Corona and arcing detection in overhead power distribution lines
UV inspection of distribution lines is an important procedure to ensure utilities reliability and detect detrimental faults
DayCor® technology can easily detect and locate cases of:
- Contamination - coastal salt, industrial vapors and dusts, cement dust, highway road-salt, tire dust and car emissions, agricultural dusts and fertilizers
- Improper attachment of conductors to insulators (tie wire)
- Cracked insulators
- Improper grounding or bonding lead to wooden poles fires and are safety hazards
- Eroded cement of pin insulators
- Defective terminations
- Rusted hardware
- RFI, TVI and audio noise sources lead to customer complaints
Why UV Inspection?
Straightforward and immediate location of corona and arcing sources saves utilities considerable amount of money, since it eliminates the need to test "blindly" a bulk of insulators and redundant replacements of grid elements.
Can Corona occur in low voltage?
Corona will appear when the local electric field exceeds a critical value
E critical = 24-30 kV/cm.
Since corona phenomenon depends on the electrical field value, it may occur in low voltages as well.Inspection methods
- Foot patrol by using the UVollé.
- Driven inspection by using the DayCor®Ranger.