Multifunction Meter Three Phase Problem

I have the one of the different scenario, (Three phase system)
In ION 6200 Multifunction meter ,
The phase currents in the individual phases are 33.7A, 43.6A, and 56.3A
The Phase voltage is 245.7 ,247,247
The Line to Line voltage is 426 .8 ,429 and 427V
The individual phase powers are 5 kW,6.9 kW and 10.7kW
Individual Phase Power factor 0.62, 0.69 and 0.68

The Multifunction meter reads

V average = 428V
I average =45A
Power factor = 0.994
kVA (Apparent power) = 22.8 KVA
KW = 22.8 KW

If I verify the above power readings with the help V ave , I ave, PF

Power = 1.732 x 428 x 45 x 0.994 = 33.158 KW which is not matching the meter indicated reading of 22.8 KW.

Moreover the summation of individual powers of each phase ( 5 + 6.9 + 10.7) is same as the power indicated in the meter. wherein the actual calculated power as shown above is not in line with the meter reading.

Can any one help me to know the exact calculation.


asked 1/13/2013

1 Answer

It looks to me as though there may be problem with the power factor of 0.994. Can you retest this.

If you use a power factor of 0.66 (average of 0.62, 0.69, and 0.68) in your calculation, you end up with 22 kW. This is more or less the correct answer.
answered 1/14/2013 Steven McFadyen 246
Steven McFadyen

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