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#39340 - 06/16/04 08:47 PM power factor  
Rabbit  Offline
Joined: Jan 2002
Posts: 62
Kingsport Tennessee
Anyone here installed power factor correction before? Did it pay off for your customer? Did it pay off for YOU?


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#39341 - 06/16/04 10:45 PM Re: power factor  
twh  Offline
Joined: Mar 2004
Posts: 905
Regina, Sask.
I did a fair bit of it on oil wells a few years ago. My understanding was that it paid off for the customer in about 3 months, running 24 hours a day. With over 600 wells for one customer, how could it not pay off for the electrician?

In the case of an oil well, it is easy for the customer to track the savings (one meter per well with nothing else on the meter).

If you need to spend hours talking the customer into trying one, it may not pay off for you, and if they have a lot of other equipment, they may not notice the savings.

[This message has been edited by twh (edited 06-16-2004).]

#39342 - 06/16/04 11:22 PM Re: power factor  
Bob  Offline
Joined: Feb 2002
Posts: 182
Mobile, AL, USA
Is the customer being billed on a KVA demand?
Can you post the present power factor and cost per KVA?

#39343 - 06/17/04 12:24 AM Re: power factor  
Bjarney  Offline
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Without careful study of the billing utility’s rate schedule and setting up a spreadsheet, there is almost no way to tell.

#39344 - 06/17/04 08:50 PM Re: power factor  
Rabbit  Offline
Joined: Jan 2002
Posts: 62
Kingsport Tennessee
No one building in particular. Just wondering in general.

#39345 - 06/18/04 08:05 PM Re: power factor  
e57  Offline
Joined: May 2003
Posts: 2,876
Most utilities correct to a certain margin, (About 1)don't they? Most urban, and sub-urban areas at least. Around here they do, I see thier cap's all over the place.

Mark Heller
"Well - I oughta....." -Jackie Gleason

#39346 - 06/20/04 07:15 PM Re: power factor  
Trumpy  Offline

Joined: Jul 2002
Posts: 8,211
SI,New Zealand
The capacitor banks used by utilities are usually only used to correct the p.f on thier Distribution systems, to correct the Inductive effects of transformers, etc.
Over here, large users of electricity are penalised by higher Tariffs, that have a power factor under a certain figure (0.65 lagging, I think).

Let's face it, these days if you're not young, you're old - Red Green grin

#39347 - 06/20/04 08:00 PM Re: power factor  
e57  Offline
Joined: May 2003
Posts: 2,876
In situations like that I guess it would pay off, wouldn't it?

Mark Heller
"Well - I oughta....." -Jackie Gleason

#39348 - 07/14/04 05:59 PM Re: power factor  
SolarPowered  Offline
Joined: Jul 2004
Posts: 625
Palo Alto, CA, USA
Does the standard kWH meter register watts or VA? I've always been under the impression that it measures actual watts, not VA.

#39349 - 07/15/04 12:52 AM Re: power factor  
Tesla  Offline
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
Most tariffs, IIRC, start spanking commercial users as their power factor slides below .80....

Such customers will typically have dual metering mandatory -- 1000A in my area....

When the PoCo sees poor power factor they bill 'em under their tariffs.

You can read the meters, yourself. If the powerfactor drops to .75 -- the prospect is getting dinged, one way or the other.

Inductive loads trigger this, in my area, think air conditioning....loads of magnetic ballasts would perform likewise.

Poor powerfactor triggers major capital expentitures by the PoCo. They have to upsize everything up the line until it is corrected.


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