| 摘要 |
The invention relates to an electricity meter for measuring a phase current and a voltage which are used by a user (3) over at least one phase n of an electric power distribution network (1), comprising a metrology portion (2) with an uninsulated current sensor (Rshunt) in series on the phase n conductor for measuring the current of phase Iphn from a measurement mes Vmes of the difference in potential at the terminals of the sensor, a first voltage divider (R4, R5) receiving the phase voltage as an input and outputting a measurement Vphn upstream of a difference in potentials between a first potential given by the conductor and a second potential, and a cutoff contactor (K1) in series with the current sensor. According to the invention, the metrology portion (2) comprises a monitoring device that includes a second voltage divider (R1, R2) connected in parallel on the serial assembly formed by the sensor (Rshunt) and the cutoff contactor (K1), outputting a measurement Vphn upstream/downstream that represents the difference in potential between the phase conductor downstream from the cutoff contactor (K1) and the phase conductor upstream from the metrology portion. The various measurements can be used to detect various situations (pole integrity of the cutoff contactor, fraud by short-circuit, downstream self-generation, resetting the main circuit breaker) when the contactor is open or closed. |
