Shakshat Virtual Lab
INDIAN INSTITUTE OF TECHNOLOGY GUWAHATI
No-Load Test
From the experiment performed we get,
Current = 1.406 A
Voltage = 127 V
W1 = 0.133 W
W2 = 0.270 W
We are to calculate the following values.
1. No load power factor (cos φ0) = ω0 / √3 V0 l0
2. lω = l0 cos φ0 / √3
3. Working component of current lm = l0 sin φ0 / √3
4. No load resistance = R0 = V0 /Iw
5. No load reactance = X0 = V0 /Im
W0 = W1 + W2 = 0.403 W
1. cos φ0=0.403/309.27 = 0.0013
Therefore φ0 = 89.90
lω = l0 cos φ0 / √3
=(1.406 x 0.0013)/1.732
=0.001 A
3. Im = 1.406 x sin 89.9o
0.81 A
4. R0 = V0 /Iw
127/0.001=127000 Ω
5. X0 = V0 /Im
127/0.81 = 156.79 Ω
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