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Electrical Technology, Vol2: Machines and Measurements, 1/e by S. P. Bali

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51

Watt Meters and Energy Meters

OBJECTIVES

In this chapter you will learn about:

  • The difference between ampere meters, watt meters, ampere-hour meters and watt-hour meters
  • Electrodynamic (dynamometer) and induction-type watt meters
  • The construction and principle of operation of watt meters
  • Energy meters—both commutator type and mercury type
  • The essential parts of induction watt-hour meters
  • The significance of the different parts
  • Production of fluxes and driving torque
  • Reading watt-hour meter
  • Poly-phase induction watt-hour meters
  • Errors in energy meters
  • Different methods of measuring power in three-phase circuits
  • Simple problems on the above

Watthour meter

51.1  INTRODUCTION

The measurement of electricity distributed for commercial purposes ...

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