Hysteresis loss and eddy current loss are the components of the iron losses. For the applied fl ux density Bmax to the core, we have
Hysteresis loss = Af
and Eddy current loss = Bf2
The no load loss can be expressed as
Wc=Af+Bf2 (1.36)
where A and B are constants.
Therefore,
Figure 1.38 shows the graph, which is a straight line when
The experimental circuit arrangement for determining
In Figure 1.39, a variable frequency alternator supplies to the transformer under the test, which is driven by DC shunt motor whose speed can be varied over a wide range. The switches S1 and S2 are opened and the alternator is started with the help of the DC shunt motor. The speed is adjusted to the
Figure 1.38 Plot of
Figure 1.39 Experimental Circuit for Determining
E2=4.44ΦmfN
i.e.
For constant
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