ELECTRIC ENERGY METER WITH NON-INSULATED CURRENT SENSOR AND CUT-OFF SWITCH

摘要

The invention relates to an electric meter for measuring a current and a phase voltage consumed by a user (3) on at least one phase n of an electrical distribution network (1), comprising a metrological part ( 2) with a current sensor (R) not isolated in series on the phase conductor n for the measurement of the phase current I from a measurement V of the potential difference across the sensor, a first voltage divider (R4, R5) receiving as input the phase voltage and delivering a measurement V of a potential difference between a first potential given by the phase conductor and a second potential, and a breaking contactor (K1) in series with the current sensor. According to the invention, the metrological part (2) comprises a monitoring device comprising a second voltage divider (R1, R2) connected in parallel to the series assembly formed by the sensor (R) and the breaking contactor (k1). , delivering a measurement V representative of the potential difference between the phase conductor downstream of the breaking contactor (K1) and the phase conductor upstream of the metrological part. The different measurements can be used to detect different situations (Integrity of the breaker contact pole, Short-circuit fault, downstream autoproduction, re-engagement of the main circuit-breaker) when the contactor is open or closed.