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#129776 08/18/05 05:05 PM
Joined: Dec 2004
Posts: 1,064
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How does a Delta vs Wye change PF?

Any clues?


Dnk.....

#129777 08/18/05 09:53 PM
Joined: Feb 2002
Posts: 182
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Bob Offline
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How does a Delta vs Wye change PF?
It doesn't. Load has a specific PF. Voltage has nothing to do with it. A motor generally has a lagging PF and a capacitor has a leading PF. Check Here for more info. http://www.ibiblio.org/obp/electricCircuits/AC/AC_11.html


[This message has been edited by Bob (edited 08-18-2005).]

#129778 08/19/05 05:53 AM
Joined: Dec 2004
Posts: 1,064
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That's what I thought too.

I am doing PF testing and harmonics testing with a Fluke 434, and downloaded the new firmware to correct some bugs in it.

On a 480X240/120ct transformer I am monitoring, if you switch from delta to wye on the Fluke, the PF changes from .67 to .94.

I am curious why, they should be the same measurements unless somehow they get measured differently in the meter.

But that makes no sense..

Thanks.

Dnk.....

#129779 08/19/05 06:18 AM
Joined: Dec 2004
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Or is it a Phase-Line PF, and then a Phase-Phase PF?

That would make sense, wouldn't it?


Dnk..

#129780 08/19/05 06:34 AM
Joined: Sep 2003
Posts: 650
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Only if the 'delta' connection tells the meter that the current sensors are in the phase to phase circuits, but the voltage connections are being made at the terminals.

Once you have the three conductors coming off the transformer, the power factor measurement should be the same.

-Jon

#129781 08/19/05 01:03 PM
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Ron Offline
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A delta to wye transformer doesn't change the PF, but depending on how the meter makes the PF measurement, you may need to know that the delta to wye windings result in a 30 degree phase shift from primary to secondary.
Since PF is essentially measuring phase shift of voltage relative to current, that setting you describe on the meter may effect the reading.


Ron
#129782 08/19/05 02:41 PM
Joined: Dec 2004
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It must be the phase-line reading, I measured another trans today and switched from delta-wye and the PF readings were about the same.

I will contact Fluke and let you know if your still interested.

Thanks for your help.

Dnk.....


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