corona ring

Key Functions:

1. Electric Field Grading –

   • Smooths the electric field gradient around high-voltage terminals, preventing localized high field intensity that could lead to corona discharge.

   • Reduces surface stress on insulators, bushings, and other insulating components.

2. Corona Suppression –

   • Minimizes corona discharge, which can cause power loss, audible noise, radio frequency interference (RFI), and ozone generation.

   • Extends the lifespan of insulation materials by preventing erosion from ion bombardment.

3. Voltage Equalization –

   • In multi-unit apparatus (e.g., insulator strings), it ensures uniform voltage distribution across individual units.

Design & Construction:

• Material: Typically made of aluminum alloy (lightweight, corrosion-resistant) or stainless steel (for harsh environments).

• Shape: Smooth, rounded edges (toroidal or torus-shaped) to avoid sharp points that could intensify electric fields.

• Mounting: Installed at high-voltage terminals of transformers, bushings, surge arresters, and transmission line insulators.

Applications:

• High-Voltage Transmission Lines (e.g., 500kV+ AC or HVDC systems).

• Substation Equipment (e.g., circuit breakers, instrument transformers).

• Laboratory High-Voltage Testing Setups.