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This refers to the electronic collection of the energy values
registered by electricity meters and is particularly applicable
to high accuracy and large energy consumption applications.
Active and reactive energy meters produce pulses, each representing
a quantity of energy. The number of pulses counted in, say, 30
minutes is a metered amount of energy known as a half-hour demand.
Outstations connected to the meters provide the means of logging
these cumulative demand values and have the ability to retain
that information in memory until such time as it is collected
by a central computer or remote collector station.
In addition, outstations can be used to log pulses produced
by other types of metering equipment such as steam energy meters
or gas flow meters. |