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What is the corona ring purpose? How does a corona ring work? What are the benefits of using corona rings? Read on to know about the corona ring purpose guide.
If you have any questions about corona ring purpose, you will find all answers right here.
So, keep reading to learn more.
Contents
1 What is the main purpose of a corona ring?
2 How does a corona ring work?
3 Where are corona rings used for?
4 What are the benefits of using corona rings?
The corona ring is an integral part of the insulator assembly, and it serves two main purposes:
The main purpose of a corona ring is to reduce the effects of corona and hence reduce the radio interference.
The purpose of the corona ring is to "bleed off" some of the voltage which would otherwise be lost in the corona effect, thus minimizing power loss, reducing radio interference and improving efficiency.
To help prevent flashover by increasing the effective creepage distance on the insulator.
Corona rings are used to increase the voltage across a component or surface. Corona rings are generally made of aluminum and used in overhead power lines to increase the surface potential and reduce corona loss. These rings are mounted on crossarms.
Corona is an ionized gas occurring naturally in the environment, which can also be produced artificially by high-voltage electrical discharges.
Corona is generally unwanted, especially in electricity transmission where it wastes energy, increases conductor corona loss and radio interference, and can cause damage to insulators. Corona discharge from conductors may also produce ozone (O3) as a pollutant and can cause noise or audible sound.
High voltage corona discharges occur around most high voltage equipment such as power lines and transformers; the electric field strength required for corona depends on air density, moisture content, presence of contaminants or dust, insulation type, shape of the conductor, etc., but is typically 30-40 kV/cm for dry air at sea level pressure (atm).
At lower voltages the air is normally an insulator; however, as voltage increases a stage is reached where small areas of ionization occur and current flows through these paths creating characteristic "streamer" discharges.
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.
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.
The corona ring has an excellent quality, can be used for a long time, and is not easy to age.
The corona ring has high temperature resistance, the surface is smooth and free of oil, no burr and pores.
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