Path: utzoo!censor!geac!torsqnt!lethe!yunexus!ists!helios.physics.utoronto.ca!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!think.com!spool2.mu.edu!uunet!zephyr.ens.tek.com!uw-beaver!cornell!rochester!pt.cs.cmu.edu!o.gp.cs.cmu.edu!fs7.ece.cmu.edu!sei!rsd
From: rsd@sei.cmu.edu (Richard S D'Ippolito)
Newsgroups: sci.electronics
Subject: Re: Sidereal Time Clock
Message-ID: <10012@as0c.sei.cmu.edu>
Date: 11 Jan 91 18:15:17 GMT
References: <3122@naucse.cse.nau.edu>
Reply-To: rsd@sei.cmu.edu (Richard S D'Ippolito)
Organization: Software Engineering Institute, Pittsburgh, PA
Lines: 16

In article <3122@naucse.cse.nau.edu> Robert Wier writes:

 > I was suprised to learn when the plant was shut down that they didn't
 > disconnect from the grid (for example, to clean the pipes and
 > turbine valves).  They just let the grid power the generators as 
 > large electric motors.  Said it was a whole lot easier than trying
 > to bring them up from a dead stop and re-synch them to the grid
 > (which had to be done by hand).  


There's another reason that _very_ large horizontally-mounted generators are
never stopped -- if they sat there for a long time, the weight would cause a
permanent flat spot in the shaft and bearings!


Rich