Question: A three-phase circuit breaker has a (15.5-mathrm{kV}) rated maximum voltage, (9.0-mathrm{kA}) rated short-circuit current, and a 2.50-rated voltage range factor. (a) Determine the symmetrical interrupting

A three-phase circuit breaker has a $15.5-\mathrm{kV}$ rated maximum voltage, $9.0-\mathrm{kA}$ rated short-circuit current, and a 2.50-rated voltage range factor.

(a) Determine the symmetrical interrupting capability at $10-\mathrm{kV}$ and $5-\mathrm{kV}$ operating voltages.

(b) Can this breaker be safely installed at a threephase bus where the symmetrical fault current is $10 \mathrm{kA}$, the operating voltage is $13.8 \mathrm{kV}$, and the $(\mathrm{X} / \mathrm{R})$ ratio is 12 ?

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