Short Ckt - Current Calculation __top__

“Your full load current on the low side (400V) is about 3,600 amps. With 5% impedance (0.05 pu), your short-circuit current is 3,600 / 0.05 = (72 kA).” Mike’s face went pale. “But our breaker is only rated for 25 kA.”

Zara frowned. “Should be isn’t a calculation. We need to know the prospective short-circuit current at the motor terminals.” short ckt current calculation

“Just connect it to the main 11 kV bus,” said the project manager. “The breaker we have in stock is rated for 25 kA. That should be plenty.” “Your full load current on the low side