[R-390] OT - Transmission lines - local

[Barry Williams]

No problerm here. Fascinating stuff. Just as interesting and on topic as 
arc flashes, imo.


the other other Barry
> Ok, I hear the grumbles - so my last post on this...
>
> On 2/24/2011 7:15 PM, James A. (Andy) Moorer wrote:
>> Let's see now - if I do the arithmetic correctly, that's a cool
>> /million/ watts.
>>
> Actually - a bit more...
> At sea our normal "ahead standard" was 112 turns on each
> shaft... which just happened to push us through the sea at
> roughly 12 knots.   At that speed (roughly 57% of Flank- or
> maximum effort) the generators were putting out roughly 1060
> volts @ 1414Amps - or roughly 1.49MWatts (per shaft,
> remember). Flank - which pushed the plants to capacity - was
> "rated" 1500V @ 2000Amps per shaft... or 6.0MWatts (combined
> both shafts) - which in "theory" should have pushed us to 22
> knots - but the best we achieved was 21knots.  BTW - the
> entire loop had a combined series resistance (motors,
> switches, buses, etc) of  .75ohms (that's *point seventy
> five* ohms)....
>
> Sorry if these "off topic" posts perturbed some folks -  in
> talking about the ship's propulsion systems, etc. - but I
> must note - while this part of the ship was shoving it's
> 19,000 tons of "us" around and supplying 120Volts to various
> equipments - those equipments included a goodly number of
> R-390As  which were still very much in use. So while that
> ship's propulsion and ship's service generators may be "off
> topic" - it was the environment and use that the R-390/A/1s
> were designed and meant for.   So if that part of their
> history is boring, sorry...  but the fact is - it IS part of
> these radio's heritage...
>