Transmission Operations - A Flashcards
A 500 kv line, has sending end voltage of 1 per unit, receiving end voltage of 1 per unit, inductive reactance of .001 per unit ohms, and a power angle of a 30 degrees. What is the MW transfer on this transmission path?
A. 100 MW
B. 500 MW
C. 2000 MW
D. 1000 MW
B. 500 MW
All Transmission Operators shall operate so that instability, uncontrolled separation, or cascading outages will not occur as a result of the:
A. Loss of any two elements
B. Most severe single contingency
C. Most severe double contingency
D. Loss of any three elements
B. Most sever single contingency
A power system, with 1000 MW of load, has requirements that each of its members shed 5% of their load if voltage falls below 92 P.U. for 5 seconds or more, and shed an additional 5% of their load if the voltage falls below 90 P.U. for 3 seconds or more. If the system voltage falls to 89 and it lasts for 10 minutes, how much load would be shed?
A. 100 MW
B. 200 MW
C. 0 MW
D. 50 MW
A. 100 MW
A transmission line between Bus “A” and Bus “B” has MW flow from Bus “B” to Bus “A”. After the tripping of a parallel line, the line flow from Bus “B” to Bus “A” exceeds the lines thermal rating. Which of the following actions would assist the operator in correcting the problem?
A. Increase generation at Bus “A”
B. Increase generation at Bus “B”
C. Shed load at Bus “B”
D. Decrease generation at Bus “A”
A. Increase generation at Bus “A”
A transmission path has a short-term thermal limit of 1000 MVA, a long-term thermal limit of 900 MVA, a voltage stability related transfer limit of 850 MVA, and an angle stability related transfer limit of 1100 MVA. What this transmissions path’s short term operating limit?
A. 1000 MVA
B. 1100 MVA
C. 850 MVA
D. 900 MVA
C. 850 MVA
A transmission path has a short-term thermal limit of 1000 MVA, a long-term thermal limit of 900 MVA, a voltage stability related transfer limit of 850 MVA, and an angle stability related transfer limit of 1100 MVA. What is this transmission path’s short term operating limit?
A. 1000 MVA
B. 1100 MVA
C. 900 MVA
D. 850 MVA
D. 850 MVA
A power system uses Power Transfer Distribution Factors (PTDF) as part of their congestion management procedures. If a key transmission line is out-of-service which of the following factors is used to adjust the PTDF for the outage condition?
A. Outage transfer distribution factor (OTDF)
B. Line outage distribution factor (LODF)
C. Distribution factor (DF)
D. Generation shift factor (GSF)
A. Outage transfer distribution factor
A generator delivers its power to a multi-line transmission system. Of the multiple lines connected to the generator bus, Line X absorbs 25% of the generator output. If Line X has a transfer limit of 200 MW, what is the maximum output of the generator?
A. 1000 MW
B. 200 MW
C. 400 MW
D. 800 MW
D. 800 MW
A simple power system is composed of thress transmission lines that connect the generation area to the load area. The three lines are different lengths but each line has the same impedance and each line is initially loaded at 200 MW. The thermal limit of each line is 400 MW. If one of the three lines trip, what will the loading be on the shortest remaining line be and will the thermal limit of either of the remaining lines be violated?
A. 400 MW / Yes
B. 300 MW / No
C. 300 MW / Yes
D. 400 MW / No
B. 300 MW / No
200 MW is scheduled to flow from Bus “X” to Bus “Y”. Transmission line “A-B” has a 10% distribution factor for this schedule. How much of the 200 MW schedule will flow on transmission line “A-B”?
A. 180 MW
B. 40 MW
C. 200 MW
D. 20 MW
D. 20 MW
A 345 kv transmission line is energized at 345 kv and is 200 miles long. What is the approximate line charging contribution of this transmission line?
A. 200 MVAR
B. 500 MVAR
C. 140 MVAR
D. 50 MVAR
C. 140 MVAR
A balancing Authority must maintain adequate reactive power resources to:
A. Provide for their reactive load
B. Protect voltage levels under contingency conditions
C. Satisfy the NERC Reactive Operating Reserve Standards
D. Respond to their neighbors voltage control problems
B. Protect voltage levels under contingency conditions
Assume a TLR procedure has been implemented and Interchange Transactions have been curtailed. Assume further that the IROL violation has been removed and some Interchange Transactions can be resumed. Which Interchange Transactions should (if possible) be re-established first?
A. Those serving firm loads
B. Those with the lowest Transmission Service priority
C. Those with the highest Transmission Service priority
D. Those serving non-firm loads
C. Those with the highest Transmission Service priority
A Transmission Operator suffers a major disturbance and fails to return their system to within an IROL after 30 minutes. Within what time period must the Transmission Operator report this compliance violation to their RRO and NERC?
A. 36 hours
B. 48 hours
C. 24 hours
D. 72 hours
D. 72 hours
A transmission path has a short-term thermal limit of 1000 MVA, a long-term thermal limit of 900 MVA, a voltage stability related transfer limit of 150 MVA, and an angle stability related transfer limit of 1100 MVA. What is this transmission path’s short-term operating limit?
A. 950 MVA
B. 1000 MVA
C. 850 MVA
D. 1400 MVA
B. 1000 MVA
