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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