PJM Transmission Exam
Study/Updated/156 Questions
with Solved Answers/Graded A+
During System Restoration, what is the optimal Frequency Range? - -
59.75 - 61 Hz
-The 500 kV system has normal bus voltages between? - -500 to 550 kV
-When Connecting 2 islands, the operator must match? - -Voltage, Phase
Angle and Frequency
-What are the Minimum Source Requirements for a 500kV line?
(Gen/mile and load/mile) - -30 MW Gen/mile of energized 500 kV and 20
MW Load/mile of energized 500 kV
-When will PJM issue a Minimum Generation Alert? (how many MW under
normal operating limits) - -When expected generation levels fall within
2500 MW of normal operating limits
-When a thunderstorm is nearing the BES should auto-reclosing be
turned on? - -Yes
-What does SCADA stand for? - -Supervisory Control & Data Acquisition
-What does IROL stand for? - -Interconnection Reliability Operating Limit
-What does eDART stand for? - -Dispatcher Application and Reporting
Tool
-What is eDART used for? (Electronic Disp Reporting Tool) - -It is used
for: Generation Outage Scheduling, Instantaneous Reserve Checks,
Generator Reactive Capabilities and to enter and submit switching
-What direction do VARS flow? - -From HIGH Voltage to LOW Voltage
-What direction do MW flow? - -From HIGH Phase Angle to LOW Phase
Angle
-Which of the following factors are NOT used in forecasting load?
1) Weather Forecast
2) Historical Load Forecast
3) Historical Weather Data
4) Locational Marginal Pricing (LMP) Data - -4
,-What one-way communication system is used to disseminate info to
local call centers? - -All-Call
-The 3 categories of messages issued by PJM All-Call all EXCEPT:
1) Operational
2) Informational
3) Conflicting Interchange Values
4) Emergency Procedures - -3
-When should, transmission outages should be submitted to PJM to avoid
cancellation and to be considered "on time?' - -First day of Month Prior
to the Outage
-What report will be requested by PJM when a Max Generation Alert is
issued? - -Supplementary Status Report (SSR)
-The loss of a large generation unit on the PJM system can be detected
by monitoring: - -Frequency and PJM Area Control Error (ACE)
-The PJM system is operated such that the contingency flow is less than
the: - -Emergency Rating
-When ordered a 5% voltage reduction should be taken on: - -The
Distribution System
-TOs are required to report "Hot Line Work" on what voltage levels? - -
345 kV and Above
-Load dump rating of an EHV line is determined by? - -115% of the
facility's 4 hour Emergency Rating
-During System Restoration, will closing additional tie lines increase the
strength & stability of an interconnected area? - -Yes
-Which of the following factors influence load forecast (3)?
1) Weather
2) Temperature
3) Reactive Reserves
4) Day of the week - -1, 2, 4
-During system restoration, what is the voltage range the system should
be kept between? - -90% and 105% maintain voltage profile between for
system restoration
-PJM will coordinate and direct all restoration lines of what voltage
levels? - -500kV and above
, -How much load would you dump to increase the frequency by 1 Hz
(percentage range)? - -6-10%
-Generation is disconnected after 5 seconds, when the frequency: - -
Drops below 57.5Hz
-How much of the total Dynamic Reserve should be used on Under
Frequency relay load? - -
-During System Restoration, capacitor banks should be kept off until
how much of the load is restored? - -40%
-Would PJM assume Frequency Control when the control of an
interconnected area is too burdensome for any Local Control Center? - -
Yes
-Operator receiving an All-Call message should state the following
before playback of the message? - -Name and Company
-Dynamic Reserves consist of: - -Governor Reserve and Load that has
been restored with under frequency relays
-What would be the appropriate response to receiving a DC ground
Alarm? - -Advise substation personnel of the alarm during normal hours
-An islanded system has a load of 3000 MW. To increase frequency by 1
Hz, how much load should be shed? - -180 MW
-Which of the following actions would be used FIRST to control a reactive
transfer limit violation?
a) Place reactors in service
b) Load offcost (out of merit) generation
c) Issue load dump warning
d) Modify firm transaction schedules - -B
-When available primary reserve capacity on a system is less than the
largest operating generator, or the loss of a transmission facility
jeopardizes reliable operations, PJM should issue a:
a) Manual load dump warning
b) Maximum emergency generation
c) Voltage reduction warning
d) Primary reserve alert - -A
-Increased load on a circuit causes lower voltage at the remote end.
Which of the following will increase this voltage?
a) Switch off the distribution circuit capacitors
b) Raise the generation supply at the remote end
Study/Updated/156 Questions
with Solved Answers/Graded A+
During System Restoration, what is the optimal Frequency Range? - -
59.75 - 61 Hz
-The 500 kV system has normal bus voltages between? - -500 to 550 kV
-When Connecting 2 islands, the operator must match? - -Voltage, Phase
Angle and Frequency
-What are the Minimum Source Requirements for a 500kV line?
(Gen/mile and load/mile) - -30 MW Gen/mile of energized 500 kV and 20
MW Load/mile of energized 500 kV
-When will PJM issue a Minimum Generation Alert? (how many MW under
normal operating limits) - -When expected generation levels fall within
2500 MW of normal operating limits
-When a thunderstorm is nearing the BES should auto-reclosing be
turned on? - -Yes
-What does SCADA stand for? - -Supervisory Control & Data Acquisition
-What does IROL stand for? - -Interconnection Reliability Operating Limit
-What does eDART stand for? - -Dispatcher Application and Reporting
Tool
-What is eDART used for? (Electronic Disp Reporting Tool) - -It is used
for: Generation Outage Scheduling, Instantaneous Reserve Checks,
Generator Reactive Capabilities and to enter and submit switching
-What direction do VARS flow? - -From HIGH Voltage to LOW Voltage
-What direction do MW flow? - -From HIGH Phase Angle to LOW Phase
Angle
-Which of the following factors are NOT used in forecasting load?
1) Weather Forecast
2) Historical Load Forecast
3) Historical Weather Data
4) Locational Marginal Pricing (LMP) Data - -4
,-What one-way communication system is used to disseminate info to
local call centers? - -All-Call
-The 3 categories of messages issued by PJM All-Call all EXCEPT:
1) Operational
2) Informational
3) Conflicting Interchange Values
4) Emergency Procedures - -3
-When should, transmission outages should be submitted to PJM to avoid
cancellation and to be considered "on time?' - -First day of Month Prior
to the Outage
-What report will be requested by PJM when a Max Generation Alert is
issued? - -Supplementary Status Report (SSR)
-The loss of a large generation unit on the PJM system can be detected
by monitoring: - -Frequency and PJM Area Control Error (ACE)
-The PJM system is operated such that the contingency flow is less than
the: - -Emergency Rating
-When ordered a 5% voltage reduction should be taken on: - -The
Distribution System
-TOs are required to report "Hot Line Work" on what voltage levels? - -
345 kV and Above
-Load dump rating of an EHV line is determined by? - -115% of the
facility's 4 hour Emergency Rating
-During System Restoration, will closing additional tie lines increase the
strength & stability of an interconnected area? - -Yes
-Which of the following factors influence load forecast (3)?
1) Weather
2) Temperature
3) Reactive Reserves
4) Day of the week - -1, 2, 4
-During system restoration, what is the voltage range the system should
be kept between? - -90% and 105% maintain voltage profile between for
system restoration
-PJM will coordinate and direct all restoration lines of what voltage
levels? - -500kV and above
, -How much load would you dump to increase the frequency by 1 Hz
(percentage range)? - -6-10%
-Generation is disconnected after 5 seconds, when the frequency: - -
Drops below 57.5Hz
-How much of the total Dynamic Reserve should be used on Under
Frequency relay load? - -
-During System Restoration, capacitor banks should be kept off until
how much of the load is restored? - -40%
-Would PJM assume Frequency Control when the control of an
interconnected area is too burdensome for any Local Control Center? - -
Yes
-Operator receiving an All-Call message should state the following
before playback of the message? - -Name and Company
-Dynamic Reserves consist of: - -Governor Reserve and Load that has
been restored with under frequency relays
-What would be the appropriate response to receiving a DC ground
Alarm? - -Advise substation personnel of the alarm during normal hours
-An islanded system has a load of 3000 MW. To increase frequency by 1
Hz, how much load should be shed? - -180 MW
-Which of the following actions would be used FIRST to control a reactive
transfer limit violation?
a) Place reactors in service
b) Load offcost (out of merit) generation
c) Issue load dump warning
d) Modify firm transaction schedules - -B
-When available primary reserve capacity on a system is less than the
largest operating generator, or the loss of a transmission facility
jeopardizes reliable operations, PJM should issue a:
a) Manual load dump warning
b) Maximum emergency generation
c) Voltage reduction warning
d) Primary reserve alert - -A
-Increased load on a circuit causes lower voltage at the remote end.
Which of the following will increase this voltage?
a) Switch off the distribution circuit capacitors
b) Raise the generation supply at the remote end
