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NERC Practice Set 3: Transmission Line and System Operation Questions and Answers, Exams of Advanced Education

Liberty University (LU)Advanced Education

A set of multiple-choice questions and answers related to nerc (north american electric reliability corporation) standards and practices for transmission line and system operation. It covers topics such as power flow studies, reactive power management, contingency analysis, and emergency response procedures. The questions are designed to test understanding of key concepts and principles relevant to ensuring reliable and safe operation of electric power systems.

Typology: Exams

2024/2025

Available from 03/11/2025

EXAMDOC
EXAMDOC 🇺🇸

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NERC Practice Set 3 questions with correct answers
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 CORRECT ANSWER b) Put capacitors in service
Which of the following action is appropriate for mitigating heavy power transfer
on a transmission line ?
a) Put parallel line in service
b) Put a capacitor in service
c) Put a reactor in service
d) Increase generation CORRECT ANSWER a) Put parallel line in service
Line A is a 100 mile 500kV transmission line. Line B is a 10 mile 500 kV
transmission line. Both lines are lightly loaded. Line B is contributing 3.2MVAR
to the bus. How much MVAR will line A contribute to the bus ?
a) 10 times 3.2 MVAR
b) Less than 3.2 MVAR
c) Equal to 3.2 MVAR
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NERC Practice Set 3 questions with correct answers

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 CORRECT ANSWER b) Put capacitors in service Which of the following action is appropriate for mitigating heavy power transfer on a transmission line? a) Put parallel line in service b) Put a capacitor in service c) Put a reactor in service d) Increase generation CORRECT ANSWER a) Put parallel line in service Line A is a 100 mile 500kV transmission line. Line B is a 10 mile 500 kV transmission line. Both lines are lightly loaded. Line B is contributing 3.2MVAR to the bus. How much MVAR will line A contribute to the bus? a) 10 times 3.2 MVAR b) Less than 3.2 MVAR c) Equal to 3.2 MVAR

d) More than 3.2 MVAR CORRECT ANSWER d) More than 3.2 MVAR What are the effects of transmission line loading above its surge impedance loading? a) The line acts like a capacitor b) The line acts like a reactor c) The line ceases to function d) The line's losses decrease CORRECT ANSWER b) The line acts like a reactor After a forced outage , a contingency analysis study shows that one more outage will cause an IROL violation. There is a parallel line out for maintenance that can be returned within a 4 hours window if requested. What must be done first to mitigate this condition? a) Put the parallel line in service with protection b) Put the parallel line in service without protection c) Take the protective tripping off the line d) Call the RC and formulate an Operating Plan CORRECT ANSWER d) Call the RC and formulate an Operating Plan A transformer rated at 100 MVA has 80 MW flowing through it. How many MVARS could flow through it without exceeding its rating? a) 80 MVAR b) 60 MVAR c) 50 MVAR

b) Interconnection frequency will likely increase c) Interconnection frequency will likely decrease d) The island will have its own frequency CORRECT ANSWER b) Interconnection frequency will likely increase

  1. Which transmission line type will likely produce more reactive power? a) Underground cable b) Lightly loaded short overhead line c) Loaded tie - line d) Radial Lines with capacitor banks in service CORRECT ANSWER a) Underground cable Power is flowing from source BA 1 to sink BA 2 and loading the tie-lines. Which action would reduce the power flow on the tie-lines? a) Reliability Coordinator declare an EEA b) Increasing generation in the sink BA c) Increasing generation in the source BA d) Buy more power from source BA CORRECT ANSWER b) Increasing generation in the sink BA An Emergency outage request would result in exceeding an SOL? Which actions need to be considered prior to taking the outage? a) Will it exceed SOL study b) Redispatch generation or reconfigure transmission

c) Shed Load to allow outage d) Open the line that will exceed SOL CORRECT ANSWER b) Redispatch generation or reconfigure transmission A local transmission line trips after making contact with a tree. At one terminal SCADA shows every breaker on the bus standing open. What likely caused this result? a) Differential relay b) Ground relay c) SPS / RAS d) Breaker Failure relay CORRECT ANSWER d) Breaker Failure relay

  1. A line has 200 ohm of capacitive reactance and 600 ohm of inductive reactance, what is the total reactance of the line? a) 200 ohms b) 400 ohms c) 600 ohms d) 800 ohms CORRECT ANSWER b) 400 ohms When you need to increase MVARS due to inductive reactive power demands, which equipment would you primarily use? a) Generators kV setpoint b) Capacitor Banks c) Shunt Reactor

If a Transmission Operator loses the ability to run a contingency analysis and reports it to its RC, what should the RC do? a) The RC should run RTCA for the TOP area b) Inform TOP it is in violation of NERC Standard c) Continue to perform Contingency Analysis for the entire RC area and report to the TOP issues in its area d) Issue an Operating Instruction to fix Contingency Analysis CORRECT ANSWER c) Continue to perform Contingency Analysis for the entire RC area and report to the TOP issues in its area b. To increase the impedance of a line CORRECT ANSWER Which type of power cannot travel far and should be deployed close to inductive loads a) Real power b) Reactive power c) Total power d) Horsepower CORRECT ANSWER b) Reactive power What are the two measured parameters of a transmission line that will caused a distance relay to operate? a) Power and Voltage b) Voltage and Current c) Resistance and Losses

d) Current In and Current Out CORRECT ANSWER b) Voltage and Current Real-time contingency analysis show that a transmission line will overload for the loss of Line X. The loss of Line X will also result in the overloaded line being radial. What is the best course of action for the Transmission Operator? a) Open the line b) Redispatch generation c) Shed load immediately d) Be prepared to shed load if Line X trips CORRECT ANSWER d) Be prepared to shed load if Line X trips How much contingency reserve does a BA have to carry if its total generation is 4500MW comprised of three 500 MW unit and three 1000 MW units a) 450 MW b) 500 MW c) 750 MW d) 1000 MW CORRECT ANSWER d) 1000 MW