Standard control device of a circuit breaker opening or closing electromagnet
AssigneeSquare D Company
InventorsGhislain Durif, Jean-Pierre Nereau, Mustapha Chelloug
Life of this patent
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Abstract
The device compares a voltage representative of the supply voltage of the electromagnet with two distinct inrush thresholds and a drop-out threshold. As soon as this voltage reaches one of the inrush thresholds, the device commands switching to an inrush phase of preset duration. The first inrush threshold is representative of a voltage of about 40 to 50% of the rated supply voltage of the electromagnet, whereas the second inrush threshold is representative of 70 to 85% of this voltage. The same control device can thus be used with both an under-voltage release and a shunt release or for a circuit breaker closing electromagnet.
Claims10
A control device of a circuit breaker for opening or closing an electromagnet, said device comprising:
- at least one coil connected in series with an electronic switch to the terminals of a supply voltage,
- means for measuring a first voltage, representative of the supply voltage, and
- means for controlling the electromagnet, comprising means for comparing the first voltage with first and second inrush thresholds and a drop-out threshold, said means for comparing connected to the means for measuring the first voltage and to a control electrode of the electronic switch, and for monitoring the flow of an inrush current in the coil during an inrush phase of preset duration when the first voltage reaches one of the inrush thresholds.
Dependencies are inferred from the claim text.