Method for determining a power consumption in an electric installation and alternating current electric installation

摘要

A group including a plurality of individual distribution branches connected in parallel is connected to an alternating-current power supply. A method includes: a) detection of a change in the electrical consumption of one specific branch among the branches; and b) determination of individual power consumption of the specific branch, based on a measurement of the total voltage, which is substantially constant during the change, measurements of intensity and phase shift values of the total current before and after the change, and measurements of intensities of individual current in the specific branch before and after the change.

主权项

1. A method for determining a power consumption in an electrical installation, wherein a plurality of distribution branches connected in parallel is connected to an alternating current power supply, the method comprising:
measuring and recording an overall supply voltage of the group of plural plurality of distribution branches, and measuring and recording first intensity and first phase shift values of an overall supply current of the plurality of distribution branches; measuring and recording a first intensity of a specific individual current flowing in a specific branch among the plurality of distribution branches, the first intensity of the specific individual current being measured from a current sensor located in the specific branch; detecting a change in the power consumption, the change affecting the first intensity of the specific individual current flowing in the specific branch; determining, by circuitry, whether the change is greater than a predetermined threshold; measuring and recording, when the change is greater than the predetermined threshold, second intensity and second phase shift values of the overall supply current of the plurality of distribution branches after the change; measuring and recording, when the change is greater than the predetermined threshold, a second intensity of the specific individual current flowing in the specific branch after the change, the second intensity of the specific individual current being measured from the current sensor, and determining, by the circuitry based on the measuring of the overall supply voltage the measuring of the first intensity and first phase shift values of the overall supply current before the change and the measuring of the second intensity and second phase shift values of the overall supply current after the change, and the measuring of the first intensity of the specific individual current before the change and the measuring of the second intensity of the specific individual current after the change, an individual power consumption in the specific branch.