NERC QUESTIONS AND ANSWERS

A misoperation occurred when an overhead ground wire on a 230KV transmission line between two substations broke and fell across A phase of the line. One of the line circuit breakers failed to open causing the breaker failure relay to pick up and as a result tripped the entire substation bus off line that the failed circuit breaker was feeding off of. Who is charged with the responsibility to develop procedures to ensure misoperations are reviewed and analyzed to determine proper mitigation plans? - Answer- D. Regional Reliability Organization for the area. The transmission operator that you work for is installing new relays on some of their major transmission tie lines using newer technology. Who should your company notify before work is begun? - Answer- C. Neighboring Transmission Operators, Balancing authorities, and Generator Operators. When shall the transmission Operators and balancing authorities review and update emergency plans? - Answer- A. Annually When the responsible entity tags a dynamic schedule, what values should it use for the energy profile? - Answer- Expected average MW profile for each hour. You are reliability coordinator in the eastern interconnection. Transmission Operator AB is in your Reliability Area. Transmission Operator AB reports that a 600 MW generator that tripped offline has caused an overload of a 345/138/13KV Inter-tie Transformer Bank. You realize that if the overloaded transformer trips off line, it would create an IROL. There are several Interchange Transactions that have parallel flows that are flowing through that transformer. What should you do? - Answer- D. Issue a TLR on enough interchange transactions starting with the lowest priority and working up, until enough are curtailed to relieve the transformer from its overload condition. Which entities may determine the deviation of a dynamic schedule constitutes a Reliability concern? Also, what entity must notify of that determination and the reason for the determination? - Answer- B. A Reliability Coordinator or transmission operator makes the determination and must notify the purchasing-selling entity. Which entity would make the original request for an EEA event? - Answer- A. Balancing Authority At 0620 local time, interconnection frequency is 60.025 Hz. Balancing Authority A's ACE at that time is -100MW and it's L10 value is 50MW. By 0625, it's ACE has changed to -25MW and the frequency has decreased to 60.012 Hz. By 0630, A's ACE is -5MW and frequency is 60.001 Hz. For the 10 minute period, balancing authority A's average ACE was 55MW. What control performance standard has the BA violated(if any)? - Answer- B. CPS 2 T