A 132 kV circuit breaker interrupts the fault current flowing into a symmetrical three-phase to each fault at current zero. The fault infeed is 2500 MVA, and the shunt capacitance C on the source side is 0.03 µF, The system frequency is 50 Hz. (1) Calculate the maximum voltage across the circuit breaker and the restriking-voltage frequency. (2) If the fault current is prematurely chopped at 500 A, estimate the maximum voltage across the circuit breaker on the first current chop. (3) Derive and plot the transient recovery voltage for different scenarios above.

A 132 kV circuit breaker interrupts the fault current flowing into a symmetrical three-phase to each fault at current zero. The fault infeed is 2500 MVA, and the shunt capacitance C on the source side is 0.03 µF, The system frequency is 50 Hz. (1) Calculate the maximum voltage across the circuit breaker and the restriking-voltage frequency. (2) If the fault current is prematurely chopped at 500 A, estimate the maximum voltage across the circuit breaker on the first current chop. (3) Derive and plot the transient recovery voltage for different scenarios above.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter7: Symmetrical Faults

Section: Chapter Questions

Problem 7.2MCQ: Even though the fault current is not symmetrical and not strictly periodic, the rms asymmetrical...

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