Chapter 7: Q19MCQ (page 464)
For distribution systems, standard reclosers are equipped for two or more reclosers, whereas multiple-shot reclosing in EHV systems is not a standard practice.
(a) True (b) False
The correct answer is (a) true.
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For the power system given in Problem 7.14, a three-phase short circuit occurs at bus 4, where the prefault voltage is. Prefault load current is neglected. Determine (a) the Thévenin equivalent at the fault, (b) the subtransient fault current in per unit and in, and (c) contributions to the fault from transformer and from line 3–4.
A typical fusible link metal in fuses is _____, and a typical filler material is _____.
Generally, in power-system short-circuit studies, for calculating sub-transient fault currents, transformers are represented by their _____, transmission lines by their equivalent _____, and synchronous machines by _____ behind their sub-transient reactances.
Which type of WTG can produce the largest three-phase short-circuit current?
A single-line diagram of a four-bus system is shown in Figure 7.20, for whichis given below:
Let a three-phase fault occur at bus 2 of the network.
(a) Calculate the initial symmetrical rms current in the fault.
(b) Determine the voltages during the fault at buses 1, 3, and 4.
(c) Compute the fault currents contributed to bus 2 by the adjacent unfaulted buses 1, 3, and 4.
(d) Find the current flow in the line from bus 3 to bus 1. Assume the prefault voltage at bus 2 to belocalid="1655403112082" and neglect all prefault currents.
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