Analyzer records 0.1 Power Factor
Analyzer records 0.1 Power Factor
(OP)
I installed a power analyzer to monitor the kVARs being drawn at a Water Pumping (Booster Station) site. When the pumps are not running, I get power factor (PF) as low as 0.111 (lagging). The PF rises to about 0.9 when the station is pumping water. I am wondering why I get 0.111PF when the pumps are not running.






RE: Analyzer records 0.1 Power Factor
Please think, you have answer in your Q.
Not pumping---not current--- continiue by yourself---
Believe me, you know answer.
Regards.
Slava
RE: Analyzer records 0.1 Power Factor
However, I want to make the following clarifications:
1)I am monitoring the 11kV incomer panel of a 6MVA 33/11kV transformer.
2) The pumping station has offices and lighting system. Even when there is no pumping going on, there is still some load being served. (The Analyzer records about 20kVA).
I hope this additional info throws more light on my previous Q.
RE: Analyzer records 0.1 Power Factor
Now Q is clear, and we think about options.
Cheers.
RE: Analyzer records 0.1 Power Factor
It's possible becouse few reasons:
1. meas errors, 20VA is about 0.3% of nominal load.
2. big losses on the aux trafos with this low loads.
3. lighting load with serious reactive components.
Wait to others.
Regards.
Slava
RE: Analyzer records 0.1 Power Factor
RE: Analyzer records 0.1 Power Factor
The kVAR values increase when the pump are running. I want to find out the source of the kVARs. If you have huge motors in the "standby" mode, does it draw any VARs?
RE: Analyzer records 0.1 Power Factor
Bill
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"Why not the best?"
Jimmy Carter
RE: Analyzer records 0.1 Power Factor
RE: Analyzer records 0.1 Power Factor
I think are 4 trafo iron and cooper losses.
Are you have additional aux trafo for lighting and office.
If yes, disconnect trafos on the 11kV side and check your PF.
Regards.
Slava
RE: Analyzer records 0.1 Power Factor
The magnetizing VARs remain constant so as the load drops so also does the power factor.
Bill
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"Why not the best?"
Jimmy Carter
RE: Analyzer records 0.1 Power Factor
Yes, definitely. That is almost all they consume when not loaded. Current is mostly magnetizing current, which is 90 degrees lagging. So, expect a very bad power factor. That is if "Standby mode" means running but with no load on shaft.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Analyzer records 0.1 Power Factor