Re: [coldwarcomms] 508A power supplies; power systems in general.
- View SourceOn 8/1/11 1:31 AM, widebandit wrote:
> Some TD2 sites way out in the boonies - like Cutter New Mexico - were fed by a single wire(!)...Wow; SWER <https://secure.wikimedia.org/wikipedia/en/wiki/SWER> is not
common in the US.
Did everything in TD2 run off of battery plant directly?
> TH radio (BSTJ November 1961) used three-phase power to run synchronous motor-alternators...<http://www.alcatel-lucent.com/bstj/vol40-1961/articles/bstj40-6-1627.pdf>
is an interesting read.
I have no idea how the synchronous motor with no excitation works. It's
common to start a synchronous motor via induction, then apply excitation.
The self-excited generator is now pretty common.
The dual motor scheme is an old idea; I recall a pipeline firepump with AC
and diesel powerplants straddling the pump.
> With TH radio, the decision was made to feed the bays with "firm AC" and derive necessary DC potentials locally...Note the 508A had a fair-sized flywheel; clearly that was an important
aspect of the design. A large flywheel was a good filter, and bridged the
spikes of going from one power source to the other.
Note many ISP's are using a similar scheme; HiTek units are used at some
carrier hotels [hosting sites...]. They last long enough for the Diesel to
start & get to speed.
I see mention of L-carrier in the above; so coax undergrounds used 508A's