A single-phase, 4 kVA, 200 V/100 V, 50 Hz transformer with laminated CRGO steel core has rated no-load loss of 450 W. When the high-voltage winding is excited with 160 V, 40 Hz sinusoidal ac supply, the no-load losses are found to be 320 W. When the high-voltage winding of the same transformer is supplied from a 100 V, 25 Hz sinusoidal ac source, the no-load losses will be_________ W (rounded off to 2 decimal places).
All supplies have V/f = 4, so peak flux density is unchanged. Write core loss as \(P=Af+Bf^2\). The measurements give \(50A+2500B=450\) and \(40A+1600B=320\), so A = 4 and B = 0.1. At 25 Hz, \(P=4(25)+0.1(25)^2=162.50\,W\).
Important Questions from Transformer Core Losses
Eddy current loss in a transformer can be reduced by _________.
Out of the following, which loss is also a category of magnetic losses?
Transformer at no-load behaves like:
In transformer, hysteresis loss depends on:
How can eddy current loss be minimised in Transformer?
