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NERC System Operator Exam Preparation Questions and Answers
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NERC System Operator Exam Preparation
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NERC System Operator ExamPreparation
Power equation – answer P=IV; power (watts)=current (amps) x voltage (volts)
Power equation three phase - answer Power=Voltage (v) x Current (I) x 1.73 x Power
Factor (PF)
If operating reserve gradually decreases throughout the hour, it's because ___. - answer
Incorrect load forecast
Operating reserves are made up of ___ and ___. - answer Regulating Reserves and
Contingency Reserve
What type of reserves are used for AGC? - answer Regulating
A BA's MSSC is usually its ___. - answerLargest Generator
Equation to determine speed in RPM of a Generator? - answer7200/# of poles
At what frequency will a generator trip on underfrequency? - answer57.5 Hz
Why do we have underfrequency tripping? - answerProtect turbines from damage
Why does frequency drop faster/is harder to correct, when we have a disturbance when
we have increased wind generation? - answerLess inertia/governor response to correct
frequency
Frequency above 60 Hz means ___. - answerOvergenerating
Frequency below 60 Hz means ___. - answerUndergenerating
Frequency decrease is usually caused by ___. - answerLoss of generation
A 1% drop in frequency results in ___. - answer2% drop in total load; 3% drop in motor
load
Formula for ACE? - answerNIa-NIs -10B(Fa-Fs)
Governor response is based on its ___ characteristic. - answerDroop
, 5% of 60 Hz= - answer3 Hz; most Governor's have 5% droop characteristic
Droop setting is the % required for a generator to run at ___ capacity. - answerFull
What is the purpose of a governor deadband? - answerMinimize wear on equipment
What % for governor deadband? - answer+/- .036 Hz
An isochrynous generator setting has ___ droop. - answer0%
When are isochryonous generators used? - answerone unit, during islanding
Is 10% droop or 5% droop more responsive? - answer5%
On a classic disturbance chart, what brings frequency from point c to d? -
answerContingency Reserve
On a classic disturbance chart, what causes a 'step' change? - answerFast-start
generator
What's the primary response to frequency drop? - answerGovernor response
Examples of asynchronous generation? - answerSolar, wind
What happens to load with increased behind-the-meter generation? - answerPeaks later
in the day; duck curve
MWs flowing into a BA are - or +? - answerNegative
If you lose a 500 MW generator in your BA, your ACE ___. - answerDecreases by 500
MW
What part of the ACE equation is always negative? - answerFrequency Bias
CPS1 says BA has to be ___ for 12 month period, which is evaluated ___. -
answer≥100%, monthly
BAAL is a long-term measurement of ___. - answerACE
BAAL says Reporting ACE can't exceed the BA's BAAL for more than ___ consecutive
minutes. - answer30
BAL-002 deals with ___ and reportable events. - answerDisturbance Control
Performance
How much Contingency Reserve does a BA have to have? - answer100% of MSSC
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