What is corona?
It is a luminous (visible at night) partial electric discharge that occurs through the ionization of air.
Appears when the local electric field exceeds the critical value of Ecritical = 24 – 30 kv/cm
What damage does it produce?
Degradation of polymeric insulators (NCI)
Physical damage to the components.
Cement cracks between metal parts in porcelain insulators.
Degradation of the cable insulation
What can be done once detected?
Wash the affected equipment
Replacement of components
Silicone coating application
We will make recommendations based on the complete assessment of the machine.