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Kh
- Watt hour constant
- The value of 1 revolution of the meter disk, Expressed in watt hours.
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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.
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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."
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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.
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Kr
- Register Constant or Multiplier
- Multiplier of the register, due to gearing.
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TF
- Transformer Factor
- Multiplier of the register, due to CT’s and/or CT X PT ratios.
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Full Scale Formula
(Dual range & Solid State)
- E x I x CC x TF
- 1000
- (I = Class of meter)
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Drive
A Potential-Flux and a Current-Flux, acting on a disk, in a time and space displacement.
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Test Amps
Amperage used with line voltage to set the speed of the disk in 1 hour’s time. (1000Rph 1f) (500Rph Poly f)
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Demand
The average rate of consumption over a specific period of time
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Calibrating Constant
- The inverse of the number of current circuits in series under test.
- (Establishes the Kh of individual elements)
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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
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DATA PULSES
Output pulses (KYZ) generated by the electric meter for use by the Customer.
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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.
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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.
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RESIDENTIAL METERING
Metering of services used for the exclusive use of the individual customer for domestic purposes.
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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.
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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.
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GE Full Scale Formula
166 2/3 X CL
- Rr
- Register Multipliers- 1,2,4
- classes of register 1,2,6
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Pulse Demand Formula
- Ke x intervals of hour x max pulses
- 1000
= KW demand
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Watts Formula
- Kh x 3600 x revs
- Time in seconds
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VOLTAGE UNBALANCE
Maximum voltage deviation from average voltage.
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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.
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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.
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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.
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MEANS OF ATTACHMENT
Fittings used to attach service-drop conductors.(Screw knob, clevice, etc)
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Service
The furnishing of electric energy for the exclusive use of the individual customer.
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Service Drop
The overhead service conductors from the last distribution pole to and including the splices connecting to the service-entrance conductors.
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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.
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SERVICE LATERAL
The underground service conductors between the Company secondary transformer terminals and the connection to the service-entrance conductors.
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Primary Metering
Metering of service voltages above 480V nominal.
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Power Factor
The efficiency of a circuit.
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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).
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Contractor
Any person, company or corporation acting under contractual agreements for either the Company or for the customer.
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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.
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Instrument Transformer
A transformer that reproduces in its secondary circuit, the voltage or current proportional to its primary circuit.
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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.
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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)
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Meter Parts
Base, Cover, Perm Mag, Stator, Register, Disk
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EM Functions
Drive, drag, lag, Record
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SS Functions
Sample, Calculate, Convert, Display
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Demand meters must:
- Count disk revs,
- Display in KWH
- Count disk revs
- Display in KW
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SC meter
Doesn't require CTs or PTs. Connected directly to the supply source in series with customer load
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TR meter
Requires cts or pts, connected to secondaries of IT to isolate current and/or voltage
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% of accuracy formula
calc/observed x 100
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amps formula
- demand x 1000
- cc x applied voltage
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demand types
rolling, block, thermal, cumulative
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