NERC RC Exam UPDATED Exam Questions and CORRECT Answers

NERC RC Exam UPDATED Exam
Questions and CORRECT Answers
What is ACE? - CORRECT ANSWER -(NIa - NIs) - 10β(fa - fs) - Ime
Calculated every 6 seconds
Uses Tie line Frequency Bias


What is Tie line deviation? - CORRECT ANSWER -Largest offset to ACE



What is NIA? - CORRECT ANSWER -Net Interchange Actual (sum of all tie-line values)



What is NIS? - CORRECT ANSWER -Net Interchange Scheduled (sum of all interchange
schedules)


What is the multiplier for frequency bias? - CORRECT ANSWER -10



What is β? - CORRECT ANSWER -Frequency bias - represented as negative number in
ACE calculation - reflects area natural response to frequency changes (Inertia, Governor, Load) -
atleast 1% of annual peak load for areas with native load - 1% of peak generation output for area
with no load


What is FA? - CORRECT ANSWER -Frequency Actual



What is FS? - CORRECT ANSWER -Frequency Schedule - normally 60.00 HZ except for
time corrections - +/- .02 Hz


What is IME? - CORRECT ANSWER -Meter error
fudge factor
used for inadvertent bilateral payback

,Negligible


What should be done if unable to calculate ACE for 30 minutes? - CORRECT ANSWER -
Contact RC


How often should time error and frequency devices be checked/calibrated? - CORRECT
ANSWER -Annually



Negative Ace - CORRECT ANSWER -The BA is Undergenerating



Positve ACE - CORRECT ANSWER -The BA is Overgenerating



What happens during Internal Loss of Load? - CORRECT ANSWER -Frequency and
ACE increase.


What happens during External Loss of Load? - CORRECT ANSWER -Frequency
increases, no change in ACE.


What is the Frequency Bias Setting? - CORRECT ANSWER -Monthly average >= 1% of
estimated yearly peak demand per 0.1 Hz


When should the Balancing Authority recalculate its Frequency Bias Setting? - CORRECT
ANSWER -By January 1 of each year



What happens when there is internal generation loss? - CORRECT ANSWER -Frequency
and ACE drop, tie-line flows increase into the system


What happens when there is external generation loss? - CORRECT ANSWER -Frequency
drops, no change in ACE, net tie-line flows increase out of the system

, What happens when Frequency bias setting is lower than frequency response? - CORRECT
ANSWER -ACE will be positive causing the AGC to lower generation


What is the percentage change in load required for a 1% change in frequency? - CORRECT
ANSWER -1% - 2% change in load


What is the load reduction when Transmission Customer Voltage is reduced by 5%? -
CORRECT ANSWER -Load will reduce by 3%


What happens to ACE and AGC when the frequency bias setting is set to a less negative value
than the frequency response of a Balancing Authority and a frequency increase is caused by a
sudden loss of load in an external balancing area? - CORRECT ANSWER -ACE will be a
negative value and AGC will increase generation


What happens to ACE and AGC when the frequency bias setting is less negative than the
frequency response of a Balancing Authority and a frequency decline is caused by a sudden loss
of generation in an external balancing area? - CORRECT ANSWER -ACE will be a
positive value and AGC will lower generation


What is the normal schedule frequency? - CORRECT ANSWER -60.00 Hz



What is the frequency correction for fast clock schedule? - CORRECT ANSWER -59.98
Hz


What is the frequency corrections for a slow clock schedule? - CORRECT ANSWER -
60.02 Hz


When does frequency increase? - CORRECT ANSWER -Generation increases or load
decreases


When does frequency decrease? - CORRECT ANSWER -Generation decreases or load
increases