Method and apparatus for indicating meter tampering

G - Physics – 08 – B

Patent

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G08B 21/00 (2006.01) G08B 13/14 (2006.01) G08B 23/00 (2006.01)

Patent

CA 2353631

Method and apparatus to facilitate improved sensing of tampering of an electrically powered device, such as an electric watt-hour meter installed at a residence for metering the amount of electric energy consumed at the residence. The detected tampering involves an effort to remove the electric meter from its power socket, to interrupt the metering of electric energy consumption, or to otherwise gain access for diverting electric energy. The method and apparatus senses motion (10) of the meter and sets a "Tampering Flag" in a non-volatile memory (12). The "Tamper Flag" is cleared if there is no loss of power to the meter within the predetermined period of time. Upon detecting a resumption of power after a loss of power to the meter, an indication of sensed tampering is made if the "Tamper Flag" is set.

L'invention concerne un procédé et un appareil permettant d'améliorer la détection d'interventions non autorisées d'un dispositif électrique, notamment un watt-heuremètre électrique monté dans un domicile servant à mesurer la quantité d'énergie électrique consommée à domicile. L'intervention non autorisée implique le retrait de l'appareil de mesure de sa prise, l'interruption de la mesure de la consommation d'électricité ou encore la déviation de l'électricité. Ce procédé et cet appareil permettent de détecter tout mouvement (10) de l'appareil de mesure et d'introduire un <= indicateur de fraude >= dans un mémoire rémanente (12). Cet <= indicateur de fraude >= est effacé s'il n'y a pas de perte d'électricité pendant une période de temps prédéterminée. La reprise de l'électricité à la suite d'une perte d'électricité du système de mesure entraîne la détection d'une intervention non autorisée si <= l'indicateur de fraude >= est allumé.

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