Corona Ring for Transmission Line

Corona rings are conductive metal fittings used to control electric field intensity and prevent corona discharge in high-voltage systems. High-quality corona rings from Nooa Electric  are designed to reduce corona discharge, protect insulators, and improve grid reliability. Ideal for EHV, UHV, and HVDC applications.

1. Superior Electric Field Control

• Optimizes voltage distribution across insulators
• Reduces peak electric stress at hardware points

2. Effective Corona Suppression

• Minimizes corona discharge and ionization
• Reduces power loss and improves transmission efficiency

3. Extended Insulator Lifespan

• Protects glass, porcelain, and composite insulators
• Prevents premature aging and surface degradation

4. Noise & Interference Reduction

• Decreases audible corona noise
• Limits radio and electromagnetic interference (RI/EMI)

5. Corrosion Resistance & Durability

• Manufactured with high-grade aluminum alloy or galvanized steel
• Suitable for harsh outdoor environments (coastal, desert, industrial zones)

Customizable dimensions and materials to meet voltage and project requirements.

Proper design ensures optimal corona performance and system safety.

1. Voltage Level Matching

Higher voltage systems require larger ring diameters and optimized geometry.

2. Electric Field Simulation

Advanced simulation tools (e.g., FEM analysis) are used to determine optimal ring configuration.

3. Mechanical Strength

Designed to withstand:

• Wind load
• Ice load
• Mechanical vibration

4. Surface Smoothness

Polished surfaces reduce micro-discharge points and enhance corona extinction performance.

Essential for transmission lines, substations, and HV equipment.

1. Overhead Transmission Lines

• Suspension insulator strings
• Tension strings in EHV/UHV lines

2. Substation Equipment

• Bushings
• Circuit breakers
• Surge arresters
• Disconnectors

3. HVDC Transmission Systems

• Critical for continuous DC electric field control
• Reduces corona-induced losses and interference

Compliance ensures reliability and global project acceptance. Our Nooa Electric corona rings are manufactured and tested according to lEC standards:

• IEC 60383 / IEC 61109
• ANSI standards
• Corona extinction voltage (CEV) testing
• Visual and dimensional inspection
• Mechanical load testing

1. What is the main function of a corona ring?

It redistributes the electric field around high-voltage, preventing corona discharge and protecting insulation components.

2. When should corona rings be used?

They are typically required for systems above 110 kV and are essential for 220 kV, 400 kV, and higher voltage levels.

3. Can corona rings be customized?

Yes, dimensions, materials, and configurations can be tailored to match specific project and voltage requirements.

4. What materials are commonly used?

Aluminum alloy is preferred for its lightweight and corrosion resistance, while galvanized steel offers higher mechanical strength.

5. Are corona rings necessary for HVDC systems?

Yes, they are even more critical in HVDC systems due to constant electric stress and higher corona risks.