Bergey or Whisper [RE-wrenches]

[hugh piggott]

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>  it's dc transmission to the controls. Wire will have to be
>sized accordingly larger compared to the 3-phase ac of the Whisper.

the idea that the wire loss is greater with dc than with 3 phase ac 
is a very common fallacy. the rms current in each wire is about 0.8 
times the dc current.

3 phase ac is only advantageous where the line voltage becomes 
greater than the end user voltage.  this is not the case with 3 phase 
supplies to rectifiers.

dc is actually slightly more copper-efficient than 3 phase ac.  each 
wire may need to be slightly larger, but overall you save copper 
because you only use 2 wires.
-- 
Hugh

down in Birmingham for a seminar about alternators.
http://www.scoraigwind.co.uk

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