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Re: DC Supply
At 06:29 21/09/98 -0600, Greg Leyh wrote:
>> Have genuine 3-phase to my house to supply a large air-conditioner. Could
>> use this, but will need a friendly electrician to supply parallel outlets
>> with same. IF I could phase shift AC supply to 3 NSTs (propose 10 kV / 120
>> mA each) then rectify this, seems this would be a good solution.
>
>Wow, you're all set! Just hang a NST on each phase.
>Tapping the A/C power seems much easier and more fun
>than trying to build a phase shifter.
OK. I am starting to build a picture in mind.
Already have a 30A x 3-phase line filter (Fuji) which I found at the "junk"
store for $20.
The "other shop" has a straight/parallel 3-phase variac at 15A per winding.
NSTs are readily available. Not cheap, but are good quality units. The
15kV/60mA ones I have are *very* robust, so I imagine the 120mA variety
will only be stronger.
NOW ...... further to the inspiration above from Greg, I need some input
from the local Aust./NZ contributors. What is going to be a good choice
for rectification. I am assuming Greg was not "tongue-in-cheek" in the
above, so we are talking about full-wave rectification times 3-phase ........
Anyone got a round dozen HT rectifiers lying around ??
(I am assuming I will need one bridge per phase)
The other question not answered thus far was would the rectifiers help
protect NSTs from return spikes ?
If I do build a DC supply what type of protection circuit would then be
optimal ?
All ideas/comments welcomed.
Mark
http://www.cobweb-dot-com.au/~dkfinnis