Energy monitoring system for a plurality of local stations with snapshot polling from a central station
First Claim
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1. An energy monitoring system for determining individual electric power consumption used at a plurality of load stations each connected separately to a common main AC line system through individual circuit breakers and behind a collective electrical meter, comprising:
- a personal computer (PC) centrally located;
each load station including;
first analog means for sensing electrical voltages from said main AC line system to derive analog voltage signals;
second analog means for sensing electrical currents from said main AC line system to derive analog current signals;
analog-to-digital means for converting said voltage and current signals into digital voltage and current signals, respectively;
means for combining said digital voltage and current signals to generate a signal characteristic of an integrated representation of the energy consumed therewith;
bidirectional digital communication means being provided between said PC computer and said plurality of load stations for establishing a digital data highway therebetween; and
said bidirectional communication means being used at regular successive time intervals by said PC computer;
to initially and simultaneously address and command each load station to store the instantaneous value of the totalized energy consumed; and
to subsequently address and poll all stations individually and in turn with an individual command to transmit to the PC computer said stored value;
the PC computer establishing during a present time interval following a preceding time interval, and for each load station, the difference between successive such received instantaneous values of energy; and
the demand for the present time interval;
whereby the energy consumed and the demand at any load station are ascertained with said PC computer on each of said time intervals and individual billing in relation to the meter is effected regularly therefrom.
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Abstract
A PC computer monitors the energy consumed at a plurality of local stations placed behind the electrical meter of the utility company for individual billing of the local users, a bidirectional communication line being used therebetween. A command from the PC computer causes at each station the totalized energy to be stored, and thereafter the PC computer derives individually the results for separate estimations and central billing.
177 Citations
13 Claims
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1. An energy monitoring system for determining individual electric power consumption used at a plurality of load stations each connected separately to a common main AC line system through individual circuit breakers and behind a collective electrical meter, comprising:
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a personal computer (PC) centrally located; each load station including; first analog means for sensing electrical voltages from said main AC line system to derive analog voltage signals; second analog means for sensing electrical currents from said main AC line system to derive analog current signals; analog-to-digital means for converting said voltage and current signals into digital voltage and current signals, respectively; means for combining said digital voltage and current signals to generate a signal characteristic of an integrated representation of the energy consumed therewith; bidirectional digital communication means being provided between said PC computer and said plurality of load stations for establishing a digital data highway therebetween; and said bidirectional communication means being used at regular successive time intervals by said PC computer;
to initially and simultaneously address and command each load station to store the instantaneous value of the totalized energy consumed; and
to subsequently address and poll all stations individually and in turn with an individual command to transmit to the PC computer said stored value;
the PC computer establishing during a present time interval following a preceding time interval, and for each load station, the difference between successive such received instantaneous values of energy; and
the demand for the present time interval;whereby the energy consumed and the demand at any load station are ascertained with said PC computer on each of said time intervals and individual billing in relation to the meter is effected regularly therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification