Main Question or Discussion Point
For the locked rotor test I have these values,
P1 = 620W
Stator line voltage = 32V
Stator line current = 8.4A
To calculate active power/phase,
Po = (P1+P2)/3
But I don't have P2, Is P1 maybe equal to P2 ?
i doubt it - that only happens at power factor 1.0Is P1 maybe equal to P2 ?
Yes, it isi doubt it - that only happens at power factor 1.0
These show why.
Is this a lab ? Using those links you could calculate what P2 should read , then go back to the bench and see how close you came.
What you measured on the voltmeter and ammeter.then what is VL and IL
Good one ! I missed that, admittedly i didn't try out your numbers....If I use VL = 32V and IL = 8.4A and Wa = 620W
620 = 32*8.4*cos(30+∅)
cos(30+∅) = 2.31
But that cant be true
i didnt do anything, but thanks for the feedback.Yeah, I think the wattmeter reading might be wrong. Will have to check it up in the lab again.
The actual current measured on the ammeter was 4.2A, but the CT ratio is 2:1 so 4.2A*2 = 8.4Ai didnt do anything, but thanks for the feedback.
8.4 amps is the current measured where ? If on your 5 amp ammeter, the CT is being overworked and likely is introducing undue phase shift.... and so is the wattmeter's current coil..
Labs teach us more through serendipity than through the intended lesson.
Like Thoreau's Bean Field.
The actual current measured on the ammeter was 4.2A, but the CT ratio is 2:1 so 4.2A*2 = 8.4A