What is corona effect. I have seen in power house that
hissing sound often comes mostly from a dam station from high tension line
ie 132 Kv. Line and sparks were observed going one place to another place
though its length.
When the voltage is high enough, electrons are attracted to ground (at
lower potential) with sufficient energy to ionize air. It is this breakdown
that produces the corona.
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Update: June 2012