[Milsurplus] Mil generator

[WA5CAB at cs.com]

Actually, as Young Bill is always hanging me with, don't never say never.  
Years ago Houston Lighting and Power (more commonly known as Houston Looting and 
Pillage) had a bastard hookup installed in one of our pipe coating plants 
that produced 120/240 single phase and 240 3 phase delta.  It consisted of a 
delta connected 240 volt transformer bank.  The center-tap of one (only) of the 
secondaries was grounded and used as the neutral for the single phase loads.  
Don't ask me why they did it that way unless they had a 240 volt delta load but 
had bought a bunch of 120 volt relays surplus.  The part of our coating plant 
where the transformer bank was located was torn out shortly before I became 
involved, and Irebuilt it and had the bank reconfigured as standard 120/208 wye. 
 But I admit that it was a very unusual hookup and that the single phase 
loads are limited to no more than 1/3 of the total bank power.  240 volt circuits 
usually imply single phase.

Two phase (90 degree phase angle) was used at one time in servo systems.  But 
not to my knowledge in power distribution systems or portable generators.

In a message dated 3/11/2006 8:14:09 PM Central Standard Time, jfor at quik.com 
writes: 
> Kenneth G. Gordon wrote:
> 
> >[snip] In any case, there is really no way you can get 120 VAC on any one
> >phase, and then have a full 240 VAC between any two phases.
> >Because of the phase differences, the total voltage is always 208 VAC
> >in that case, but you already HAVE that as one of the outputs: the first
> >one you listed.[snip]
> 
> You can get a flat two phase, 120-0-120 (in fact two of them, 90 degrees 
> shifted) by using
> a Scott connected trnsformer. I don't know how much they cost.
> 

Robert Downs - Houston
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MVPA 9480
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