Question

In the circuit shown below:



$L_s$ is $5$% with the rated voltage of $230V$ at $60Hz$ and the rated volt amperes of $5kVA$. The value of source inductance is _____ $mH$.

Answer 1

The rated current is $I_{rated}=\frac{5000}{230}=21.74A$

The base impedance is, $Z_{base}=\frac{V_{rated}}{I_{ratd}}=\frac{230}{2.74}=1058\Omega$

$L_s=\frac{Z_{base}\times 0.05}{\omega }$

$=\frac{10.58\times 0.05}{2\pi \times 60}=1.40mH$