an electrical energy meter is not isolated and switch current sensor circuit

摘要

the invention relates to an electric meter for the measurement of a current and a phase voltage consumed by a user (3) with at least one stage of a power distribution network (1).with a measurement part (2) and a current sensor (rshunt) isolated in series to the driver stage for the measurement of voltage of phase i as a phn from my vmes the voltage at the terminals of the sensor, a first voltage divider (r4)r5) receiving input voltage and providing a measure of phase v phn upstream of a potential difference between a first potential of the driver stage and a second potential, and a cut-off switch (k1) in series with the current sensor.according to the invention, the metrology part (2) comprises a monitoring device, comprising a second voltage divider (r1, r2) connected in parallel with the set formed by the sensor (rshunt) and the cut-off switch (k1).a vphn downstream upstream which is representative of the potential difference between the conductive phase in the downstream of the cutoff switch (k1) and the driver stage upstream of the metering part.the various measures can be used to detect different situations (integrity of the pole of the switch power, fraud, a short circuit, self re activation of the downstream main switch) when the switch is open or closed.