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Z-Bus Building Algorithm

Consider the ...

Question

Consider the network shown in the figure. The bus numbers and impedances are marked. A $3 - ϕ$ short circuit fault occurs at bus 2. The subtransient current of the fault in per unit is ___.

0.33

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Solution

The correct option is A 0.33
$Z_{b u s} = ⎡ ⎢ ⎣ \begin{matrix} 2.0 & 0 & 0 0 & 3.0 & 3.0 0 & 3.0 & 7.0 \end{matrix} ⎤ ⎥ ⎦$

A 3 $ϕ$ fault on bus 2, $I_{f} = \frac{1.0}{Z_{22}}$

$= \frac{1.0}{3.0}$

= 0.33 p.u

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