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'[OT] Re: A.C.Power - In The Beginning (off topic)'
1998\01\30@101701 by Montaigne, Mike

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Wasn't the first frequency used in North America 25 HZ?  At 25Hz, they
could see the
flicker in a ordinary light bulb and they used this to synchronies
another generator when
they wanted to supply more power to the line.  Perhaps 50Hz came by just
doubling 25 Hz.
Now how did we get 60 Hz?

{Quote hidden}

1998\01\30@132110 by Charlie McCook

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>flicker in a ordinary light bulb and they used this to synchronies
>another generator when
>they wanted to supply more power to the line.

Professor Wiley Hartzog (Auburn U.) said they put a bulb between the two
lines, and when it went out, they threw the knife switch to bring on the
other generator.

1998\01\30@155409 by Alberto Smulders

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-----Mensaje original-----
De: Charlie McCook <EraseMEk4ycspam_OUTspamTakeThisOuTAMERICA.NET>
Para: PICLISTspamspam_OUTMITVMA.MIT.EDU <@spam@PICLISTKILLspamspamMITVMA.MIT.EDU>
Fecha: Viernes 30 de Enero de 1998 14:27
Asunto: Re: [OT] Re: A.C.Power - In The Beginning (off topic)


>>flicker in a ordinary light bulb and they used this to synchronies
>>another generator when
>>they wanted to supply more power to the line.
>
>Professor Wiley Hartzog (Auburn U.) said they put a bulb between the two
>lines, and when it went out, they threw the knife switch to bring on the
>other generator.

Not one bulb, but two in series (because one will burn out immediately); the
normal way is to use six bulbs,  two between corresponding fases of the two
generators; when all bulbs are out, you can put the second generator on the
distribution bars, because that way they are phase synchronized. Have done
myself this way with two hydro-powered 50 kVA generators somewhere in
Northern Argentina, in a small Andes-town...

Albert Smulders
InSAD - Encarnaci—n, Paraguay
KILLspaminsadKILLspamspamitacom.com.py


'[OT] Re: A.C.Power - In The Beginning (off topic)'
1998\02\01@074847 by paulb
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Alberto Smulders wrote:

> Not one bulb, but two in series (because one will burn out
> immediately); the normal way is to use six bulbs,  two between
> corresponding phases of the two generators; when all bulbs are out,
> you can put the second generator on the distribution bars, because
> that way they are phase synchronized. Have done myself this way with
> two hydro-powered 50 kVA generators somewhere in Northern Argentina,
> in a small Andes-town...

 Of course.  Even if you use bulbs of a higher voltage, you want a bit
of leeway as if they burn out you could get the wrong idea.  Two bulbs
in series are also used to allow testing between phases (three-phase
system presumed).

 You didn't mention the reason of course for using the bulbs across all
three phases rather than just the first.

 Cheers,
       Paul B.

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