[Thursday] Why 60hz electricity?

[Chris Prata]

well here's the ac being turned on in this WW2 B-17 training film. even shows a dynamotor! pretty cool...

https://youtu.be/vOl5YpFVGYU





________________________________
From: fred tanner <fredfbceg at gmail.com>
Sent: Monday, November 11, 2019 12:26 PM
To: Ernie <ernie176 at yahoo.com>
Cc: Michael Thompson <michael.99.thompson at gmail.com>; Terry Gmail via Thursday <thursday at newsm.org>; Chris Prata <chrisprata at live.com>; David Crowell <ka1edp at yahoo.com>
Subject: Re: [Thursday] Why 60hz electricity?

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

[image.png]

On Sun, Nov 10, 2019 at 7:17 PM Ernie via Thursday <thursday at newsm.org<mailto: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<mailto: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<mailto: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<mailto:michael.99.thompson at gmail.com>>
Sent: Sunday, November 10, 2019 8:58 AM
To: Chris Prata <chrisprata at live.com<mailto:chrisprata at live.com>>; thursday at newsm.org<mailto:thursday at newsm.org> <thursday at newsm.org<mailto: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<mailto: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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