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first u should know the factors that affect corona.
1. is frequency . as long as frequency is stable there would be less corona.
2. t line voltage - whenever line voltage exceeds the desruptive critical voltage the ions in atmosphere ionises and causes corona.
3. is ofcouse atmosphere as u feels corona in rainy days a lot . now u know the reason why.
4. last is line current.
there is solution of DC transmission line as it offer less corona
1-good insulators
2- maximize distance between conductors
3-no sharp points