Manufacturers usually recommend aluminum corona rings to be installed at the conductor end of the string insulators for lines above 230 kV and on both ends of the insulator for 500 kV.
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are toroidal shaped metallic rings which are fixed at the end of bushings and insulator strings. They are also called as. Corona rings are used to preventthat occurs in high-voltage power lines. Corona discharge or corona loss is a significant issue with very high voltage power lines which causes power loss. Oneis using corona rings.Corona discharge occurs when the electric field (potential gradient) at the surface of conductors exceed a critical value, called as. The value of critical disruptive voltage varies with atmospheric condition. Its value is roughly 30 kV/cm. The electric field greatest where the curvature is sharpest. Therefore, corona discharge occurs first at the points where the curvature is greatest - i.e. at suspension points, corners and edges. Corona rings are installed at these points to prevent corona formation.A corona ring is electrically connected to the conductor, encircling the points where corona discharge may occur. Therefore, the corona ring distributes the electric field (or charge) across a wider area, because of its smooth round shape. Hence, it reduces the potential gradient below the critical disruptive value.are very similar to corona rings. In fact, one can say, grading ring and corona ring are two different names for the same device. The difference is due to their main purpose of use and their placement. Grading rings encircle insulators rather than conductors. Their main purpose is to reduce the potential gradient along the insulator. Grading rings help in equalizing the potential distribution over a string of suspension insulator . Hence, grading rings improve the string efficiency and prevent insulation breakdown. Grading rings also serve the purpose of corona rings to some extent.
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.
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.
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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.
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.
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