1What is the magnetizing current of a power transformer Expl

1-What is the magnetizing current of a power transformer? Explain briefly.

2-What is the difference between copper losses and iron losses in a power transformer?

3-What is the relationship between the power losses and the load current of a power transformer? Explain briefly.

4-Are power transformers ideal devices, i.e., is their efficiency equal to 100%? Explain briefly.

5-Explain what the voltage regulation down of a power transformer is.

I Would rather the answer to be by typing from computer better then the handwriting.

Thanks.

Solution

1 Ans) Magnetising current is current required to build up flux in the core of a power transformer ,It is directly proprotional to the Magnetic field intensity H which is x-axis of BH curve

2 Ans) Copper is I^2 R loss i.e it is the loss due to winding resistance which dissipates in the form of heat

whereas core loss(Iron loss) is the loss due to eddy currents and hysterisis loss in the core   which occurs in the core due that core gets heated up an dissipates heat to the surroundings

3 Ans)Power loss is proportional to square of load current as it is mainly copper loss which is varying due to load current i.e I^2 R loss (copper loss)

4Ans) Power transformers are not ideal as it needs core to wound the winding and need copper which has finite resistance ,all these elements corresponds to copper loss and core loss as dicussed above ,as losses are present efficiency can never be 100%

5 ans) regulation is change in voltage from no load to full load with respect to no load is regulation down of a transformer

only 1 question per post will be answered but I answered all here