Corona Ring
A corona ring also called an anti-corona ring, it is a toroid-shaped metal ring that is attached to a terminal of high voltage equipment. For system voltages 230kV and above, a corona ring is necessary. The primary role of the corona ring is to reduce corona discharge using corona rings which occur in high-voltage power lines.
Made from copper, steel, and aluminum the corona ring is packed in wooden case and cartons, Corona discharge occurs when there is an excessive localized electric field gradient as the diameter of the ring is inversely proportional to the voltage percentage of the lowermost insulators.
Corona discharge occurs in high power discharge lines using corona rings which can help reduce the corona discharge because they can damage the insulators and may produce breakdown products. To suppress the corona discharge, the wire-to-ring current flow is being formed up instead of wire-to-air.
The hot end of the stack will have a far more voltage drop across the insulators because of the stack of insulators used for EHV insulation.
Accessories used with corona rings are:
- 400kv transmission line
- Bushing
- Corona discharge
- Surge arrester
- Composite insulators
- Grading rings
Features:
- Can be used on extremely high voltage apparatus
- Prolong the lifetime of insulator surfaces
- Can easily be installed on the insulators of antennas of high-power radio transmitters
- Increase the capacitance of the insulators
| Configuration-1 | Configuration-2 | Configuration-3 | |
| Shed diameter D1/D2/D3 (mm) | 171/85 | 190/131/100 | 145/110 |
| Shed spacing B (mm) | 79 | 79 | 60 |
| Leakage path distance L (mm) | 13270 | 16300 | 13370 |
| Width of end fittings W (mm) | 72.4 | 72.4 | 86.6 |
Corona ring diameter D (mm) | 370 | ||
| Corona tube diameter d (mm) | 50 | ||
| Corona ring position H (mm) | 110 | ||
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FREQUENTLY ASKED QUESTIONS (FAQ)
The basic purpose of the corona ring is to distribute an electric field gradient by lowering the corona threshold. Corona rings produce high voltages because of high voltage power transmission insulators and switchgear. Corona ring and combination of corona rings are necessary above 230kv while high altitude, high contamination, and tight phase spacing may require rings at lower system voltages. The smooth, large diameter of spherical corona toroids controls the electric field by suppressing the generation of the corona. The diameter of corona balls must increase to obtain corona suppression. There is a certain type of product used with corona rings i.e.There is a certain type of product used with corona rings i.e.What is Corona Ring?
How is the Corona Ring used?
What is the function of the Corona Ring?
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