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From: white@cogito.dec.com (Robert V. White MLO6A-3/T96 223-7647)
Newsgroups: sci.electronics
Subject: Power System Frequency Keeping
Message-ID: <9779@decwrl.DEC.COM>
Date: Fri, 8-May-87 18:04:16 EDT
Article-I.D.: decwrl.9779
Posted: Fri May  8 18:04:16 1987
Date-Received: Sat, 9-May-87 21:48:17 EDT
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
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> Path: decwrl!decvax!ucbvax!ucbcad!ames!hc!beta!cmcl2!phri!roy
> Subject: Re: Syncronizing Generators

>	A good question to ask is "with all these random (albeit
>synchronized) generators all over the place, what's to keep the grid
>frequency from drifting?"  The answer is that somewhere on the grid,
>somebody is monitoring the line frequency, and comparing it to a standard
>(WWV, probably).

>Roy Smith, {allegra,cmcl2,philabs}!phri!roy

I believe that the monitoring is done by American Power Corporation in 
Canton, Ohio using a Cesium time standard.

Bob White
Corporate Power Conversion R&D
Digital Equipment Corporation
Maynard, Massachusetts