FW: Commercial AC power outage - restore Voltage ?

[William Fenn]

Our biggest problem at WRC, before we got a rather large UPS for the
building technical power, was the hysteresis of the Iron in all of the
transformers in the technical equipment.  If the voltage was at its peak in
the voltage phase when it failed and 180 degrees out of this phase when it
was restored we would get one hell of a surge.  This surge provided a lot of
overtime for the engineering department due to the amount of problems it
produced in the system (smelly burned resistors, shorted diodes, dead
transformers and the like). 

Other than that, voltage would come back at the same level as when it went
bye bye.

N4TS

-----Original Message-----
From: tacos-bounces+bfenn=cox.net at amrad.org
[mailto:tacos-bounces+bfenn=cox.net at amrad.org] On Behalf Of Rob Seastrom
Sent: Thursday, August 22, 2013 7:21 AM
To: 3t3
Cc: AMRAD reflector
Subject: Re: Commercial AC power outage - restore Voltage ?


3t3 <3t3 at comcast.net> writes:

> When the electrical power companies restore electrical power to a
> neighborhood after a widespread power outage, what initial "start up"
> voltage do they send out on the line to accommodate the
> instantaneously huge start up current surge needed to get "back on the
> air" in a "stable" condition ?

I'm given to understand they bring it back a neighborhood at a time,
not a couty at a time, which keeps the inrush current to something the
grid can handle rather than making the generators and turbines leap
off their mounts and exclaim "I think not!".

-r


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