A corona ring works on the principle of electric field distribution. The electric field is most intense at points of high curvature, such as sharp edges or corners on hardware and conductors. By installing a smooth, rounded, conductive ring around these points, the ring effectively increases the curvature and spreads the electric charge over a larger area. This significantly reduces the localized electric field intensity to a level below the point at which air begins to ionize.

The benefits of using corona rings are substantial:

• Minimizes Power Loss: Corona discharge is a form of energy dissipation. By preventing it, the system's efficiency is improved, especially on long-distance transmission lines.

• Reduces Equipment Damage: The ozone and nitric acid produced by corona discharge are corrosive and can cause materials like insulators to age and fail prematurely. The rings protect these components, extending their service life.

• Mitigates Radio and Audible Noise: The electrical disturbances from corona discharge can cause interference with radio communications and produce audible hissing or cracking sounds. Corona rings eliminate this unwanted noise.

• Enhances System Reliability: By preventing flashovers and equipment failure due to corona, the rings contribute to the overall stability and reliability of the power grid.