2nd Step written (2016)

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electric
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310317
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2nd Step written (2016)
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2016-01-05 11:09:26
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Xcel 2nd step written
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2nd step written
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  1. Kh
    • Watt hour constant
    • The value of 1 revolution of the meter disk, Expressed in watt hours.
  2. Rr
    • Register Ratio
    • The number of turns of the 1st gear of the register to cause the 1st (or right hand) dial pointer to complete 1 full revolution which = 10,000 watt hours or 10kwhrs.
  3. Rg
    • Gear Ratio
    • The number of turns of the meter disk to cause the 1st (or right hand) dial pointer to complete 1 full revolution = 10,000 watt hrs or 10kwhrs.
  4. Rs
    • Reduction at Shaft
    • The ratio between the number of teeth on the 1st gear of the register to the number of entries on the disk shaft.
  5. Kr
    • Register Constant or Multiplier
    • Multiplier of the register, due to gearing.
  6. TF
    • Transformer Factor
    • Multiplier of the register, due to CT’s and/or CT X PT ratios.
  7. Test Amps
    Amperage used with line voltage to set the speed of the disk in 1 hour’s time. (1000Rph 1phase) (500Rph Poly phase)
  8. PKh
    Watt-hour Constant x Transformer Factor
  9. Demand
    The average rate of consumption over a specific period of time
  10. Calibrating Constant
    The inverse of the number of current circuits in series under test.

    (Establishes the Kh of individual elements)
  11. Power
    An electrical load expressed in watts or kilowatts without a relationship to time. E x I=Watts
  12. Energy
    An electrical load expressed in watts or kilowatts times the number of hours it’s used.

    E x I x time factor = Kwhr
  13. Stator (Meter Element)
    The unit that provides the driving torque in a watt-hour meter. It includes the Potential-Coil, the Current-Coil and the related framework to provide a magnetic flux or path
  14. Blondel's Theorum
    In a system of N-conductors, N-1 metering elements properly connected, will measure power and/or energy consumed, provided that all potential coil(s) have a common connection in which no current circuit(s) are connected.
  15. Test Amps Formula
    • E x I x CC x TF
    • 1,000 Rph for single phase
    • 500 Rph for Polyphase
  16. Register Ratio Formula
    • 10,000 x Kr
    • TFxKhxRs
  17. Watts Formula
    • Kh x 3600 x revs
    • Time in seconds
  18. Kh Formula
    • 10,000 x Kr
    • TF X Rr x Rs
  19. Rs Formula
    • 10,000 x Kr
    • TF x Kh x Rr
  20. Rg Formula
    Rr x Rs
  21. Kr Formula
    • Kh x Rr x Rs x TF
    •        10,000
  22. Power Formula
    Volts x Amperes  (or)  E x I
  23. Energy Formula
    Volts x Amperes x Time  (or)  E x I x Time
  24. Demand Formula
    • E x I x CCx TF                                                      1000                                         
    • where “I” is equal to the amperage
    • on the meter under test
  25. Draw and label a FM5, FM6, FM8 and FM9 socket and a-base meter
  26. Draw the following meter banks and the corresponding meters (a-base and socket) for each bank:
    • 4W3phase wye
    • 3W3phase open delta
    • 4W3phase closed delta
  27. Draw and connect a FM1 socket Preferred, Non-preferred, and set on neutral
  28. What is an Ohm?
    The practical unit of electric resistance.
  29. Define Percent Registration
    The ratio of the actual registration of the meter to the value of the quantity measured in a given time, expressed as a percentage
  30. What is capacitance?
    The property of an electric circuit which allows storage of energy and exists whenever two conductors are in the close proximity but separated by an insulator or dielectric material
  31. What is conductance?
    The ability of a substance or body to pass an electric current
  32. Define Detent
    A device installed in a meter to prevent reverse rotation of the meter disk
  33. What is a demand register?
    A mechanism that indicates maximum demand and also registers energy used
  34. What is a cycle?
    One complete set of positive and negative values of an alternating current or voltage
  35. Define Volt
    The practical unit of electromotive force, or potential difference
  36. Form Designation
    The industry wide standard to describe the meter construction and wiring.
  37. Transformer Factor Formula
    • TF =  10,000 x Kr
    •         Kh x Rr x Rs
    • (or)

    CTRxPTR
  38. What is the KW demand on an Itron Sentinal FM9 with 6000 internal pulses? Show work
    3.6KW
  39. How many internal pulses are on an Itron FM16 with a demand of 36KW?  Show work
    5000 pulses
  40. Be able to calculate watts, TF and PKh  with values provided.
  41. Prove Voltages on both Delta and Wye services using Trigonometry
  42. Misapplication of a FM2 on a Wye bank. Draw and explain. Also  what % the meter registers vs customer uses on phase to phase loads and phase to neutral loads.
    Refer to Vector Class Powerpoint pg 8-9
  43. Draw and explain a FM12 where the 5th terminal is not connected to ground.
    Also  what % the meter registers vs customer uses on phase to phase loads and phase to neutral loads.
    Refer to Vector class powerpoint pg 14

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