220 Introduction to Electrical Power and Power Electronics
3. By hydraulic analogy, explain how the rst peak of the transient fault cur-
rent gets much greater than the symmetrical peak.
4. Explain the R-L-C circuit physics leading to the asymmetrical fault current
peak almost twice in the worst case than the symmetrical peak.
5. Explain the terms d-axis and q-axis in the synchronous generator and
motor.
6. Explain the subtransient and transient reactance of the synchronous
generator.
7. Between the two rough estimates of fault current as per the IEEE standard,
which multiplier with the generator rated current, 8.5 or 10, should you use
in the structural design of the bus bars and all electrical machines involved
in series with the fault ...