Corona and arcing detection in high voltage transmission lines maintenance
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.
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| Corona on broken strand | Corona on spacers | |
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| Bird dropping 500kV | Corona due to brittle fracture |
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