Patent ID: 9291694
Filing Date: 2016-03-22
CPC Classification: G01R

Claim Text:
1. A method comprising: using an electrical sensor device, determining a first current measurement of a first current in an electrical power infrastructure of a building and a first phase angle measurement of the first current, wherein the electrical sensor device is coupled to a first surface of a circuit breaker box, the circuit breaker box is overlying the electrical power infrastructure of the building, and the electrical sensor device comprises two or more electrical current sensors; determining that a first load is coupled to the electrical power infrastructure; while the first load is coupled to the electrical power infrastructure, determining a second current measurement of a second current in the electrical power infrastructure and a second phase angle measurement of the second current; and using a Kalman filter to determine one or more first calibration coefficients for the electrical sensor device at least in part using the first current measurement, the second current measurement, the first phase angle measurement, and the second phase angle measurement; wherein: the first phase angle measurement of the first current is relative to a phase of a first voltage drop across the electrical power infrastructure of the building; and the second phase angle measurement of the second current is relative to a phase of a second voltage drop across the electrical power infrastructure of the building.