Question $2[20]$

A $30$kVA,$\frac{4000}{400}-V,50Hz,$ single phase transformer has the following parameters: $HV$:$R=4,x_{-}L=6$

$LV$:$R=0\mathrm{.}05,xL=0\mathrm{.}06,RC=15k,x_{-}M=800$

The power factor is $0\mathrm{.}8$ lagging Use actual values and determine:

$2\mathrm{.}1$ The secondary terminal voitage

$(10)$

$2\mathrm{.}2$ The voltage regulation $q,$

$[2]$

$2\mathrm{.}3$ Now use per unit system and determine:

$2\mathrm{.}3\mathrm{.}1$ The secondary terminal voltage $q,$

$[6]$

$2\mathrm{.}3\mathrm{.}2$ The voltage regulation $q,(2)$