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Answer Posted / raghu
Very difficult to generate HVDC due to commutation probs..
cannot vary voltage levels easily.. most of the loads are
ac loads like induction motors.. transmission has to be
point to point and difficult to tap power.. cost of using
rectifiers and inverters is too high..etc..
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Practical condition in 400KV Sub station:- Breaker(open) , isolator(open), Earthing (close) at both end e.g A & B. Now Open A Stn Earthing than Open B stn Earthing (Which have a 50MVA reactor) , AND suddenly show R,Y,B phase 704KV,573KV,118KV respectively. Que is without closing of breaker how it is possible.???? My Whats app No:07621840498 for Further Discussion. Pls experts suggest.
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