US Patent No. 9,817,419

METHOD FOR DETERMINING AN INDIVIDUAL POWER CONSUMPTION


Patent No. 9,817,419
Issue Date November 14, 2017
Title Method For Determining An Individual Power Consumption
Inventorship Marc Bruel, Corenc (FR)
Assignee SCHNEIDER ELECTRIC INDUSTRIES SAS, Rueil-Malmaison (FR)

Claim of US Patent No. 9,817,419

1. Method of determining an individual power consumption in an electric installation comprising a group of individual electric
power distribution branches and a main upstream line connecting the group of branches to an electric power supply, each individual
electric power distribution branch comprising a circuit breaker, the method comprising the steps of:
a) measuring the current flowing in the main upstream line and the voltage of the main upstream line;
b) measuring the voltage of at least one individual distribution branch, downstream of the circuit breaker;
c) determining the current flowing in the individual distribution branch based on the difference between the voltage of the
main upstream line and the voltage of the individual distribution branch;

d) calculating the individual power consumption of the individual distribution branch based on the current and on the voltage
of the individual distribution branch;

e) calculating the general power consumed by the group of branches based on the current and on the voltage of the main upstream
line; and

f) correcting the individual power consumption so that an instantaneous electric power consumption variation observed at the
level of the individual distribution branch is equal to an instantaneous electric power consumption variation simultaneously
observed at the level of the main upstream line,

wherein step f) includes the sub-steps of:
assigning an individual correction coefficient to the individual power consumption,
simultaneously detecting a variation of the corrected individual power consumption and a variation of the general power,
calculating a calibration coefficient equal to the ratio between the variations of the individual power consumption and of
the general power,

updating the individual correction coefficient using the calibration coefficient, and
assigning the individual correction coefficient to the individual power consumption.