What is Corona?

• Corona discharge is the ionization of air surrounding the electrical field
• Corona creates ozone & nitrogen
• When combined with water, corona creates nitric acid

Corona Technology

Corona Scans provide:

• Early warning of potential failures
• Visualization of corona corrosion and electrical leakage
• Ability to determine the health of critical system components
• Prioritization of maintenance schedules

Corona Caused Issues

• Insulator Corrosion
  • Reduces transmission throughput
  • Increases cost of transmission
  • Requires more generating capacity
• Wood Pole Fires
  • Insulators near end of service life leak electrical energy
  • Leaks generate fires between wood and metal surfaces
  • Fires result in outages and create public safety hazards

Corona Patrols

Identify Problems and Prioritize Maintenance

• Broken insulators
• Arcing and corrosion
• Support structure grounding
• Transformer degradation
• Broken conductor strands

Corona vs. Infared

Corona Scans Help

• Improve transmission efficiency
• Reduce greenhouse emissions
• Improve electric grid reliability
• Identify problems before failure
• Reduce outages
• Lower consumer costs