Zara frowned. “Should be isn’t a calculation. We need to know the prospective short-circuit current at the motor terminals.”
“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.”
“If you open that valve fully, the water rushing out has force . That force is your short-circuit current. But here’s the trick: the narrower the pipe, the lower the force. The wider the pipe, the more destructive the rush.”
“Exactly,” said Leo. “That breaker isn’t a protection device anymore. It’s a bomb. When that 72 kA fault occurs, the breaker will try to open, but the arc inside will be so violent it will vaporize the contacts, explode the casing, and turn the panel into a fireball. You won’t have a ‘short circuit.’ You’ll have a ‘long explosion.’”
Zara pulled out her laptop and ran a proper short-circuit study per IEC 60909.
Short Ckt Current Calculation ^new^ ⚡
Zara frowned. “Should be isn’t a calculation. We need to know the prospective short-circuit current at the motor terminals.”
“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.” short ckt current calculation
“If you open that valve fully, the water rushing out has force . That force is your short-circuit current. But here’s the trick: the narrower the pipe, the lower the force. The wider the pipe, the more destructive the rush.” Zara frowned
“Exactly,” said Leo. “That breaker isn’t a protection device anymore. It’s a bomb. When that 72 kA fault occurs, the breaker will try to open, but the arc inside will be so violent it will vaporize the contacts, explode the casing, and turn the panel into a fireball. You won’t have a ‘short circuit.’ You’ll have a ‘long explosion.’” “The breaker we have in stock is rated for 25 kA
Zara pulled out her laptop and ran a proper short-circuit study per IEC 60909.