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For the configuration shown in figure the breaker connecting a large system to bus 2 is initially open. The system 3-phase fault level at bus 3 under this condition is not known. After closing the system breaker, the 3-phase fault level at bus 1 was found to be 5.0 p.u. What will be the new 3-phase fault level at system bus 3 after the interconnection? All per unit values are on common base. Prefault load currents are neglected and prefault voltage are assumed to be 1.0 p.u. at all buses.Eg = 1.0 p.u., XT = 0.2 p.u., XLine = 0.3 p.u., Xd = 0.2 p.u. 11.4285 |
Answer» For the configuration shown in figure the breaker connecting a large system to bus 2 is initially open. The system 3-phase fault level at bus 3 under this condition is not known. After closing the system breaker, the 3-phase fault level at bus 1 was found to be 5.0 p.u. What will be the new 3-phase fault level at system bus 3 after the interconnection? All per unit values are on common base. Prefault load currents are neglected and prefault voltage are assumed to be 1.0 p.u. at all buses. Eg = 1.0 p.u., XT = 0.2 p.u., XLine = 0.3 p.u., Xd = 0.2 p.u.
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