Electrical energy meter of a current sensor is not isolated and cut-off switch

摘要

The present invention relates to an electric meter for measuring a current and voltage of phase consumed by a user (3) over at least one phase of an electrical distribution network (1), comprising a metrological part (2) with a current sensor (r) is not isolated in series on the phase conductor n for the measurement of the phase current i from a measurement of the potential difference across the terminals of the sensor, a first voltage divider (r4, r5) receiving as input the voltage of phase and delivering a measurement of a potential difference between a first voltage given by the phase conductor and a second potential, and a cut-off switch (k1) in series with the current sensor. According to the invention, the measuring part (2) comprises a monitoring device comprising a second voltage divider (r1, r2) connected in parallel on the serial assembly formed by the sensor (r) and the cut-off switch (k1), delivering a measurement v representative of the potential difference between the phase conductor downstream of the contactor breaker (k1) and the phase conductor upstream of the measuring part. The various measurements may be used to detect different situations (integrity of the pole of the contactor of fraud by short - circuit, downstream autoproduction, engagement of the main circuit breaker) when the switch is open or closed.