When there is an electric field between two conductors, the electrons and ions present in the air are subjected to a force that moves them in opposite directions, these particles begin to collide with each other and, if the field is strong enough, a dielectric breakdown will occur, forming an electric arc between both conductors. The arcing from this event can produce a hissing or crackling noise around the conductors, as well as a UV light. But the most worrying thing is the generation of ozone, which is corrosive to conductors.

The factors that contribute to the formation of corona discharges and partial discharges are:
1- Atmospheric pressure
2- Humidity
3- Temperature
4- Pollution

EFFECTS & DAMAGES

The chemically active gases generated by this phenomenon such as ozone (O3) and nitrogen monoxide (NO), evolve to nitrogen dioxide (NO2) and nitric acid in humid environments. This nitric acid is what produces the chemical damage to the components.

If the corrosion is not detected before the mechanical failure, it will result in the conductors' damage.

It is important to locate this phenomenon; In this sense, the Ultraviolet cameras or coronagraphy cameras (corona effect camera), allow visualizing the UV radiation emitted by external partial discharges, they also have solar filters for measurement in broad daylight.

BEST SOLUTION : COMPOUND UV34

The four-in-one payload (UV+UAV system) carries a UV sensor, an IR thermal imaging camera, a Zoom EO Camera, and a ToF sensor. Its UV sensor can detect ultraviolet sources, such as partial discharges or wildfires. It is also worth pointing that the camera is “blind” to the UV radiation coming from the sun, allowing only the relevant UV radiation to pass though the sensor.