Answer / deepakrocks4all

As the alternating voltage on a line conductor system is
raised beyond a certain limit, a point is reached when a
faint violet glow appers on the conductor surface,with
hissing noise and a smell of ozone.this phenomenon is
colled corona

Answer / surender kumar

It is found in above 11 KV voltage transmission &
distribution line
[1] due to raise in voltage.
[2]Reduction in gap between the line conductors.
[3]air insulation level reduction due to natural weather.

In apearance it is faint circular glow having violet in
colour producing hissing noise.

Answer / v.venkata ramana

The Phenomena of hissing noise and visible glow is called
corona

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