PJM Transmission Exam Study Questions And
Correct Answers
What does SCADA stand for? - ANSWER Supervisory Control & Data Acquisition
What is the optimum Frequency Range at System Restoration? - ANSWER 59.75 - 61 Hz
What is the typical bus voltage range for the 500 kV system? - ANSWER 500 to 550 kV
When Tying 2 islands, what does the operator need to match? - ANSWER Voltage, Phase
Angle and Frequency
What is the Minimum Source Requirements for a 500kV line? (Gen/mile and load/mile) -
ANSWER 30 MW Gen/mile of energized 500 kV and 20 MW Load/mile of energized 500 kV
Under what circumstances will PJM declare a Minimum Generation Alert? (how many
MW under normal operating limits) - ANSWER When expected generation levels fall
within 2500 MW of normal operating limits
When a thunderstorm is approaching the BES should auto-reclosing be enabled? -
ANSWER Yes
What does IROL stand for? - ANSWER Interconnection Reliability Operating Limit
What does eDART stand for? - ANSWER Dispatcher Application and Reporting Tool
,What is eDART used for? (Electronic Disp Reporting Tool) - ANSWER It is used for:
Generation Outage Scheduling, Instantaneous Reserve Checks, Generator Reactive
Capabilities and to enter and submit switching
What direction do VARS flow? - ANSWER From HIGH Voltage to LOW Voltage
What direction do MW flow? - ANSWER 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 - ANSWER 4
What one-way communication system is utilized to broadcast information to local call
centers? - ANSWER All-Call
The 3 categories of messages published by PJM All-Call all EXCEPT:
1) Operational
2) Informational
3) Conflicting Interchange Values
4) Emergency Procedures - ANSWER 3
When should, transmission outages should be submitted to PJM to avoid cancellation
and to be considered "on time?' - ANSWER First day of Month Prior to the Outage
What report will be requested by PJM when a Max Generation Alert is issued? - ANSWER
Supplementary Status Report (SSR)
This would be detected by monitoring: - ANSWER Frequency and PJM Area Control
,Error (ACE)
The PJM system is operated such that the contingency flow is less than the: - ANSWER
Emergency Rating
When ordered a 5% voltage reduction should be taken on: - ANSWER The Distribution
System
TOs must report "Hot Line Work" on what voltage levels? - ANSWER 345 kV and Above
Load dump rating of an EHV line is based upon? - ANSWER 115% of the facility's 4 hour
Emergency Rating
During System Restoration, does the closing of additional tie lines increase the strength
& stability of an interconnected area? - ANSWER Yes
Which of the following are factors that affect load forecast (3)?
1) Weather
2) Temperature
3) Reactive Reserves
4) Day of the week - ANSWER 1, 2, 4
During system restoration, what is the voltage range the system should be kept
between? - ANSWER 90% and 105% maintain voltage profile between for system
restoration
PJM will coordinate and direct all restoration lines of what voltage levels? - ANSWER
500kV and above
, How much load would you dump to increase the frequency by 1 Hz (percentage range)?
- ANSWER 6-10%
Generation is disconnected after 5 seconds, when the frequency: - ANSWER Drops
below 57.5Hz
How much of the total Dynamic Reserve should be used on Under Frequency relay load?
- ANSWER
During System Restoration, capacitor banks should be kept off until how much of the
load is restored? - ANSWER 40%
Would PJM take over Frequency Control when the control of an interconnected area is
too great for any Local Control Center to handle? - ANSWER Yes
Operator receiving an All-Call message should state the following before playback of the
message? - ANSWER Name and Company
Dynamic Reserves consist of: - ANSWER Governor Reserve and Load that has been
restored with under frequency relays
What would be the appropriate response to receiving a DC ground Alarm? - ANSWER
Inform substation personnel of the alarm if during normal hours
An islanded system serves 3000 MW load. How much MW should be shed if you wanted
to raise the frequency by 1 Hz? - ANSWER 180 MW
Which of the following activities would be performed FIRST to control a reactive transfer
limit violation?
a) Put reactors in service
Correct Answers
What does SCADA stand for? - ANSWER Supervisory Control & Data Acquisition
What is the optimum Frequency Range at System Restoration? - ANSWER 59.75 - 61 Hz
What is the typical bus voltage range for the 500 kV system? - ANSWER 500 to 550 kV
When Tying 2 islands, what does the operator need to match? - ANSWER Voltage, Phase
Angle and Frequency
What is the Minimum Source Requirements for a 500kV line? (Gen/mile and load/mile) -
ANSWER 30 MW Gen/mile of energized 500 kV and 20 MW Load/mile of energized 500 kV
Under what circumstances will PJM declare a Minimum Generation Alert? (how many
MW under normal operating limits) - ANSWER When expected generation levels fall
within 2500 MW of normal operating limits
When a thunderstorm is approaching the BES should auto-reclosing be enabled? -
ANSWER Yes
What does IROL stand for? - ANSWER Interconnection Reliability Operating Limit
What does eDART stand for? - ANSWER Dispatcher Application and Reporting Tool
,What is eDART used for? (Electronic Disp Reporting Tool) - ANSWER It is used for:
Generation Outage Scheduling, Instantaneous Reserve Checks, Generator Reactive
Capabilities and to enter and submit switching
What direction do VARS flow? - ANSWER From HIGH Voltage to LOW Voltage
What direction do MW flow? - ANSWER 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 - ANSWER 4
What one-way communication system is utilized to broadcast information to local call
centers? - ANSWER All-Call
The 3 categories of messages published by PJM All-Call all EXCEPT:
1) Operational
2) Informational
3) Conflicting Interchange Values
4) Emergency Procedures - ANSWER 3
When should, transmission outages should be submitted to PJM to avoid cancellation
and to be considered "on time?' - ANSWER First day of Month Prior to the Outage
What report will be requested by PJM when a Max Generation Alert is issued? - ANSWER
Supplementary Status Report (SSR)
This would be detected by monitoring: - ANSWER Frequency and PJM Area Control
,Error (ACE)
The PJM system is operated such that the contingency flow is less than the: - ANSWER
Emergency Rating
When ordered a 5% voltage reduction should be taken on: - ANSWER The Distribution
System
TOs must report "Hot Line Work" on what voltage levels? - ANSWER 345 kV and Above
Load dump rating of an EHV line is based upon? - ANSWER 115% of the facility's 4 hour
Emergency Rating
During System Restoration, does the closing of additional tie lines increase the strength
& stability of an interconnected area? - ANSWER Yes
Which of the following are factors that affect load forecast (3)?
1) Weather
2) Temperature
3) Reactive Reserves
4) Day of the week - ANSWER 1, 2, 4
During system restoration, what is the voltage range the system should be kept
between? - ANSWER 90% and 105% maintain voltage profile between for system
restoration
PJM will coordinate and direct all restoration lines of what voltage levels? - ANSWER
500kV and above
, How much load would you dump to increase the frequency by 1 Hz (percentage range)?
- ANSWER 6-10%
Generation is disconnected after 5 seconds, when the frequency: - ANSWER Drops
below 57.5Hz
How much of the total Dynamic Reserve should be used on Under Frequency relay load?
- ANSWER
During System Restoration, capacitor banks should be kept off until how much of the
load is restored? - ANSWER 40%
Would PJM take over Frequency Control when the control of an interconnected area is
too great for any Local Control Center to handle? - ANSWER Yes
Operator receiving an All-Call message should state the following before playback of the
message? - ANSWER Name and Company
Dynamic Reserves consist of: - ANSWER Governor Reserve and Load that has been
restored with under frequency relays
What would be the appropriate response to receiving a DC ground Alarm? - ANSWER
Inform substation personnel of the alarm if during normal hours
An islanded system serves 3000 MW load. How much MW should be shed if you wanted
to raise the frequency by 1 Hz? - ANSWER 180 MW
Which of the following activities would be performed FIRST to control a reactive transfer
limit violation?
a) Put reactors in service
