NERC RC EXAM WITH WELL
EXPLAINED STUDY GUIDE
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
EXPLAINED STUDY GUIDE
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
