[Thursday] Why 60hz electricity?

[fred tanner]

My B-47 had 400 cycle alternators because it was faster than 60 cycle.

[image: image.png]

On Sun, Nov 10, 2019 at 7:17 PM Ernie via Thursday <thursday at newsm.org>
wrote:

> Most Military is 400 cycle.
> Also most aircraft both civilian and military are 400 hz
>
>
> On Sunday, November 10, 2019, 11:14:33 AM EST, David Crowell via Thursday <
> thursday at newsm.org> wrote:
>
>
> Very interesting article. I seem to recall that US Naval ships use 400 Hz.
>
> Dave
>
> On Sunday, November 10, 2019, 10:34:50 AM EST, Chris Prata via Thursday <
> thursday at newsm.org> wrote:
>
>
> Yup, that's in the article. At midpoint there are Shin-Sinamo and Sakuma
> "Frequency Converter Station"s, which to me is pretty neat as well. I
> wonder if they are "dyna-motor" type mechanical, or some type of solid
> state...
>
> ------------------------------
> *From:* Michael Thompson <michael.99.thompson at gmail.com>
> *Sent:* Sunday, November 10, 2019 8:58 AM
> *To:* Chris Prata <chrisprata at live.com>; thursday at newsm.org <
> thursday at newsm.org>
> *Subject:* Re: [Thursday] Why 60hz electricity?
>
> Japan is still split 50/60 Hz at Nagoya. I believe the split was
> determined by the US/GB split after WW-II.
>
> On Nov 9, 2019, at 10:42 PM, Chris Prata via Thursday <thursday at newsm.org>
> wrote:
>
> Went looking for something on AC power utility history, because I think
> that's what everyone does on Saturday night right? Found this
> awesome writeup, with just enough tantalizing bits such as the various
> frequencies used locally until after WW2, that Calif. was split between
> 50hz and 60hz and so was Japan. Some systems ran at 16 2/3 hz
>
> Very interesting and fuel for more internet browsing, because I'd like to
> know how appliances were managed, were they produced locally for the
> various frequencies?
>
> A related story is the history of DC utility power which lasted into the
> 90's and maybe a bit beyond in NYC where some buildings were all DC, and
> appliances had to be bought for DC in those buildings.
>
> Anyway here is the 3 page piece on AC frequencies and it's even a pdf
> which can be saved:
> https://www.djtelectricaltraining.co.uk/downloads/50Hz-Frequency.pdf
>
>
>
>
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