Electrical discharges into air cause the formation of the corona phenomenon.
The corona phenomenon is the fluorescence of air, the fluorescence signature is mainly in the UV range with a small portion in the visible blue range.
The discharges cause power loss and causes damage to surrounding hardware.
Electrical discharge into air can occur on many HV equipment.i.e.
- Generator / motor windings
- Along power lines
- On insulators
- On transformers / substation switch gear, etc.
Being able to detect and localize the discharge, caused by a fault situation, allows maintenance staff to identify the cause and effect the right corrective action.