[Milsurplus] Mil generator

[ersmar at comcast.net]

Gents:


 -------------- Original message ----------------------
From: Richard Brunner <rbrunner at gis.net>
> 
> Re; Delta connected generators
> 
> Generators are usually Y connected because a delta connected generator 
> permits harmonic currents to circulate within the delta connection, 
> subtracting from VA available to the external load.  It is possible to 
> build a generator which merely circulates current and cannot supply a 
> load. (yes, it has been done, but not intentionally)  Delta connected 
> generators can be built, but are unusual.  The Y connected generator 
> also provides a convenient (neutral) grounding point.  Grounded vs 
> ungrounded systems is a whole 'nother controversy, and we are getting 
> too far off topic... (Ungrounded systems are not BAD!  At lv, system 
> transients are well within insulation strength, and an ungrounded system 
> is more reliable. 

While I was working in the electric utility industry I learned that delta-connected transformers and their power transmission line loads can suffer a single-line-to-ground fault without disrupting service.  That is, the system could have a tree fall onto one of the conductors on the line and not trip out.  


At hv it's a different story.)
> 
> Richard Brunner, AA1P
> 


73 de
Gene Smar  AD3F