The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be
The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be
Right Answer is:
115 V
SOLUTION
To maintain the magnetizing current of the transformer at the same level the ratio of voltage to frequency must be the same. i.e
Given
F1 = 50 Hz
F2 = 25 Hz
V1 = 230 V
V2 = ?
$\frac{V}{F} = Constant$
$\begin{array}{l} \frac{{{V_2}}}{{{F_2}}} = \frac{{{V_1}}}{{{F_1}}} = Constant\\ \\ {V_2} = 230 \times \frac{{25}}{{50}} \end{array}$
V2 = 115 V