Quantcast Permanent Kilowatthour Meter

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2.2 Permanent Kilowatthour Meter.  A typical kilowatthour meter is shown in
Figure 9-8. Watthour meters are commonly known by the type of electrical
system for which they are designed , such as 3-wire single phase and 4-wire
delta or wye meters.  Basic characteristics of a typical kilowatthour meter
are as follows:
Configuration:  Kilowatthour meters are available to measure energy
consumption for all types of single and polyphase circuits.  Two types
of mountings are available:  hard-wired A-type meter and socket and
plug-in, S-type meter.  In addition to standard registers, three
options are available:  time-of-use register, demand register, and
pulse initiator.
Register: Totalized kilowatthours (kWh) are displayed either in a
four or five circular dial arrangement, or in digital form.
Range: Self-contained meters are designed for services of up to 200
amperes and 600 volts.  For higher voltages and currents, potential
and current transformers are required.  In many situations, for safety
considerations, a potential transformer (PT) is preferred when
voltages exceed 277 volts.
Accuracy: Utility companies usually specify an accuracy of2 percent
and conformance to American National Standards Institute (ANSI) c-12
series standards.
Kilowatthour Meter


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