Re: CO backup power (was Re: [telecom] FiOS in MDU Buildings [Telecom]
- From: David Lesher <wb8foz@xxxxxxxxx>
- Date: Tue, 19 May 2009 23:41:33 -0400 (EDT)
***** Moderator's Note *****
OK,I'm thick, so bear with me: I though air conditioners, or any AC
motor for that matter, had capacitors in them to help them start, and I
don't understand why they would be an inductive load.
Plus, how could Con Ed compensate for an inductive load? Wouldn't
it take gargantuan capacitors on every pole, or are the loads only
inductive when the motors first start?
The caps in most motors are starting-only; only a few motors are "cap
start/cap run" and those are usually bigger. So the normal grid load is
always inductive.
[The starting cap in an induction motor creates a 90 deg phase shift
so that the starting and running windings give the one-two umph
to get the motor going.]
Yes, ConEd would have to add cap banks to improve the PF. (I see them on
PEPCO poles all the time.) On industrial accounts, utilities often nick
you a "bad PF" surcharge. I've speced and installed cap banks at pump
stations for that reason.
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- Re: [telecom] FiOS in MDU Buildings [Telecom]
- From: Wesrock
- Re: [telecom] FiOS in MDU Buildings [Telecom]
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