METERING FOR LINEMEN

 

Electrical Metering for Linemen and Techicians

 

Table of Contents

Basic Mechanical Meter Parts

    Base
    Cover
    Frame
    Potential Coil
    Current Coil
    Disk or Rotor
    Damping Magnet
    Stator
    Register
    Potential Lights
    Detent

Blondel's Theorem

Nameplate Meter Information
    Frequency (60Hz)
    Number of Wires
    Voltage Rating
    Test Amp (TA) Rating
    Class
    Kh
    Type
    Form
    Serial Number
    Catalog Number

Self-Contained vs. Instrument-Rated Meters
    Self-Contained Meters
    Instrument-Rated Meters

Voltage Transformers
    Purpose
    Ratio
    Polarity
    Accuracy
    Burden Rating

Current Transformers
    Purpose
    Ratio
    Transformer Factor (TF)
    Rating Factor (RF)
    Type
    Polarity
    Accuracy
    Burden Rating
    Shorting Bars, Self-Shorting Devices, & Test Switches

Color Coded Wiring for Instrument Transformers
    Polarity
    Phase Relationships
    Color Codes
    Factory Pre-Wired Meter Sockets
    Separate Current Circuit Return Paths
    Single Point Grounding

Dial Multipliers
    Self-Contained Meters
    Instrument-Rated Meters
    Universal Mechanical Registers
    Hybrid Meters
    Solid State Meters

Calculating Single Phase Amps
    
Purpose
    Rule of Thumb
    Never Add Amps!
    Metering Equipment & Transformer Sizing

Calculating Three Phase Amps
    Purpose
    Rule of Thumb
    Open Delta Transformer Secondary
    Never Add Amps!
    Metering Equipment & Transformer Sizing

Power Factor
    Resistive Load
    Inductive (Motor) Load
    Capacitors (Power Factor Correction)

Demand & Demand Registers

Determining Present Load, Power Factor, & Horsepower
    Purpose
    Determining Present Load & Power Factor (Self-Contained Meter)
    Determining Present Load, Power Factor, & Horsepower (Self-Contained Meter)
    Determining Present Load, Power Factor, & Horsepower (Instrument-Rated Meter)

Reference Data
    Purpose
    Electrical Term Abbreviations
    Metering Terminology Abbreviations
    Shaft Reduction (Rs) Table
    Meter Forms

Self-Contained Metering Diagrams & Narratives
*Each metering diagram is accompanied by a narrative that includes "Purpose", "Key Points for Metering", and "Common Mistakes"

Single Phase 2 Wire 120V - Form 1S
Single Phase 2 Wire 120V - Form 2S (Alternate 1)
Single Phase 2 Wire 120V - Form 2S (Alternate 2)
Single Phase 3 Wire 120/240V - Form 2S
Single Phase 3 Wire 120/208 Network - Form 12S
Three Phase 3 Wire 240V Delta - Form 12S
Three Phase 4 Wire 120/240V Delta - Form 15S
Three Phase 4 Wire 120/208 Wye - Form 14S
Three Phase 4 Wire 120/208 Wye - Form 16S

Instrument-Rated Metering Diagrams & Narratives
*Each metering diagram is accompanied by a narrative that includes "Purpose", "Key Points for Metering", and "Common Mistakes"

Single Phase 2 Wire 480V - Form 3S
Single Phase 3 Wire 120/240V - Form 3S
Single Phase 3 Wire 120/240V - Form 4S
Three Phase 3 Wire 240V Delta - Form 5S
Three Phase 3 Wire 480V Delta - Form 5S
Three Phase 4 Wire 120/240V Delta - Form 8S
Three Phase 4 Wire 120/240V Delta - Form 5S
Three Phase 4 Wire 120/208V Wye - Form 6S
Three Phase 4 Wire 277/480V Wye - Form 6S
Three Phase 4 Wire 120/208V Wye - Form 9S
Three Phase 4 Wire 277/480V Wye - Form 9S
Three Phase 4 Wire 120/208V Wye - Form 5S

Primary Metering
Three Phase 3 Wire Delta - Form 5S
Three Phase 4 Wire Wye - Form 9S