breakout review

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electric
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230468
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breakout review
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2013-08-19 16:03:17
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Breakout review
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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. Full Scale Formula
    (Dual range & Solid State)

    • E x I x CC x TF
    • 1000
    • (I = Class of meter)
  8. Drive
    A Potential-Flux and a Current-Flux, acting on a disk, in a time and space displacement.
  9. Test Amps
    Amperage used with line voltage to set the speed of the disk in 1 hour’s time. (1000Rph 1f) (500Rph Poly f)
  10. Demand
    The average rate of consumption over a specific period of time
  11. Calibrating Constant
    • The inverse of the number of current circuits in series under test.
    • (Establishes the Kh of individual elements)
  12. List 3 rules of a right triangle
    • -Must contain a 90 degree angle
    • -All 3 angles must = 180 degrees
    • -Hypotenuse is always the longest side, always C
    • -Reference angle establishes the adjacent
  13. DATA PULSES
    Output pulses (KYZ) generated by the electric meter for use by the Customer.
  14. SERVICE RISER
    The service riser is the conduit containing the service-entrance conductors where the point of attachment and the connection between the service drop and the service-entrance conductors is located on a pole or below the roofline of the building being served. The conduit extends to a point, and the weather head is located, below the roof eave. The means of attachment is secured to the pole or building and is not attached to the service riser.
  15. VOLTAGE TRANSFORMER
    An instrument transformer intended for use in the measurement or control of a circuit and designed to have its primary winding connected in parallel with the circuit.
  16. RESIDENTIAL METERING
    Metering of services used for the exclusive use of the individual customer for domestic purposes.
  17. SECONDARY CONDUCTORS
    That part of the Company's distribution system, which connects the secondaries of the Company’s distribution transformers to the service drop or service lateral.
  18. 4 Steps to a 3W to 2W FM2 Conversion
    • -Open Pot clip after the pot coil and ground in meter housing. (bottom of pot coil)
    • -Ground System Neutral in Meter Housing
    • -Move the Customer load wire to where the System Neutral was.
    • -Insert a jumper capable of handling the customer load on the load side meter terminals.
  19. GE Full Scale Formula
    166 2/3 X CL

    • Rr
    • Register Multipliers- 1,2,4
    • classes of register 1,2,6
  20. Pulse Demand Formula
    • Ke x intervals of hour x max pulses
    • 1000

    = KW demand
  21. Register Ratio Formula
    • 10,000 x Kr
    • TFxKhxRs
  22. Watts Formula
    • Kh x 3600 x revs
    • Time in seconds
  23. VOLTAGE UNBALANCE
    Maximum voltage deviation from average voltage.
  24. CONDUIT or DUCT
    Standard tubular material used for mechanical protection of electrical systems which may be exposed, buried beneath the surface of the ground, or encased in a building structure as required.
  25. METER/METERING EQUIPMENT
    The equipment necessary to measure the customer’s electric energy use and demand including meter socket, instrument transformers, protective device and meter.
  26. MULTIPLE METER CENTER
    A pre-assembled multiple metering unit or fabricated meter center using meter sockets where two or more customers are metered at a common location.
  27. MEANS OF ATTACHMENT
    Fittings used to attach service-drop conductors.(Screw knob, clevice, etc)
  28. Service
    The furnishing of electric energy for the exclusive use of the individual customer.
  29. Service Drop
    The overhead service conductors from the last distribution pole to and including the splices connecting to the service-entrance conductors.
  30. Service Equipment
    a circuit breaker or fuseable disconnect switch, intended to constitute the main control and means of cutoff for the supply to that building.
  31. SERVICE LATERAL
    The underground service conductors between the Company secondary transformer terminals and the connection to the service-entrance conductors.
  32. Primary Metering
    Metering of service voltages above 480V nominal.
  33. Power Factor
    The efficiency of a circuit.
  34. Altered
    Replacing major components of a meter socket, current transformer cabinet, riser, mast, line or load side conductor, relocating electric service equipment, (including storm damage).
  35. Contractor
    Any person, company or corporation acting under contractual agreements for either the Company or for the customer.
  36. Duct (conduit)
    Standard tubular material used for mechanical protection of electrical systems which may be exposed, buried beneath the ground, or encased in a building structure as required.
  37. Instrument Transformer
    A transformer that reproduces in its secondary circuit, the voltage or current proportional to its primary circuit.
  38. Service Entrance Conductors (UG)
    The service conductors between the terminals of the customer's service equipment and the point of connection to the service lateral.
  39. What is the difference between True and Apparent power?
    • True = E x I x cosine theta
    • Apparent = E x I
    • (415 vs 480 for example)
  40. Meter Parts
    Base, Cover, Perm Mag, Stator, Register, Disk
  41. EM Functions
    Drive, drag, lag, Record
  42. SS Functions
    Sample, Calculate, Convert, Display
  43. Demand meters must:
    • Count disk revs,
    • Display in KWH
    • Count disk revs
    • Display in KW
  44. SC meter
    Doesn't require CTs or PTs. Connected directly to the supply source in series with customer load
  45. TR meter
    Requires cts or pts, connected to secondaries of IT to isolate current and/or voltage
  46. % of accuracy formula
    calc/observed x 100
  47. amps formula
    • demand x 1000
    • cc x applied voltage
  48. demand types
    rolling, block, thermal, cumulative

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