Question

5.3 A 13.8 kV, three-phase bus is supplied from a solidly grounded system with an effective reactance of 0.4. A 5.4 MVA capacitor bank is connected to the bus. During switching operation to disconnect the capacitor from the bus, the switch reignites, the reignition occurring when the voltage across the switch is 18 kV. What wil be the peak value of the reignition current? What voltage will be left trapped on the capacitor if this reignition current is interrupted? PROBLEMS 123 a. At its first current zero? b. At its second current zero? If following (a), a second reignition occurs exactly half a cycle after the first, what would then be the peak transient voltage appearing on the capacitor?

Answer 1

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