Free sample: 1 of 30
Answer it before you open the explanation. On the exam there's no explanation, and you have about 77 seconds a question on RC and BT, 90 on TO and BI.
A 230 kV line flow has read exactly 214 MW for 20 minutes, while the flow and voltage points telemetered from the far end of the same line keep moving with load. What does this most likely indicate?
- A. The far-end meter has drifted out of calibration
- B. The flow is held by a Remedial Action Scheme
- C. The point is stale and the link has stopped updating it
- D. The load in that area has been constant for 20 minutes
Show the answer
Answer C The point is stale and the link has stopped updating it
A value frozen to the digit while the matching measurement at the other end of the same line keeps changing is a telemetry failure, not a system condition: the remote terminal unit or its communications path has stopped answering the scan, and the display is holding the last value received, normally with a quality flag. Calibration drift offsets a reading rather than freezing it, and constant load cannot move one end of a line without moving the other.
Reference: Control-room operating practice
