Free sample: 2 of 45
Answer each one before you open the explanation. On the exam there's no explanation, and you have about 77 seconds a question on RC and BT, 90 on TO and BI.
Which entity develops, implements and maintains the outage coordination process used for generation and Transmission outages in an area?
- A. The Reliability Coordinator
- B. The Transmission Operator
- C. The Balancing Authority
- D. The Transmission Owner
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Answer A The Reliability Coordinator
IRO-017-1 R1 places the outage coordination process on the Reliability Coordinator, including submission timing, evaluation of outage impacts across its Wide Area and resolution of outage conflicts. R2 then requires each Transmission Operator and Balancing Authority to perform the functions that process assigns to it.
Reference: IRO-017-1 R1 and R2
Closing a normally open 138 kV tie breaker will parallel two systems that have been running separately. What must the operator verify at the open breaker before closing it?
- A. Load current on both sides of the breaker is below the Normal Rating
- B. Voltage magnitude, phase angle and frequency match across the breaker
- C. Reactive Power flow on each side of the breaker is close to zero
- D. Relay targets at both stations have been reset since the last trip
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Answer B Voltage magnitude, phase angle and frequency match across the breaker
Closing the tie brings two separately running systems into synchronism, so the check across the open point is that voltage magnitude, phase angle and frequency are within the closing limits. A large angle or voltage difference produces a power surge through the breaker and shocks connected machines.
Reference: Power system fundamentals; control-room operating practice
