If transformer frequency is changed from 50 Hz to 60 Hz the ratio of eddy current loss at 50 Hz to 60 Hz
If transformer frequency is changed from 50 Hz to 60 Hz the ratio of eddy current loss 50 Hz to 60 Hz, at constant voltage will be
Right Answer is:
1
SOLUTION
Eddy current loss in the transformer is given by:
Pe = Ke Bm2. t2. f2. V Watts
Where;
K – coefficient of eddy current. Its value depends upon the nature of magnetic material
Bm – Maximum value of flux density in Wb/m2
t – Thickness of lamination in meters
f – Frequency of reversal of the magnetic field in Hz
V – Volume of magnetic material in m3
Also
Bm = V/F
Therefore
${P_e}\; = {K_e}\;{\frac{V}{{{F^2}}}^2}{t^2}{f^2}V$
Pe = Ke.V2. t2. V Watts
For constant Voltage
Pe ∝ Constant
So
$\dfrac{{{P_e}_1\;}}{{{P_{e2}}}} = 1$