Corona and arcing detection in high voltage transmission lines

The use of DayCor^® systems to inspect high voltage transmission lines and grid componenets has proven to be reliable, accurate and very effective. Worldwide electric utilities are using Ofil's DayCor^® corona and arcing inspection equipment for cases such as:

• Degradation of Polymer insulators
• Contamination - coastal salt; industrial vapors and dusts; cement dust; highway road-salt; tire dust and car emissions; agricultural dusts and fertilizers
• Cracked porcelain insulators
• Rusted cement and metal caps & pins on porcelain insulators.
• RFI, TVI and audio noise sources lead to customer complaints
• Wrong design and improper installation, that may lead to mechanical and electrical failure, of: hardware such as corona ring, conductors ADSS etc…
• Shorted bells
• Loose hardware such as: spacers, slices, clamps etc.

Why UV Inspection?

The ability to easily detect corona and arcing sources and pinpoint their locations can save utilities considerable amount of money: The information obtained by UV inspection leads to:

• Prioritizing maintenance tasks
• Avoiding unnecessary line washings
• Concentraing on the faulty hardware
• Avoiding redundant testing and replacement of line elements not directly involved with corona generation

Inspection methods

• DayCor^®Superb - for foot patrol
• DayCor^®Rom - for airborne inspection
• DayCor^®Ranger - for driven inspection