NERC Exam Study Guide Questions

NERC Exam Study Guide Questions Two phase conductors of a 138kV transmission line come in contact due to a storm, creating a phase to phase fault. The distance relay at each end of the line tripped and isolated the lin ...

NERC Exam Study Guide Questions Two phase conductors of a 138kV transmission line come in contact due to a storm, creating a phase to phase fault. The distance relay at each end of the line tripped and isolated the line. What two measured parameters of the line caused the distance relay to operate? Temperature and length MWs and MVARs Voltage and current Resistance and Impedance - ✔✔Voltage and current What is the main cause for having low voltage on the Transmission and Distribution system? Over generation in the Interconnection Not enough transmission line in service Excessive of reactive resources A shortage of reactive resources - ✔✔A shortage of reactive resources The largest single contingency for Balancing Authority A is a unit rated at 900 MW. Which of the following disturbances would constitute a reportable disturbance for DCS evaluation based on the NERC DCS criteria? The loss of a 700 MW generating unit at 100% output. The loss of the 900 MW generating unit at 60% output. The loss of two 400 MW units 30 seconds apart. The loss of 750 MW of firm load. - ✔✔The loss of two 400 MW units 30 seconds apart. Which of the following actions is appropriate for preserving the reliability of the Interconnection during a low voltage emergency? Switch in reactors Arrange for interchange sales during high price periods Removing key transmission lines from service Raise generator - ✔✔Raise generator 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? 180 MVA 200 MVA 160 MVA 100 MVA - ✔✔160 MVA Frequency has been running at 59.96 Hz for the last hour and your ACE has hovered right at zero for the entire hour. Your Frequency Bias Setting (B) is 50 MW/.1 Hz. What would be your approximate Inadvertent Interchange for the hour? Zero 40 MWs out 20 MW out 20 MWs in - ✔✔20 MW out Which entity integrates resource plans ahead of time, maintains load-interchange-generation balance within a Balancing Authority Area, and supports Interconnection frequency in real time? Transmission Operator Reliability Coordinator Balancing Authority Regional Reliability Organization - ✔✔Balancing Authority Training staff must be identified, and competent in both knowledge of system operations and _____________. finance issues planning instructional capabilities power marketing - ✔✔instructional capabilities On a mild spring day, a transmission line trips. The line then trips again when energized. Which of the following is least likely to be the problem? Overload Equipment failure Sabotage Vandalism - ✔✔Overload When energy demand and operating reserves require all resources dedicated to firm load and maintaining regulating reserves, what action(s) should be taken? Issue NERC EEA1 Request local Balancing Authorities to start off-line generating resources. Request generation output at maximum levels All of the Above - ✔✔All of the Above A Balancing Authority that is experiencing a potential capacity or energy emergency and communicates its current and expected future system conditions to its Reliability Coordinator. What would likely be the Reliability Coordinators first action? Notify all Reliability Coordinators Notify the deficient BA marketers Notify other Balancing Authorities and Transmission Operators in its Reliability Coordinantor Area Order Load Shed - ✔✔Notify other Balancing Authorities and Transmission Operators in its Reliability Coordinantor Area A 500-MW generator trips in a Balancing Authority external to your Balancing Authority Area. Which of the following responses would you expect to see in your Area? Reduced net actual interchange. Reduced net generation on your system. Frequency above 60.00 Hz. Net Actual Interchange would be greater than Scheduled Interchange - ✔✔Net Actual Interchange would be greater than Scheduled Interchange A Reliability Coordinator receives notification from a Balancing Authority within its Reliability Coordinator area that the BA is experiencing a potential Energy Emergency. The RC shall initiate the Energy Emergency Alert (EEA) process as detailed in Attachment 1-EOP-001, Energy Emergency Alerts. What actions would the Reliability Coordinator coordinate with other Reliability Coordinators that have available resources?