Chapter 7: Q3CSQ (page 472)
For which type of WTG can the short-circuit current be controlled? Why?
Thecurrent is controlled by the PWM converter in the type 4 generator
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Equipment ratings for the five-bus power system shown in Figure 7.15 are as follows:
Generator G1:
Generator G2:
Transformer T1:
Transformer T2:
Each line: localid="1655450324555"
A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV . Prefault load current is neglected. (a) Draw the positive-sequence reactance diagram in per unit on a , base in the zone of generatorG2. Determine (b) the Thรฉvenin equivalent at the fault, (c) the subtransient fault current in per unit and inkA rms , and (d) contributions to the fault from generator G2 and from transformer T2 .
The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going through the stages of _____ and _____ periods.
For Problem 7.6, determine (a) the instantaneous symmetrical fault current in kA in phase a of the generator as a function of time, assuming maximum dc offset occurs in this generator phase, and (b) the maximum dc offset current in kA as a function of time that can occur in any one generator phase.
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
Before proceeding with per-unit fault current calculations, based on the single-line diagram of the power system, a positive-sequence equivalent circuit is set up on a chosen base system.
(a) True
(b) False
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