[Prev][Next][Index][Thread]
Re: DC Supply
At 04:16 24/09/98 -0600, Greg Leyh wrote:
...Snip...
>Remember, with center-tap grounded secondaries, the windings
>cannot be connected directly together in either delta or wye,
>since now you will have *six* phases to worry about (2 per
>CT'ed secondary).
>Each secondary HT terminal must go to its own full-wave
>rectifier set (consisting of 2 stacks), and the DC outputs
>of the rectifier sets can then be bussed together.
>
> ---------------------- +
> |_
> D^
> |
> HT ------o
>(6 places) |_
> D^
> |
> ---------------------- -
>
>The resultant DC voltage will be symmetrical around ground.
Greg, Jim, Bert H, Malcolm & Others,
I don't get this. Surely the two NST secondaries, centre-tapped are
*in-phase* with each other. There can only be 3 phases, to have 6 would
imply phase shifting by the transformer ????
Imagine using paired MOTs on each of the 3 phases, running the secondaries
in series ....... why would they be out-of-phase ?
The real question is "what to do with the centre taps". Jim Lux, who
started this question, thinks I should still ground them.
To my simple medical mind. The only effect grounding the centre-tap should
have is to reference the rails to +/- 7.5 kV, as opposed to "15 kV floating
in the breeze".
Following Greg's diagram above. Surely this would give me 7.5 kV rectified
at double the amps, cf. 15 kVAC ??
As stated, I am **WAY** out of my depth here .......
Some other EE or experienced coiler care to comment ...... PLEASE !
thanks ......
Mark
http://www.cobweb-dot-com.au/~dkfinnis