High voltage insulation monitoring sensor

G - Physics – 01 – R

Patent

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G01R 31/12 (2006.01)

Patent

CA 2623388

A sensor for condition monitoring the high voltage insulation of an electrical, generation, transmission or distribution system and/or an item of plant is described. The sensor comprises an impedance measurement unit that connects directly, via a single point of connection, to the electrical system to be tested. The electrical components of the impedance measurement unit are arranged so that high frequency partial discharge signals and low frequency power cycle information signal are preferentially transmitted through separate branches. Analysis of these separated signals thus enables extraction of information about the insulation of the electrical system being monitored. Safe operation of the sensor for users is also achieved through an opto- electronic circuit being employed to control the impedance measuring unit.

L'invention concerne un capteur de contrôle d'état d'isolation haute tension d'un système de génération, de transmission ou de distribution électrique et/ou d'un élément d'usine. Le capteur comprend une unité de mesure d'impédance qui est relié directement, via un point de connexion unique, au système électrique à tester. Les composants électriques de l'unité de mesure d'impédance sont conçus de sorte que des signaux de décharge partielle haute fréquence et un signal d'informations de cycle de puissance basse fréquence sont préférablement transmis par l'intermédiaire de branches séparées. Les analyses desdits signaux séparés permet l'extraction d'informations relatives à l'isolation du système électrique contrôlé. Un fonctionnement fiable du capteur pour les utilisateurs est également obtenu à travers l'utilisation d'un circuit optoélectronique pour contrôler l'unité de mesure d'impédance.

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