Transmission Operations - B

Question 1

Three transmission lines connect a generation source to a load area. Line #1 has an impedance of 40 ohms, line #2 = 60 ohms, and line #3 = 40 ohms. Total power flow is initially 1000 MW. Assume that line #1 trips. Assuming no generation or load changes and neglecting losses, what will be the MW flow on line #2?

A. 600 MW
B. 800 MW
C. 1000 MW
D. 400 MW

Answer 1

D. 400 MW

Question 2

Responding to operating security limit violations is necessary only when:

A. Violations occur or are expected to occur.
B. It may lead to voltage collapse.
C. There is a reduction in the amount of Interchange Transactions.
D. It will cause cascading outages.

Answer 2

A. Violations occur or are expected to occur

Question 3

If a Transmission Operator has an anticipated emergency condition, it shall inform _______

A. Its Balancing Authority and Load Serving Entity
B. Its reliability Coordinator and any other potentially affected Transmission Operators
C. Its Generator Operator and Balancing Authority
D. Its Purchase Selling Entity and Interchange Authority

Answer 3

B. Its Reliability Coordinator and any other potentially affected Transmission Operators

Question 4

Three transmission lines connect a generation source to a load area. Line #1 has an impedance of 100 ohms, line #2 = 50 ohms, and line #3 = 50 ohms. Total power flow is initially 1000 MW. Assume that line #1 trips. Assuming no generation or load changes and neglecting power losses, what will be the MW flow on line #3?

A. 500 MW
B. 400 MW
C. 1000 MW
D. 1500 MW

Answer 4

A. 500 MW

Question 5

True or False: A Balancing Authority is obligated to operate to protect against uncontrolled separation from a single most severe contingency

A. True
B. False

Answer 5

A. True

Question 6

Dynamic thermal ratings are ratings that limit transmission line loading

A. With current temperature and wind speed
B. Based on projected transaction schedules
C. Based on current transaction schedules
D. With a conservative mind set

Answer 6

A. With current temperature and wind speed

Question 7

In what manner is voltage reduction typically implemented to obtain load relief?

A. Appealing to the public
B. Changing transformer taps
C. Providing a potential difference
D. Increasing amp flow

Answer 7

B. Changing transformer taps

Question 8

There are pieces of equipment whose primary function is to adjust system MW flow. One example of this type of equipment is a

A. Tap changing transformer
B. Reactor
C. Capacitor
D. Phase shifting transformer (PST)

Answer 8

D. Phase shifting transformer (PST)

Question 9

Total transfer capability is defined as:

A. The maximum amount of power that can be scheduled over a transfer path

B. The total actual and scheduled power that can be transferred over a transfer path minus USF.

C. The maximum amount of actual power that can be transferred over a transfer path

D. The total scheduled power, plus any unscheduled flows, which may flow over a transfer path

Answer 9

C. The maximum amount of actual power that can be transferred over a transfer path

Question 10

If your system experiences an IROL violation, as an operator, you are supposed to return your transmission system to within its limits as soon as possible, but no longer than how many minutes?

A. 30 Minutes
B. 60 Minutes
C. 10 Minutes
D. 20 Minutes

Answer 10

A. 30 Minutes

Question 11

Two parallel transmission lines are both rated for 480 MVA and are currently loaded at 300 MVA each. If one of the lines trip, it will cause the other line to be loaded above its rating by more than 100 MVA. What should you do if you receive notification that due to a system emergency one of the lines must come out of service?

A. Re-dispatch available generation and remove the line from service
B. Delay the outage until a nearby steam unit can be started
C. Wait until the line trips on its own
D. Take the line out of service and shed 100 MW of load

Answer 11

A. Re-dispatch available generation and remove the line from service

Question 12

Following a contingency or other event that results in an Operating Security Limit Violation, the Balancing Authority shall return its transmission system to within Operating Security Limits as soon as possible, but no longer than

A. 20 minutes
B. 60 minutes
C. 10 minutes
D. 30 minutes

Answer 12

D. 30 minutes

Question 13

Three transmission lines connect a generation source to a load area. Line #1 has an impedance of 30 ohms, line #2 = 40 ohms and line #3 = 60 ohms. Total power flow is initially 2000 MW. Assume that line #1 trips. Assuming no generation or load changes and neglecting power losses, what will the MW flow on line #3?

A. 1600 MW
B. 400 MW
C. 800 MW
D. 1200 MW

Answer 13

C. 800 MW

Question 14

Computer simulations show that for a 100 MW schedule from Bus “A” to Bus “B”, 63 MW of the schedule will flow on the scheduled path and the remainder will flow on other parallel paths. What is the distribution factor for the unscheduled paths?

A. 1
B. 0
C. 0.37
D. 0.63

Answer 14

C. 0.37

Question 15

In order for each Transmission Operator to protect its system’s voltage levels under normal and contingency conditions, they must acquire which of the following?

A. Sufficient transmission capacity
B. Sufficient reactive resources
C. Dynamic reactive resources
D. Sufficient generation supplies

Answer 15

C. Dynamic reactive resources

Question 16

Transmission lines may be removed from service for voltage control only:

A. After studies indicate that system reliability will not be degraded below acceptable levels
B. If the lines are energized at 230 kv or higher
C. With the consent of neighboring systems
D. If the lines are initially open-ended

Answer 16

A. After studies indicate that system reliability will not be degraded below acceptable levels

Question 17

The total transfer capability of a line is 250 MW, the posted ATC for this line is 200 MW. There is a 100 MW schedule being used for this line. How much available transfer capability is left for this line?

A. 100 MW
B. 200 MW
C. 150 MW
D. 50 MW

Answer 17

A. 100 MW

Question 18

The IDC contains a database of distribution factors. What is a distribution factor?

A. A probability factor that indicates the probability of the loss of a specific transmission element

B. A reference number that relates a given interchange transaction to an OASIS reservation

C. A per-unit or percent value that indicates how much of a given interchange transaction flows across a given transmission facility

D. An estimate of the transmission losses incurred by a given interchange transaction

Answer 18

C. A per-unit or percent value that indicates how much of a given interchange transaction flows across a given transmission facility

Question 19

Line switching of a line internal to a balancing Authority must be fully coordinated only

A. During emergency conditions
B. If the internal line operating voltage is greater than 230 kv
C. If it can affect the operation of the interconnected power system
D. If the internal line capacity is greater than 200 MW

Answer 19

C. If it can affect the operation of the interconnected power system

Question 20

Generation is not sufficient to meet load, the Balancing Authority is importing to its transfer limits and voltage is decaying. Which of the following actions should be taken by the system operator?

A. Use the Interconnection Hotline
B. Shed load
C. Correct the schedule deviation
D. Schedule an interchange transaction

Answer 20

B. Shed load