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No-Load Test

  • Introduction
  • Theory
  • Procedure
  • Experiment
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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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