1st Step Written (2016)

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electric
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1st Step Written (2016)
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2016-07-11 10:53:18
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1st Step Written 2016
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  1. Define Kh
    • Watt hour constant
    • The value of 1 revolution of the meter disk, Expressed in watt hours.
  2. Define 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. Define 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. Define 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. Define Kr
    • Register Constant or Multiplier
    • Multiplier of the register, due to gearing.
  6. Define TF
    • Transformer Factor
    • Multiplier of the register, due to CT’s and/or CT X PT ratios.
  7. Define Drive
    A Potential-Flux and a Current-Flux, acting on a disk, in a time and space displacement.
  8. Define Drag
    A permanent magnet calibrated at the factory, with the known voltage and amperage to set the speed of the disk.
  9. Define Lag
    Potential-Flux must lag Current-Flux by exactly 90 electrical degrees at unity power factor to establish max torque of the disk at any given load power factor.
  10. Define Record
    A kilowatt-hour register, counting disk revolutions, displaying them in kilowatt-hours, accomplished at reduction at shaft
  11. Define Form
    Industry standard to describe the meter
  12. Define Test Amps
    Amperage used with line voltage to set the speed of the disk in 1 hour’s time. (1000Rph 1phase) (500Rph Poly phase)
  13. Define Class
    Rated amperage a meter can continuously handle per phase, provided the meter housing and wiring are adequate
  14. List the 6 parts of an Electro-Mechanical Meter
    Base, Meter Disk, Kilowatt Hour Register, Permanent Magnet, Stator, Cover
  15. List the 3 major meter types
    • A Base-electromechanical
    • Socket-electromechanical
    • Socket-Solid state
  16. List the 6 major parts of a Solid State meter.
    • Base
    • Cover
    • Digital Display
    • CT's or Hall Effect Pickups
    • Circuit Board
    • Current Coils
  17. What are the 4 basic EM meter functions?
    Drive, Drag, Lag, Record
  18. Define Test Amps
    Amperage used with line voltage to set the speed of the disk in 1 hour’s time. (1000Rph 1phase) (500Rph Poly phase)
  19. Define PKh
    Primary Watt-hour Constant

    The Watt-hour Constant
    x Transformer Factor
  20. Define Demand
    The average rate of consumption over a specific period of time
  21. Define Calibrating Constant
    The inverse of the number of current circuits in series under test.

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

    E x I x time factor = Kwhr
  24. Define 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
  25. 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.
  26. Test Amps Formula
    • E x I x CC x TF
    • 1,000 Rph for single phase
    • 500 Rph for Polyphase
  27. Register Ratio Formula
    • 10,000 x Kr
    • TFxKhxRs
  28. Watts Formula
    • Kh x 3600 x revs
    • Time in seconds
  29. Kh Formula
    • 10,000 x Kr
    • TF X Rr x Rs
  30. Rs Formula
    • 10,000 x Kr
    • TF x Kh x Rr
  31. Rg Formula
    Rr x Rs
  32. Kr Formula
    • Kh x Rr x Rs x TF
    •        10,000
  33. Power Formula
    Volts x Amperes  (or)  E x I
  34. Energy Formula
    Volts x Amperes x Time  (or)  E x I x Time
  35. Demand Formula
    • E x I x CCx TF                                                      1000                                         
    • where “I” is equal to the amperage
    • on the meter under test
  36. Draw a single phase delta bank and secondary lines
  37. Draw and connect FM1/FM2/FM12 meters abase and socket
  38. Form Designation
    The industry wide standard to describe the meter construction and wiring.
  39. Transformer Factor Formula
    • TF =  10,000 x Kr
    •         Kh x Rr x Rs
    • (or)

    CT ratio x PT ratio = TF
  40. List the 4 basic Solid State meter functions
    • Sample
    • Calculate
    • Convert
    • Display
  41. Define Sample
    Sample: samples current & voltage at the CTs and meter stabs
  42. Define Calculate
    Calculate: Multiplies current & voltage in phase to calculate watts being used
  43. Define Convert
    Converts data into a digital signal to be sent to the digital display
  44. Define Display
    Displays consumption in Kwhrs or KW for billing purposes
  45. Define Current Circuits (CC)
    The number of current circuits in series under test
  46. Define A-Base Meter
    An electromechanical meter where the line and load side conductors are physically connected to the bottom of the meter
  47. Define Socket Type Meter
    A meter designed to plug into a pre-existing, pre-wired meter housing designed for the meter type and load.
  48. Define Creep
    With applied voltage only, the meter disk makes 1 full revolution either forwards or backwards in 10 minutes or less.
  49. Network System
    2 hots and a neutral connected to a wye system
  50. Define Detent
    A mechanical or solid state device used to prevent reverse rotation of the meter disk
  51. Be able to use all formulas to solve equations.
  52. What is a segment check?
    Every pixel is lit up at once to test full functionality of the display
  53. Ohm's Law
    E=I x R
  54. Pythagorean's Theorem
    a2 + b2 = c2
  55. Define ERT
    Encoder, Receiver, Transmitter
  56. Be able to explain a customers electrical use vs what the meter measures on a FM1 & FM2

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