Three Phase Meters
Power stations supply three-
Large buildings, shopping centres, factories, office blocks, and multiple-
The most important class of a three-
Large rectifier systems may have three-
Three phase electricity is a smoother form of electricity than single-
At the power station, an electrical generator converts mechanical power into a set of alternating electric currents, one from each electromagnetic coil or winding of the generator. The currents are sinusoidal functions of time, all at the same frequency but with different phases. In a three-
The currents in each conductor reach their peak instantaneous values sequentially, not simultaneously; in each cycle of the power frequency, first one, then the second, then the third current reaches its maximum value. The waveforms of the three supply conductors are offset from one another in time (delayed in phase) by one-
Three phase has properties that make it very desirable in electric power systems. Such as: The phase currents tend to cancel one another (summing to zero in the case of a linear balanced load). This makes it possible to eliminate the neutral conductor on some lines; Power transfer into a linear balanced load is constant, which helps to reduce generator and motor vibrations; Three-
Three phase systems may or may not have a neutral wire. A neutral wire allows the three phase system to use a higher voltage while still supporting lower voltage single phase appliances. In high voltage distribution situations it is common not to have a neutral wire as the loads can simply be connected between phases (phase-
In places using a 415 volt 3 phase system, the phase-
Single Phase Meters
such as lighting and heating.
of the supply vary in unison.
household supply may be rated 100 Amps to 125 Amps. This may mean that there is little need for 3
phase electricity in a domestic or small commercial environment.
Typical Features of Single Phase Meters Single Phase Meter
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