Question

A 33 kVA, 2200/220 V, 50 Hz single phase transformer has the following parameters primary winding resistance and reactance are 2.4 $\Omega$ and 6 $\Omega$ respectively. Secondary winding resistance and reactance are 0.03 $\Omega$ and 0.07 $\Omega$ respectively, then the ohmic loss at full load is _______W.

• A. 1215

Answer 1

The correct option is A 1215
$\text{Primary full load current,}$

$I_1=\frac{33000}{2200}=15A$

$\therefore \text{Ohmic loss at full load current =}{I}_1^2{r}_{e1}$ $(r_{e1}\text{= equivalent resistance referred to HV side)}$

$r_{e1}=2.4+\left(0.03\right){\left(\frac{2200}{220}\right)}^2=5.4\Omega$

$\text{Full load ohmic loss =}{15}^2\times 5.4$
$=1215Watt$