NERC NERC Protection and Control Systems 2

Question 1

What is a 'misoperation' in the context of NERC protection system standards?

Accepted Answer

Any unintended operation or failure to operate of a protection system

Answer

A relay that operates correctly to clear a fault

Answer

A manual trip of a breaker by an operator

Answer

A scheduled maintenance outage of a relay

Question 2

Under NERC PRC-004, what must entities do when a protection system misoperation is identified?

Accepted Answer

Analyze the misoperation, identify the cause, and implement corrective actions

Answer

Immediately deactivate the relay until corrected

Answer

Report the misoperation to FERC within 24 hours

Answer

Notify all neighboring transmission operators

Question 3

Which NERC standard requires generator owners to verify that generator protection systems coordinate with system protection?

Accepted Answer

PRC-024

Answer

PRC-019

Answer

PRC-025

Answer

PRC-027

Question 4

What is the primary concern addressed by NERC standard PRC-025?

Accepted Answer

Load-responsive generator and motor protection relay settings to prevent unnecessary tripping

Answer

Transformer differential protection settings

Answer

Sub-synchronous resonance protection

Answer

Automatic transfer scheme coordination

Question 5

How does NERC define the 'Protection System' for purposes of PRC-005?

Accepted Answer

Protective relays, communications, voltage and current sensing devices, DC supply, and the control circuitry

Answer

Only the protective relay itself

Answer

The circuit breaker and associated disconnect switches only

Answer

The SCADA system used to monitor relay status

Question 6

Under NERC standards, what is the significance of the 'N-1 contingency' in protection system design?

Accepted Answer

The system must tolerate loss of any single transmission element

Answer

The system must remain stable after any single protection system component fails

Answer

The system must clear any single fault within 6 cycles

Answer

The system must have N minus 1 spare relays in inventory