the insulator (attached onto the end fittings). Typically, for system voltages 230kV and above a corona ring or combination of rings is necessary. However, some applications may require rings at lower system voltages when addition corona protection is required; high contamination, high altitude, or applications with tight phase spacing. For these special cases or any corona ring application assistance, contact MPS.

The MPS Smart Fit corona rings are designed around the needs of the end user. It is easy to install, unidirectional (not able to install in the wrong direction), and can be installed or removed with hot stick tools. By making the ring a one-piece design, we have eliminated the problem of missing or lost parts. This was made possible by designing a unique clamping mechanism that uses two bolted keepers to secure the ring to the insulator. Additionally, the clamping section was designed such that the ring can only be installed in one direction, which eliminates the problem of misapplied rings. As a final step, the ring was designed with a split (opening) to allow installation with hot stick tools.

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