North American Electric Reliability Corporation (NERC) Tests Bundle Set

A misoperation occurred when an overhead ground wire on a 230KV transmission line between two substations broke and fell across A phase of the line. One of the line circuit breakers failed to open causing the breaker failure relay to pick up and as a result tripped the entire substation bus off line...

Two phase conductors of a 138kV transmission line come in contact due to a storm, creating a phase to phase fault. The distance relay at each end of the line tripped and isolated the line. What two measured parameters of the line caused the distance relay to operate? Temperature and length MWs ...

In order for a generator to qualify as regulating reserve it must have which of the following characteristics ? Generator must be ronized , and its governor blocked Generator must be off - line and available in 10 minutes Generator must be synchronized , and its governor not blocked ...

If a Balancing Authority does not comply with the Control Performance Standard, the Balancing Authority is not permitted to provide which of the following for any other Balancing Authority entities? CORRECT ANSWER Regulation of other services related to control performance 1. It is the obligation...

System Frequency Rule of Thumb CORRECT ANSWER 1% change in frequency leads to 2% change in MW load Each BA shall operate resources to provide for a level of operating reserve sufficient to account for? CORRECT ANSWER Frequency Support Errors in load forecasting generation loss transmission una...

Q32618 When a high voltage transmission line circuit breaker trips open as a result of a fault, a synchronous check relay will monitor certain values on both the line side and the bus side of the open circuit breaker. Before the synchronous check relay re-closes the open circuit breaker, which of th...

What is the purpose of IRO-002? CORRECT ANSWER RCs must have the authority, plan & agreements in place to immediately direct reliability entities within their areas to redispatch generation, reconfigure transmission or reduce load to mitigate critical conditions to return the system to a reliable st...

What entity balances generation and monitors/employs contingency reserves? CORRECT ANSWER Balancing Authority (BA) What entity has the widest system view and is the "supervisor"? CORRECT ANSWER Reliability coordinator (RC) What entity monitors transmission lines and operates tap-changers, br...

3 phase power equation CORRECT ANSWER √3 x V x I x Power factor Total power equation CORRECT ANSWER S = √3 x V x I Generator rpm equation CORRECT ANSWER N = 120xF/P Droop Equation CORRECT ANSWER Generator Capacity/Droop setting = Response/Change in frequency (Hz) 1% drop in what is 2...

b. Perform power flow study in preparation of opening Line 1 CORRECT ANSWER Your system is experiencing heavy loading and low voltage . What is the first response for a System Operator ? a) Take lines out of service b) Put capacitors in service c) Put reactors in service d) Lower loads COR...

What percentage of load gives a 1 Hz change in an island condition? CORRECT ANSWER 6-10% (Think 6-10 day island vacation) If ACE is Zero but system Hz is off, what should a system operator do? CORRECT ANSWER Nothing! ACE bias and interchange schedule will improve frequency If ACE is Zero, why ...

NERC RC BAL-005 questions with correct answers

What are three primary AGC control models? CORRECT ANSWER-Tie-Line Bias, Constant Frequency, Constant Net Interchange When a balancing Authority's ACE is zero, what is true? CORRECT ANSWER-The BA load-interchange-generation balancing while supporting Interconnection Frequency In a 3-phase AC ...

Area Control Error (ACE) CORRECT ANSWER-The instantaneous difference between a Balancing Authority's net actual and scheduled interchange, taking into account the effects of Frequency Bias, correction for meter error, and Automatic Time Error Correction (ATEC), if operating in the ATEC mode. ATEC i...

c. authority CORRECT ANSWER-1. A Reliability Coordinator must have the _________ to immediately direct reliable entities within their Reliability Coordinator Areas to re-dispatch generation, reconfigure transmission, or reduce load to mitigate critical conditions to return the system to a reliable s...