Abstract: A system for calibrating voltage measurements in a system for measuring electrical quantities includes a calibration device configured to determine a first reference time instant of a zero-crossing event of a voltage signal that it measures, and transmit a calibration message including the first reference time instant and a measured voltage amplitude value to at least one device for measuring electrical quantities. The at least one device for measuring electrical quantities is configured to receive the calibration message, extract the first reference time instant and the voltage amplitude, determine a second reference time instant, of zero crossing of the voltage signal measured locally, corresponding to the first reference instant, calculate a phase shift of the locally-measured voltage signal, as a function of the difference between the first and the second reference time instants and apply a phase and amplitude voltage calibration as a function of the voltage amplitude and of the phase shift.

Abstract: A device for measuring electrical quantities in an electrical installation. The device is integrated in a housing including at least one unitary block, the unitary block including a through-slot suitable for receiving an electrical conductor of the electrical installation, the through-slot extending along a main axis. Each unitary block includes: a current measurement module, configured to measure an electrical current flowing in the electrical conductor; a voltage measurement module for measuring voltage through capacitive coupling; and a power supply module, configured to pick up an electrical energy from the electrical conductor, the modules being arranged around the through-slot. The device is configured to obtain at least one electrical quantity on the basis of the current and voltage measurements, and to transmit the at least one electrical quantity via a communication interface.

Abstract: A system for calibrating voltage measurements in a system for measuring electrical quantities includes a calibration device configured to determine a first reference time instant of a zero-crossing event of a voltage signal that it measures, and transmit a calibration message including the first reference time instant and a measured voltage amplitude value to at least one device for measuring electrical quantities. The at least one device for measuring electrical quantities is configured to receive the calibration message, extract the first reference time instant and the voltage amplitude, determine a second reference time instant, of zero crossing of the voltage signal measured locally, corresponding to the first reference instant, calculate a phase shift of the locally-measured voltage signal, as a function of the difference between the first and the second reference time instants and apply a phase and amplitude voltage calibration as a function of the voltage amplitude and of the phase shift.