Corona and arcing inspection in railway electrical lines
The use of DayCor® Rail to inspect railways electrical lines has proven to contribute fidelity and reliability to the mass transportation means. DayCor® Rail is designed to be effective for detect and report automatically faults that should be of concern to railways companies, such as:
- Contamination - coastal salt, industrial vapors and dusts, cement dust, highway road-salt, tire dust and car emissions, agricultural dusts and fertilizers
- Cracked insulators
- Eroded cement of pin insulators
- Rusted hardware
- RFI, TVI and audio noise sources lead to customer complaints
Why UV Inspection?
Of the various inspection techniques, UV inspections is unique in its capabilities to detect and locate accurately and immediately sources of corona and arcing. UV inspection therefore can save considerable amount of money by eliminating the need to test "blindly" bulks of insulators and refrain from 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 DayCor®Superb.
- Driven inspection by using the DayCor®Rail
DayCor®Rail automatic operation & reporting system and high pinpointing resolution of corona and arcing sources save considerable amount of money to utilities, by avoiding unscheduled outages, testing of many insulators and the replacement of line elements not directly involved in generation of corona.
Corona will appear when the local electric field exceeds a critical value
E critical = 24-30 kV/cm.
Since corona phenomena depend on the electrical field value, it may occur in low voltages as well.