Metering 3 phase grounded delta

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AmeL

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STL, MO
Having a hard time figuring out Yokogawa PR300. We are using it on 3PH 3W delta grounded system. Voltage and current readings are correct. The power factor is showing 0.4 and active power is negative. Using Yokogawa CW240 showed that the power factor is around .8.
Wired as shown in the manual for 3PH 3W system using 2Ct's and with Pt or no Pt we get the same results.
Anybody else experienced same challenges and what would be proposed solution.
As always your input and advice is very appreciated.
Thank you.
 
Did you check to see if your CT's are installed correctly? Your readings will be wrong if your CT polarity dots are not in the correct orientation.
 
Thanks,
I forgot to mention that we experimented changing polarities on CT's and that didn't work, we also tried putting the CT on grounded leg to see if that changes and all we get is false power reading. EX: @ 479V and 11.5A we get 0.4KW.
 
Just to update this post....

Just to update this post....

The Yokogawa instrument isn't made to work on this system;
Had a hard time getting anybody to actually say this ...

We replaced the instrument with a Power Logic PM200 by Scheneider El. and it works like a charm.

This morning Siemens rep e-mailed me as well guaranteeing that their 9300 series meters are now tested and proven to work on corner grounded systems.
 
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