If the voltage in over headline is increased at a particular voltage surrounding air breaks and there is bluish glow like flash This is corona.Like lightening arrestor how corono effect can be decreased
It is very rare that an existing power distribution node can be easily and safely modified to prevent corona losses. IMHO Most of the times a significant corona loss happens at a station when the initial designers of an installation underestimate future weather conditions that will happen at a switching station. One may be able to use more appropriately designed insulators and corona rings to retrofit at a specific location when initial designs are insufficient. At the same time, simple tree triming can solve many problems.
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