Corona Ring
The Corona ring is designed to minimize the noise that is produced due to corona voltage. It comprises a combination of rings that are attached to the end of the insulators and bushings which are also attached to other transmission line fittings. These points of installation also prevent corona discharge from taking place.
In most transmission line installations, corona discharge occurs at the curvatures. This is exactly where the corona rings are installed. They encircle such points and are also connected to the transmission line conductors. Also, the process of encircling the insulators helps to reduce the potential gradient within the specific points of the insulators.
The ring-like structure of the corona rings distributes the electrical discharge from a localized area to a large area. This means that the charges won’t accumulate beyond the dangerous levels where they will cause discharge.
Corona rings are made of aluminum metal rings that can withstand voltages of up to 230V. They also come in different diameters and your choice will depend on the voltage passing through the transmission line. They are efficient enough to prevent the breakdown of the insulators.
Features
- Unidirectional- can be installed from any direction
- Ideal for voltages above 230V
- Different ring diameter
Frequently asked questions (FAQ)
What are the applications of corona rings?
Corona rings are mainly used in high-voltage transmission lines. Such installations are prone to corona voltage and this makes it necessary to install the rings which provide ultimate solutions. They are ideal for transmission lines carrying 230kV up to 500kV.
How do corona rings work?
Corona discharge is a phenomenon that occurs when the potential gradient of an electric field goes above its critical value. This yields to disruptive voltage. This voltage is highest at the sharpest points of the conductor and this leads to corona discharge. Corona rings are installed at these points of high critical voltage to prevent corona voltage.
How to install corona rings?
The rings that exist as a single unit hence are easy to install. You won't have to juggle with different parts. They also come with a clamping mechanism that secures the rings to the insulator. The installation is unidirectional so you don’t have to be strict on the direction of installation.
What are the technical specs for corona rings?
One of the key specifications is the diameter of the corona ring. Choose the diameter that will be suitable for your power line. You should also consider the thickness of the ring and this will depend on the carrying voltage of the conductor.