Chapter 7: Q14MCQ (page 464)
A circuit breaker is designed to extinguish the arc by _____.
A circuit breaker is designed to extinguish the arc by Elongating and cooling it.
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A 345-kV, three-phase transmission line has a 2.2-kA continuous current rating and a 2.5-kA maximum short-time overload rating with a 356-kV maximum operating voltage. The maximum symmetrical fault current on the line is 30 kA. Select a circuit breaker for this line from Table 7.10.
Power-circuit breakers are intended for service in the ac circuit above _____ V.
Which type of WTG can produce the largest three-phase short-circuit current?
Repeat Example 7.1 with ,, and
Equipment ratings for the four-bus power system shown in Figure 7.14 are as follows:
Generator G1:
Generator G2:
Generator G3:
Transformer T1:
Transformer T2:
Transformer T3:
Each 500 kV line:.
A three-phase short circuit occurs at bus 1, where the prefault voltage is 525 kV . Prefault load current is neglected. Draw the positive-sequence reactance diagram in per unit on a , base in the zone of generatorG3. Determine (a) the Thรฉvenin reactance in per unit at the fault, (b) the subtransient fault current in per unit and in kA rms , and (c) contributions to the fault current from generator GI and from line .
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