2.5

  1. True/False

    The 4.8kv Distribution System is an ungrounded system
    True
  2. Ground detectors are fused on the                 leads
    primary
  3. True/False

    A grounded 4.8kV phase will raise the static phase-to-ground voltage of the remaining phases to 4.8kV or higher.
    True
  4. *When an ARC bypasses the insulators*
    Flashover
  5. The ground detector voltages, indicated on the ungrounded phases, will always                  when there is a true ground.
    increase
  6. True/False

    There will be no change on the bank voltmeters even though the
    ground detectors indicate there is a ground
    True
  7. True/False

    A high voltage ground can damage the ground detector associated with the phase that has gone high voltage
    True
  8. Whenever possible, restore any grounded feeder to its
    normal position to take advantage of the feeder's                  
    lower relay setting
  9. When the station's ground detectors are not working properly and an Electric Trouble Supervisor’s 10kV Meter is being used, the meter is applied to the                  of a feeder position with all feeder ARs blocked
    load side
  10. Why does the Patrolman connect the 10kv meter to the load side of the Fdrs
    By connecting the meter to the load side of the feeder CB, full feeder relay protection is available should a problem occur.
  11. A high voltage ground condition can only be
    confirmed with                  .
    metering
  12. True/False

    A 4.8kv ground does not affect circuits connected through banks to the 34.5kV system
    True
  13. True/False

    Before using the Transfer Bus, it must be electrically tested from an ungrounded source and checked free of grounds.
    True
  14. True/False

    Temporary bank overloads are permissible during ground searches.
    True
  15. True/False

    Under normal circumstances, it is not necessary, or desirable to isolate a grounded feeder on a bus and bank by itself. Doing so may cause a high voltage condition
    True
  16. During a 4.8kv Conventional grd search, what checks should be conducted on Fdrs
    Check all feeders for possible relay action, or low, unbalanced, or erratic current
  17. True/False

    Even if several feeders need to be transferred to the Transfer Bus, transfer them one at a time to minimize the effect of multiple parallel supplies during a fault.
    True
  18. When making parallel, do not parallel grounds of different phases, why is this important
    This may result in a short circuit and possible relay action
  19. True/False

    If a Fdr relay occurs on a grounded circuit, do not test the circuit until authorized to do so
    True
  20. Why do we restore the Fdr to its own position with normal relay protection
    The Transfer Bus relays are not as fast as the feeder relays since their settings are higher. Placing the feeder on its own position make any work on the feeder safer
  21. True/False

    A standard OK TO Work Hot cannot be issued unless the feeder has normal relay protection
    False
  22. When is it allowable to issue an OK TO Work Hot without normal relay protection
    When the Fdr has Bus Tie or TBT relay protection
Author
Benjammincash
ID
355291
Card Set
2.5
Description
4.8kV Grounds and Ground Search Procedures
Updated