A transformer on no-load has a core loss of 50 W, draws a current of 2A and has an induced EMF of 230 V. Determine the no-load power factor and core-loss current.
A transformer on no-load has a core loss of 50 W, draws a current of 2A and has an induced EMF of 230 V. Determine the no-load power factor and core-loss current.
Right Answer is:
Power factor = 0.108 lagging, core-loss current = 0.216 A
SOLUTION
Given:
wattmeter reading Wo = 50 W
voltmeter reading V1 = 230 V
Ammeter reading I0 = 2 A
Iron loss of the transformer, Pi = W0
W0 = V1 I0 cos ϕ0
50 = 230 × 2 × cos ϕo
cos ϕ0 = 0.108 lagging
Core loss component
IW = Iocos ϕo
IW = 2 × 0.108 = 0.216 A