A corona ring is a precision-engineered grading device installed on high-voltage transmission line fittings and substation equipment to control electric field distribution. Typically mounted at the terminals of insulator strings, bushings, or arresters, it minimizes corona discharge, reduces radio interference (RI), and mitigates power loss under high electric stress conditions.
Manufactured from high-conductivity, corrosion-resistant materials, corona rings enhance the electrical performance and service life of insulation systems by preventing localized field intensification and surface degradation.
Key Features
- Electric Field Control: Optimizes voltage distribution, reducing peak electric stress at critical points
- Corona Discharge Suppression: Minimizes ionization, audible noise, and electromagnetic interference
- Material Integrity: Constructed from aluminum alloy or stainless steel for high conductivity and corrosion resistance
- Surface Finish: Smooth, polished surface to prevent charge accumulation and micro-discharge
- Mechanical Strength: Robust design to withstand wind load, vibration, and environmental stress
- Compatibility: Engineered for integration with insulator strings, GIS bushings, and surge arresters
- Standards Compliance: Designed to meet IEC, ANSI, and IEEE performance specifications
- Low Maintenance: Long operational lifespan with minimal inspection requirements
