Electronic circuit breaker using digital circuitry having...

H - Electricity – 02 – H

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H02H 3/08 (2006.01) H02H 3/093 (2006.01)

Patent

CA 2009597

Instantaneous trip capability is provided to an electronic circuit breaker, which is of the type that generates trip signals by accumulating squares of power line current samples and thresholds the accumulation results. Samples of power line current are taken directly from the current transformer and analog-to-digital converter cascade generating them. The analog-to-digital converter is of an oversampling type, using a delta-sigma modulator. The samples are threshold detected against a prescribed threshold value without previous squaring, integration and detection. The threshold detector result is checked for two consecutive overcurrent indications before an instantaneous trip signal is generated.

Cette invention concerne un coupe-circuit électronique à déclenchement instantané du type qui génère des signaux de déclenchement par sommation des carrés d'échantillons du courant d'alimentation et compare les résultats de la sommation à une valeur seuil. Les échantillons de courant sont prélevés directement à l'ensemble transformateur de courant/convertisseur analogique-numérique qui les génère. Le convertisseur analogique-numérique est du type à suréchantillonnage, à modulateur delta-sigma. Les échantillons sont comparés à une valeur seuil prédéterminée avant élévation au carré, intégration et détection. Le résultat de la comparaison est vérifié pour deux indications consécutives de surintensité avant qu'un signal de déclenchement instantané ne soit généré.

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