Three Phase Power Measurement
Balanced Load
Procedure:
1. Set the 3Phase (Line to Line) voltage 100 V at frequency = 50Hz.
2. Set the balanced load value.
3. Switch on the supply to get the meter readings and click on "Fill the Table" button to update the observation table.
4. Compare calculated power (W
C
) with the measured power (W
M
) for each observation.
5. Then change the balanced load value to take another observation.
N.B.: Click on the fuse indicator to repair it, if it got fused.
3-phase supply
(L-L Voltage in Volt)
Frequency (in Hz)
R
1
=R
2
=R
3
(in Ohm)
V
Observation Table
Serial no. of Observation
V
RY
I
R
(Amp)
Cos(V
RY
, I
R
)
V
BY
I
B
(Amp)
Cos(V
BY
, I
B
)
I
3
(Amp)
W
1
W
2
W
C
(Calculated power)
W
M
(Measured Power=W
1
+W
2
)
1st
2nd
3rd
4th
5th
Unbalanced Load
Procedure:
1. Set the 3Phase (Line to Line) voltage to 100 V at frequency =50Hz.
2. Set different values for R
1
, R
2
and R
3
.
3. Switch on the supply to get the meter readings and click on "Fill the Table" button to update the observation table.
4. Compare calculated power (W
C
) with the measured power (W
M
) for each observation.
5. Change the values of R
1
, R
2
and R
3
to take another observation.
N.B.: Click on the fuse indicator to repair it, if it got fused.
Frequency
(in Hz)
Observation Table
Serial no. of Observation
V
R
V
y
V
b
I
R
(Amp)
I
Y
(Amp)
I
B
(Amp)
W
C
(Calculated power)
W
1
W
2
W
M
(Measured Power=W
1
+W
2
)
1st
2nd
3rd
4th
5th