BEE Bachelor of Electrical Engineering Power Systems Engineering Questions and Answers Flashcards
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Read the first 6 BEE Bachelor of Electrical Engineering Power Systems Engineering Questions and Answers flashcards as text
A 345 kV transmission line has a surge impedance of 400 ohms. What is the surge impedance loading (SIL) of the line?
Answer: 297.6 MW
SIL equals V² divided by the surge impedance, so (345,000)² / 400 = 297.6 MW.
In a power system, what is the primary purpose of a bus coupler breaker?
Answer: To transfer load between two bus sections without interruption
A bus coupler breaker connects two bus sections and allows load transfer between them without service interruption.
Which type of fault in a three-phase power system typically produces the highest fault current?
Answer: Three-phase bolted fault
A three-phase bolted fault produces the highest symmetrical fault current because it has the lowest impedance path.
What does the equal area criterion determine in power system transient stability analysis?
Answer: Whether a synchronous machine will remain in synchronism after a disturbance
The equal area criterion compares accelerating and decelerating energy areas on the power-angle curve to determine if a generator maintains synchronism.
A generator has a transient reactance of 0.25 per unit and delivers 1.0 per unit power at unity power factor. What is the internal voltage behind transient reactance?
Answer: 1.03 per unit
The internal voltage is calculated as √(Vt² + (Xd'·I)²) = √(1² + 0.25²) ≈ 1.03 per unit at unity power factor.
In economic load dispatch, what condition must be satisfied for optimal generation allocation among multiple units?
Answer: The incremental cost of all participating units must be equal
Optimal economic dispatch requires that all generating units operate at the same incremental fuel cost (lambda).