1st Step Written (2016)

  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 Class
    Rated amperage a meter can handle continuously per phase, provided the meter housing and wiring are adequate
  13. List the 6 parts of an Electro-Mechanical Meter
    Base, Meter Disk, Kilowatt Hour Register, Permanent Magnet, Stator, Cover
  14. List the 3 major meter types
    • A Base-electromechanical
    • Socket-electromechanical
    • Socket-Solid state
  15. List the 6 major parts of a Solid State meter.
    • Base
    • Cover
    • Digital Display
    • CT's or Hall Effect Pickups
    • Circuit Board
    • Current Coils
  16. What are the 4 basic EM meter functions?
    Drive, Drag, Lag, Record
  17. 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)
  18. Define PKh
    Primary Watt-hour Constant

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

    (Establishes the Kh of individual elements)
  21. Define Power
    An electrical load expressed in watts or kilowatts without a relationship to time. E x I=Watts
  22. 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
  23. 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
  24. 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.
  25. Test Amps Formula
    • E x I x CC x TF
    • 1,000 Rph for single phase
    • 500 Rph for Polyphase
  26. Register Ratio Formula
    • 10,000 x Kr
    • TFxKhxRs
  27. Watts Formula
    • Kh x 3600 x revs
    • Time in seconds
  28. Kh Formula
    • 10,000 x Kr
    • TF X Rr x Rs
  29. Rs Formula
    • 10,000 x Kr
    • TF x Kh x Rr
  30. Rg Formula
    Rr x Rs
  31. Kr Formula
    • Kh x Rr x Rs x TF
    •        10,000
  32. Power Formula
    Volts x Amperes  (or)  E x I
  33. Energy Formula
    Volts x Amperes x Time  (or)  E x I x Time
  34. Demand Formula
    • E x I x CCx TF                                                      1000                                         
    • where “I” is equal to the amperage
    • on the meter under test
  35. Draw a single phase delta bank and secondary lines
  36. Draw and connect FM1/FM2/FM12 meters abase and socket
  37. Transformer Factor Formula
    • TF =  10,000 x Kr
    •         Kh x Rr x Rs
    • (or)

    CT ratio x PT ratio = TF
  38. List the 4 basic Solid State meter functions
    • Sample
    • Calculate
    • Convert
    • Display
  39. Define Sample
    Sample: samples current & voltage at the CTs and meter stabs
  40. Define Calculate
    Calculate: Multiplies current & voltage in phase to calculate watts being used
  41. Define Convert
    Converts data into a digital signal to be sent to the digital display
  42. Define Display
    Displays consumption in Kwhrs or KW for billing purposes
  43. Define Current Circuits (CC)
    The number of current circuits in series under test
  44. Define A-Base Meter
    An electromechanical meter where the line and load side conductors are physically connected to the bottom of the meter
  45. Define Socket Type Meter
    A Socket meter is an electromechanical meter in which the meter is designed to plug into a pre-existing meter socket / housing where all the line and load conductors are wired to the internal socket.
  46. Define Creep
    With applied voltage only, the meter disk makes 1 full revolution either forwards or backwards in 10 minutes or less.
  47. Network System
    2 hots and a neutral connected to a wye system
  48. Define Detent
    A mechanical or solid state device used to prevent reverse rotation of the meter disk
  49. Be able to use all formulas to solve equations.
  50. What is a segment check?
    Every pixel is lit up at once to test full functionality of the display
  51. Ohm's Law
    E=I x R
  52. Pythagorean's Theorem
    a2 + b2 = c2
  53. Define ERT
    Encoder, Receiver, Transmitter
  54. Be able to explain a customers electrical use vs what the meter measures on a FM1 & FM2
Author
electric
ID
244310
Card Set
1st Step Written (2016)
Description
1st Step Written 2016
Updated