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NERC Power System Operation Questions and Answers, Exams of Environmental Science

Grand Canyon University (GCU)Environmental Science

A comprehensive set of questions and answers related to nerc (north american electric reliability corporation) power system operations. it covers key concepts such as voltage regulation, reactive power management, frequency control, and contingency planning. The questions delve into various aspects of power system stability, control, and protection, making it a valuable resource for students and professionals in electrical engineering and power systems.

Typology: Exams

2024/2025

Available from 04/22/2025

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NERC RC Questions and Correct
Answers
System studies identify what - Correct Answer: Predict operations and identify constraints
If ACE remains the same and frequency goes up what has happened? - Correct Answer: Someone lost
load
When a generator has its AVR in service it is a? - Correct Answer: Dynamic source of reactive power
Black start resource testing is done every? - Correct Answer: 3 years
Each BA shall operate its AGC on? - Correct Answer: Tie line Frequency Bias
When is voltage reduction reportable? - Correct Answer: Greater than 3%
Reactors do what? - Correct Answer: Absorb VARs
What AGC mode should a generator use when islanded? - Correct Answer: Flat Frequency
Implement back up functionality plan within? - Correct Answer: 2 hours
Who submits the request for interchange for an emergency transaction? - Correct Answer: The sink BA
Transmission lines that are heavily loaded do what? - Correct Answer: Absorb VARs
Undervoltage load shedding is designed to? - Correct Answer: Reduce power flow into an area
A generator will increase output when? - Correct Answer: Frequency decreases
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Download NERC Power System Operation Questions and Answers and more Exams Environmental Science in PDF only on Docsity!

NERC RC Questions and Correct

Answers

System studies identify what - Correct Answer: Predict operations and identify constraints If ACE remains the same and frequency goes up what has happened? - Correct Answer: Someone lost load When a generator has its AVR in service it is a? - Correct Answer: Dynamic source of reactive power Black start resource testing is done every? - Correct Answer: 3 years Each BA shall operate its AGC on? - Correct Answer: Tie line Frequency Bias When is voltage reduction reportable? - Correct Answer: Greater than 3% Reactors do what? - Correct Answer: Absorb VARs What AGC mode should a generator use when islanded? - Correct Answer: Flat Frequency Implement back up functionality plan within? - Correct Answer: 2 hours Who submits the request for interchange for an emergency transaction? - Correct Answer: The sink BA Transmission lines that are heavily loaded do what? - Correct Answer: Absorb VARs Undervoltage load shedding is designed to? - Correct Answer: Reduce power flow into an area A generator will increase output when? - Correct Answer: Frequency decreases

EEA 3 - Correct Answer: Anticipating or implementing firm load interruption What is the relation to frequency and load when islanded? - Correct Answer: To increase frequency 1 Hz you must shed 6-10% of load Zone 2 - Correct Answer: 120-150% of the line. Backup for Zone 1. What resource should be used during high load periods? - Correct Answer: Capacitive Who do you notify about curtailed interchange? - Correct Answer: All BA's on scheduled path. If providing overlap modify your? - Correct Answer: Frequency Bias setting When do you reduce power flows and increase generation? - Correct Answer: During low voltage EEA 2 - Correct Answer: Excluding shedding firm load In what part of the ACE equation is dynamic schedules accounted for? - Correct Answer: NIs Zone 3 - Correct Answer: 130-300% of a line What is reduced when power lines are connected in parallel? - Correct Answer: Impedance If frequency and ACE goes down what has happened? - Correct Answer: You lost load What do capacitors do? - Correct Answer: Increase VARs Primary cause of low voltage - Correct Answer: VAR losses

B. Motor type load C. Nominal load D. Non-motor type load - Correct Answer: D P-V curves indicate the __________ margin from voltage instability while V-Q curves indicate the __________ margin from voltage instability. A. Mvar / MW B. MW/ Mvar C. MW / current D. Power / Mvar - Correct Answer: B. MW/ Mvar UVLS differs from UFLS in that: A. The tripping frequencies are different B. The tap changing points are different C. UVLS is based on voltage while UFLS is based on frequency D. UVLS is based on frequency while UFLS is based on voltage - Correct Answer: C. UVLS is based on voltage while UFLS is based on frequency Power flow - Correct Answer: Transfer of power either MW or MVAR over transmission or distribution line. Operating Reserves - Correct Answer: Capability above firm system demand required for regulation and forced equipment outages. Reactive Reserves - Correct Answer: Amount of MVAR or reactive power that can be instantaneously accessed in the power system. SOL - Correct Answer: Satisfaction of the most limiting operating criteria. When impedance is increased so is? - Correct Answer: Reactive power usage. MVAR

When voltage levels need to be increased the solution is to? - Correct Answer: Introduce Reactive Resources. MW and MVAR follow the path of? - Correct Answer: Least Impedance How does a Generator increase its voltage? - Correct Answer: Increasing DC excitation current What happens when you increase DC excitation current - Correct Answer: You increase internal voltage, which leads to more MVAR flowing out of the generator Transmission lines provide what during light loading? - Correct Answer: MVAR Transmission lines absorb what during heavy loading? - Correct Answer: Reactive power What is a loss of synchronisim? - Correct Answer: Magnetic bond is weak What are the three power flow/power transfer limits? - Correct Answer: Thermal, stability, voltage Thermal limits are the result of what? - Correct Answer: Thermal capability

  • Correct Answer: When a generator is supplying reactive power to the system, the generator mode of operation is referred to as lagging, boosting, pushing or overexcited. When a generator is absorbing reactive power from the system, the generator mode of operation is referred to as leading, bucking, pulling or underexcited. The capacitive effect of a transmission line is dependent on system - Correct Answer: Frequency The greater the frequency the more _____ a line naturally produces - Correct Answer: Mvar