A single-phase \(400\;V,\;50\;Hz\) transformer has an iron loss of \(5000\;W\) at the rated condition. When operated at \(200\;V,\;25\;Hz\), the iron loss is \(2000\;W\). When operated at \(416\;V,\;52\;Hz\), the value of the hysteresis loss divided by the eddy current loss is ______.
V/f stays constant, so flux density is unchanged and iron loss is af+bf². From 5000=50a+2500b and 2000=25a+625b, a=60 and b=0.8. At 52 Hz, hysteresis loss=3120 W, eddy loss=2163.2 W and ratio=3120/2163.2=1.44231.
Important Questions from Transformer Copper Losses
For a single phase transformer, the maximum efficiency occurs at 75% of the load, then \(\rm \frac{iron \ loss \ at\ full \ load }{copper \ loss \ at\ full \ load}=?\)
In a single-phase transformer, the ratio of transformation is 2 and the secondary resistance is 0.24 Ω. Find the resistance of secondary in terms of primary.
The full load copper loss and iron loss of a transformer are 6400 W and 5000 W respectively the copper loss and iron loss at half load will be respectively.
- Which of the following losses remains variable during normal operation of transformer?
What is the condition at which a transformer gives maximum efficiency?
