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An 800 MW generator trips in a Balancing Authority external to your Balancing Authority Area. Which of the following indications would you expect to see in your area? A) Net Actual Interchange would decrease significantly. B) ACE would drop to approximately -800 MW. C) Frequency would drop, and ACE would remain relatively unchanged. D) Frequency would drop, and ACE would increase significantly. - ...ANSWER...C) Frequency would drop, and ACE would remain relatively unchanged.
When is the only time voltage reduction for load relief is acceptable on the transmission system? A) When voltage on the distribution system is already low. B) It is acceptable anytime load relief is needed. C) When the system is separated from the Interconnection. D) When Interconnection frequency is above 60.00 Hz.
next 7 minutes - ...ANSWER...C) Immediately take actions to raise the voltage EXCEPT removing firm system load. Notify the RC and neighboring BA's. Prepare for manual load reduction if the voltage remains below .9 p.u. over the next 7 minutes. A condition when a Load-Serving Entity has exhausted all other options and can no longer provide its customers' expected energy requirements is referred to A) Energy Emergency B) Energy deficiency C) Load shortage D) Energy shortage - ...ANSWER...A) Energy Emergency You are currently in the early stages of restoration with 600 MWs of synchronized generation. There is 200 MWs of spinning reserve available. To maintain acceptable frequency control, what is the largest block of load that can be restored at one time? A) 10 MWs B) 20 MWs C) 30 MWs D) 60 MWs - ...ANSWER...C) 30 MWs If firm Load shed is imminent or in progress, what level Energy Emergency Alert is required? as?
Why are high transmission system voltages a problem during system restoration? A) Because of the excessive MVAR supply from generators. B) Because of the excessive MVAR supply from energizing transmission lines. C) Because of shunt reactors that were left in service after the system collapse. D) Because of insufficient MVAR supply from generators that tripped off. - ...ANSWER...B) Because of the excessive MVAR supply from energizing transmission lines. What is the most important information for load forecasting? A) Planned generation outages B) Planned transmission outages C) Historic load
A) 400 MW/Yes B) 400 MW/No C) 300 MW/Yes D) 300 MW/No - ...ANSWER...D) 300 MW/No During a lightning storm, a fault on a transmission line results in the transmission relay operating and locking- out. The transmission line cannot be returned to service. After running a contingency analysis, the Transmission Operator realizes that if another transmission line relays, there could be cascading outages into a neighboring system. Which of the following actions is appropriate for the Transmission Operator? A) Reduce transmission voltages by 5% to reduce customer demand. B) Notify others in the Interconnection of the situation via an Interconnection-wide telecommunications system. C) Continue operations without notifying anyone but try to reduce system loading. D) Prepare a disturbance report and forward it to the Reliability Coordinator. - ...ANSWER...B) Notify others in the Interconnection of the situation via an Interconnection-wide telecommunications system.
A Generator Operator has some vibration problems with a 500MW coal fired steam generator. As the result of the vibration problems the Generator Operator has to set the maximum reactive power production for that unit at 25 Megavar instead of the normal 200 Megavar. Who should the generator operator notify as the result of this problem? A) Transmission Operator B) System Coordinator C) Department of Energy (DOE) D) Regional Reliability Organization - ...ANSWER...A) Transmission Operator A high voltage transmission line was scheduled out for routine maintenance several weeks in advance. On the scheduled outage date, field personnel call to inform the system operator that they will be taking the line out of service. Bad weather the previous day has forced other outages. What should the system operator do? A) Wait until peak is over to make a decision B) Run a power flow study to determine the effects of this line outage C) Do not allow the outage
A) Solar Power B) Real Power C) Reactive Power D) Apparent Power - ...ANSWER...C) Reactive Power You are a transmission operator and you have several large generators operating at full load on the western portion of your transmission system with 34 kV and 230 kV transmission lines connecting the generators to the larger metropolitan and Industrial areas in the eastern portion of your transmission system. You realize by SCADA indications that there is a large power angle approaching 88 degrees between some of the sending busses at the generation sites and the receiving buses around the load areas. You realize that the slightest contingency on the system could elevate the power angle above 90 degrees which could cause the generation and load areas to lose synchronism. What would be some of your first immediate responses to prevent this from happening? A) Raise the bus voltage at the receiving buses and at the sending buses, if possible. Then, have the balancing operator provide additional generation on line on th - ...ANSWER...A) Raise the bus voltage at the receiving buses and at the sending buses, if possible. Then, have the balancing operator provide additional generation on line on the eastern portion of the large metropolitan area
A System Operator must operate the transmission system so that instability, uncontrolled separation, or cascading outages will not occur as a result of . A) The most severe single contingency B) Normal operations C) External disturbances D) Any unplanned outage - ...ANSWER...A) The most severe single contingency Which of the following actions would be required in accordance with COM-002-4 when communicating an Operating Instruction? A) A Balancing Authority repeats the operating instruction back to the Reliability Coordinator. B) A Reliability Coordinator clearly states the Operating Instruction. C) A Reliability Coordinator confirms the instruction was understood correctly or corrects the response if it is not repeated back correctly. D) All the Above - ...ANSWER...D) All the Above The largest single contingency for Balancing Authority A is a unit rated at 900 MW. Which of the following
B) Specify actions to be included in the Transmission Operator's GMD Operating Procedures C) Disseminate information concerning GMDs to entities in the Reliability Coordinator's Operating Plan D) Coordinate the GMD Operating Procedures of Transmission Operators in their area - ...ANSWER...B) Specify actions to be included in the Transmission Operator's GMD Operating Procedures A transformer rated at 50 MVA is currently carrying 30 MW of load. At this load, what is the maximum allowable MVAR flow through the transformer? A) 50 MVAR B) 30 MVAR C) 40 MVAR D) 0 MVAR - ...ANSWER...C) 40 MVAR System Operators shall act to maintain the reliability of its Area through actions of their own or by issuing Operating Instructions, such as, canceling outages, transmission reconfiguration, generation re-dispatch and load shed for what purpose? A) Prevent power flow B) Prevent uncontrolled separation and Cascading outages C) Serve interchange transactions
D) Serve commercial loads - ...ANSWER...B) Prevent uncontrolled separation and Cascading outages When two identical A/C generating units are operated in parallel on governor control, and one machine has a 5% droop and the other has a 10% droop, the unit with the greater governor droop will... A) No adjustment for frequency changes. B) Share load equally with the other machine. C) Tend to take the greater portion of load changes. D) Tend to take the lesser portion of load changes. - ...ANSWER...D) Tend to take the lesser portion of load changes. A conductor is rated for 180 MVA, the current transformer at one end is rated at 160 MVA and the bus is rated at 200 MVA. What is the MVA limit for this transmission line? A) 160 MVA B) 100 MVA C) 180 MVA D) 200 MVA - ...ANSWER...A) 160 MVA If a high voltage current (HVDC) ties is on the Scheduling Path for a transaction, the
Who must approve a Reliability Adjustment Arranged Interchange before it becomes Confirmed Interchange? A) Only the Source and Sink Balancing Authorities associated with the Interchange B) The Reliability Coordinator approves all Reliability Adjustment Arranged Interchange C) All Balancing Authorities involved in the Interchange D) Each Balancing Authority and Transmission Service Provider associated with the Interchange - ...ANSWER...A) Only the Source and Sink Balancing Authorities associated with the Interchange A Reliability Adjustment Arranged Interchange has been submitted and the Source Balancing Authority for the Interchange must deny it due to a reliability issue. What action must the Balancing Authority take? A) A Source BA cannot deny a Reliability Adjustment Arranged Interchange B) Inform the Transmission Service Providers of the Denial. C) Submit a Request for Denial within 10 minutes
D) Notify the BA's Reliability Coordinator of the denial within 10 minutes - ...ANSWER...D) Notify the BA's Reliability Coordinator of the denial within 10 minutes The Source Balancing Authority must assess the following items of Arranged Interchange before approving: A) Scheduling path connectivity B) Megawatt profile including Ramp start and stop times C) Interchange duration D) All the answers are correct - ...ANSWER...D) All the answers are correct The total capacity of a facility in a transmission path is 1600 MW. The Available Transfer Capability of the same path from A to B is 1200 MW. An unscheduled (parallel) flow of 600 MW is also present from A to B. What is the maximum net interchange that can be scheduled from A to B? A) 1600 MW B) 600 MW C) 1200 MW D) 1000 MW - ...ANSWER...C) 1200 MW Balancing Authority A (BA A) has two tie-lines with BA B with MW readings of +100 MW and -50 MW respectively. BA C has two tie-lines with BA B with
A) Update Regional Reliability Organization and NERC B) Notify all Reliability Coordinators in NERC C) Notify the Reliability Coordinator D) To address and mitigate operating Emergencies - ...ANSWER...D) To address and mitigate operating Emergencies Which of the following would not be considered in determining ratings on transmission facilities? A) Power Transfer Distribution Factor B) Thermal limits C) Voltage limits D) Short-term loading limits - ...ANSWER...A) Power Transfer Distribution Factor When would be the best time to schedule a capacitor bank outage? A) During projected light loading. B) During winter peak loading. C) During summer peak loading.
D) When all the other reactive sources are scheduled for an outage. - ...ANSWER...A) During projected light loading. Two lines of the same construction are both connected to Bus A and are both open at the other end. Line #2 is twice as long as Line #1. The voltage at the open end of Line #1 is 3% higher than the voltage at Bus A. What can you conclude about the voltage at the open end of Line #2? A) 3% lower than Bus A. B) More than 3% lower than Bus A. C) 3% higher than Bus A. D) More than 3% higher than Bus A. - ...ANSWER...D) More than 3% higher than Bus A. In a system that is more capacitive than inductive, the current sine wave will lead the voltage sine wave which A) decrease load B) raise C) have no effect D) lower - ...ANSWER...B) raise A Transmission Operator experiences the unexpected loss of an internal 230 kV transmission line. This line will be out of service for more than two hours. The expected system peak will also be in the next two hours. tends to voltage.