A three-phase circuit breaker has a (15.5-mathrm{kV}) rated maximum voltage, (9.0-mathrm{kA}) rated short-circuit current, and a 2.67-rated
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 2.67-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 three-phase 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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a To determine the symmetrical interrupting capability at 10kV and 5kV operating voltages we can use ...View the full answer
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