NERC Protection and Control Systems Flashcards
6 cards from real NERC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 NERC Protection and Control Systems flashcards as text
What is a 'misoperation' in the context of NERC protection system standards?
Answer: Any unintended operation or failure to operate of a protection system
A misoperation is any protection system operation or failure to operate that does not match the intended design, including false trips or failure to trip during a fault.
Under NERC PRC-004, what must entities do when a protection system misoperation is identified?
Answer: Analyze the misoperation, identify the cause, and implement corrective actions
PRC-004 requires entities to analyze each misoperation within 120 days, determine the cause, and implement corrective actions to prevent recurrence.
Which NERC standard requires generator owners to verify that generator protection systems coordinate with system protection?
Answer: PRC-024
PRC-024 requires generator owners to ensure that generator protective relay settings allow generators to remain online during specified voltage and frequency excursions.
What is the primary concern addressed by NERC standard PRC-025?
Answer: Load-responsive generator and motor protection relay settings to prevent unnecessary tripping
PRC-025 requires that generator and motor protection relays be set so they do not operate in response to load changes that do not represent a fault condition.
How does NERC define the 'Protection System' for purposes of PRC-005?
Answer: Protective relays, communications, voltage and current sensing devices, DC supply, and the control circuitry
NERC's definition of Protection System includes relays, communications, sensing devices, DC supply (batteries and chargers), and all associated control circuitry.
Under NERC standards, what is the significance of the 'N-1 contingency' in protection system design?
Answer: The system must tolerate loss of any single transmission element
N-1 contingency means the bulk electric system must remain stable and within thermal, voltage, and stability limits following the loss of any single transmission element.