Summary

This 44-minute DVD gives an overall view of electric metering, and an introduction to some of the main subject areas covered in detail in later units. The unit offers a brief history of electric energy measurement, including a simplified look at watthour meter construction and operating principles. Also presents a brief explanation of meter testing and calibration.

Training Sessions

• Basic Concepts of Metering – 8 minutes Identifies several early types of electro-mechanical watthour meters. Identifies the basic parts and describes the operating principles of a modern electro-mechanical watthour meter.
  
  
• Self-Contained Meter Application – 8 minutes Explains the difference between self-contained meters and transformer-rated meters. Lists and explains some of the information typically found on watthour meter nameplates. Identifies the characteristics of a typical three-phase delta service and a typical three-phase wye service.
  
  
• Transformer-Rated Meter Application – 8 minutes Explains how an instrument transformer is connected to a transformer-rated meter. Identify the two main classifications of instrument transformers. States the function of a test switch.
  
  
• Meter Testing – 10 minutes Describes the basic steps for conducting a comparison test on a single-phase watthour meter. Explains the function of a standard and describes how a standard is used to conduct accuracy tests.
  
  
• Meterman Responsibilities – 9 minutes Describes some of the tasks and responsibilities commonly associated with being a meterman. Shows some typical installation checks performed by metermen and explains how they are done. Identifies several forms of power theft.

Support Materials Available

Student workbook, instructor guide.