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A power system has a circuit breaker connecting a large system, (initially open) to other system between bus 2 and bus 3. The system B three-phase fault level at bus 3 under this condition is unknown. After closing circuit breaker, the 3−ϕ fault level at bus 1 was found to be 6 pu. The new 3−ϕ fault level at system bus 3 after interconnection will be _______ pu. (Assume prefault voltages to be 1 pu at all buses). 7.71 |
Answer» A power system has a circuit breaker connecting a large system, (initially open) to other system between bus 2 and bus 3. The system B three-phase fault level at bus 3 under this condition is unknown. After closing circuit breaker, the 3−ϕ fault level at bus 1 was found to be 6 pu. The new 3−ϕ fault level at system bus 3 after interconnection will be _______ pu. (Assume prefault voltages to be 1 pu at all buses). 
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