Questions Flashcards
Which MVAR resource device would you normally use first?
a) Inductive cancelations
b) Shunt reactors
c) Shunt capacitors
d) Generator MVAR reserves
C
Why would a Voltage reduction be implemented?
a) Reducing load on the transmission system
b) Increasing current on the transmission system
c) Increasing load on the distribution system
d) Reducing load on the distribution system
D
Which corrective action should a Transmission Operator take to prevent voltage collapse
when reactive resources are insufficient?
a) Closing in reactors
b) Switching out transmission
c) Shedding load
d) Exceeding established limits
C
Which corrective action should a Transmission Operator take to prevent voltage collapse
when reactive resources are insufficient?
a) Closing in reactors
b) Switching out transmission
c) Shedding load
d) Exceeding established limits
B
Lower impedance, more capacitive
Which of the following conditions is an acceptable mitigating action for which the
Transmission Operator should open a transmission line?
a) Low voltages under heavy loads
b) High voltages under light loads
c) Studies indicate another line will exceed its limit
d) Opening a line is not acceptable under any conditions
B
Voltage is high due to off‐peak demand. There are several lightly loaded high voltage
transmission lines going to radial loads. All capacitor banks are ‘off‐line’ and available.
What should be done first to lower the voltage?
a) De‐energize the lightly loaded lines
b) Use generators to absorb VARs
c) Place a capacitor banks in service as needed
d) Increase voltage to increase load
B
A radial transmission line feeding a load is overloaded. The transmission operator must
do which of the following to unload the line?
a) Lower the voltage on the receiving end
b) Shed load at the end of the line
c) Raise voltage at the receiving end
d) Raise the voltage on the sending end
B
Cannot raise voltage at load- radial line
A System Operator identifies a transmission line that is operating at 100% of its system operating limit (SOL). What should be done?
a) Immediately reduce the loading
b) Monitor and be prepared to take action
c) Reduce voltage schedule
d) Open the line
B
You have just placed a line in service and the receiving bus end of the line shows zero
voltage, but there is indication of current flow.
What is your primary concern?
a) The low voltage at the bus
b) Loss of synchronizing capability
c) Loss of primary protection
d) A potential voltage collapse
C
There is a Remedial Action Scheme out of service for maintenance in your Balancing
Area. Which is the most appropriate action to take?
a) Be prepared to take the action that the RAS would take
should the triggering condition occur
b) No action is necessary because an RAS is not a relay
protection system
c) Operate within the system limits that the RAS is designed
to protect against
d) Remove the line from service that includes the RAS
C
You discover that Bus A is de‐energized. Each of the line breakers off of the bus are
closed. However, the breakers at the other end of each line from the bus are open.
What is the most likely cause for this arrangement?
a) Failure of a Distance Relay
b) Failure of a Bus Differential
Relay
c) Breaker failure relay operation
d) Inadvertent operation
B
OP-010, Geomagnetic Disturbance Operations, is applicable to Reliability Coordinators and Transmission Operators whose area includes which of the following?
Select the best answer.
A) Transformer(s) with high side wye-grounded winding 100 kV and above
B) Wye-grounded generators with terminal voltage 100 kV and above
C) Any grounded equipment
D) Transformer(s) with high side wye-grounded winding 200 kV and above
E) None of the above
D
You discover that Bus A is de-energized. Each of the line breakers off of the bus are closed. However, the breakers at the other end of each line from the bus are open. What is the most likely cause for this arrangement?
a. Failure of a Distance Relay
b. Failure of a Differential Relay
c. Breaker failure relay operation
d. Inadvertent operation of a ground relay
B
An airplane crashes into a tower for line 2 causing it to fall. Line 2 is one of several lines into Bus “A”. What relay most likely operated?
a. Phase-to-ground on line 1
b. Differential Relay on Bus “A”
c. Phase-to-phase on line 2
d. Under-frequency relay
C
What information does an RC need to perform its reliability study?
a. Market trends, generation, transmission, reactive reserves
b. Load, generation, transmission, forced outages
c. Generation, VAR reserves, load
d. Load, generation, critical facility status, operating reserves, interchange
D
Your EMS and AGC have failed and generation must be controlled manually. At the top of the hour, load is expected to increase 100 MWs, imports will increase by 75 MWs, and ACE is reading 25 MWs. What should the operator do?
a. Decrease generation by 25 MWs
b. Decrease generation by 50 MWs
c. Increase generation by 25 MWs
d. Increase generation by 50 MWs
C
Why is it important that governor droops be set correctly?
i. Help arrest frequency excursions
ii. Maintain frequency at 60.00 Hz
iii. To not overreact to small frequency variations
a. i. and ii.
b. ii. and iii.
c. i. and iii.
C
A Balancing Authority that is a member of a Generation Reserve Sharing Group is the Responsible Entity only in periods during which the Balancing Authority is not in active status under the applicable agreement or the governing rules for the Generation Reserve Sharing Group.
True or False
False
A Balancing Authority that is a member of a REGULATION Reserve Sharing Group is the Responsible Entity only in periods during which the Balancing Authority is not in active status under the applicable agreement or the governing rules for the REGULATION Reserve Sharing.
NERC Standard BAL-001
Which of the following terms is defined as the scan rate values of a Balancing Authority’s ACE measured in MW, which includes the difference between the Balancing Authority’s Net Interchange Actual and its Net Interchange Scheduled, plus its Frequency Bias obligation, plus any known meter error.
ACE Control Error
Automatic Time Error
Reserve Sharing Group Reporting
Reporting ACE
Reporting ACE
Feedback: Reporting ACE is defined as the scan rate values of a Balancing Authority’s ACE measured in MW, which includes the difference the Balancing Authority’s Net Interchange Actual, and its Net Interchange Scheduled, plus its Frequency Bias obligation, plus any known meter error.
What is the definition of Confirmed Interchange?
A) The state where no party has denied, and the Balancing Authority approves the Arranged Interchange
B) The state where no party has denied, and the Transmission Operator approves the Arranged Interchange
C) Interchange that has been approved by the Reliability Coordinator
D) The state where no party has denied, and all required parties have approved the Arranged Interchange
Feedback: Confirmed Interchange - The state where no party has denied and all required parties have approved the Arranged Interchange.
D) The state where no party has denied, and all required parties have approved the Arranged Interchange
Feedback: Confirmed Interchange - The state where no party has denied and all required parties have approved the Arranged Interchange.
Planned transmission outages shall be coordinated with whom?
a) All PSEs within that region
b) All systems connected to the information network
c) Any system coordinator who is on shift at the time of the outage
d) Any system that planning studies show might be impacted
D
Following a Disturbance in which one or more areas of the BES shuts down and the use of Blackstart Resources is required to restore the area to service, who is responsible for implementing the System Restoration Plan?
A) Balancing Authority
B) Transmission Operator
C) Reliability Coordinator
D) Generator Operator
B) Transmission Operator
As the demand for electricity varies, which parameter is monitored to ensure a generation-load balance in each interconnection?
A) ACE
B) Frequency
C) Interchange
D) Tie-line flow
B) Frequency
