Improvements in electrical protection and control systems

Details Improvements in electrical protection and control systems Improvements in electrical protection and control systems

H - Electricity

02

H

H02H 7/00 (2006.01) H01H 71/04 (2006.01) H02H 1/00 (2006.01) H02J 13/00 (2006.01) H01H 9/16 (2006.01)

Patent

CA 2333333

A protection and control system incorporates status acquisition apparatus (100) for use in monitoring the status of a device in the protection and control system, such as a protection relay in a high voltage electrical circuit. The status acquisition apparatus comprises an conversion circuit (101) which converts an input voltage to a pulse width modulated signal and a comparison circuit (103) which monitors the pulse width modulated signal to determine the status of the device. The mark- space ratio of the pulse width modulated signal decreases as the input voltage is increased to minimise power dissipation over a range of input voltages. The status acquisition apparatus may form an integral part of a protective switching device, although other applications are envisaged.

Système de protection et de contrôle comprenant un dispositif d'acquisition d'état (100) utilisé pour surveiller l'état d'un dispositif dans le système de protection et de contrôle, par exemple, un relais de protection dans un circuit électrique à haute tension. Le dispositif d'acquisition d'état comprend un circuit de conversion (101) qui convertit un signal d'entrée de tension en un signal à largeur d'impulsion modulée et un circuit de comparaison (103) qui surveille ledit signal à impulsion modulée afin de déterminer l'état du dispositif. Le rapport des éléments travail/repos du signal à largeur d'impulsion modulée diminue à mesure que la tension d'entrée augmente afin de minimiser la dissipation de puissance sur une plage de valeurs de tension d'entrée. Le dispositif d'acquisition d'état peut faire partie intégrale du relais de protection, bien que d'autres applications sont envisagées.

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