Electronic trip device comprising a capacitor for supply of...

Details Electronic trip device comprising a capacitor for supply of... Electronic trip device comprising a capacitor for supply of...

2005-01-11

2005-01-11

Salata, Jonathan (Department: 2837)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific circuit breaker or control structure

C361S096000, C361S087000

Reexamination Certificate

active

06842322

ABSTRACT:
The trip device comprises a system-powered power supply circuit comprising a capacitor for power supply of a trip coil. When the trip device is powered on, the capacitor charges and its voltage is regulated according to a first reference voltage sufficient to activate the trip coil if necessary. After a preset period, regulation of the voltage at the terminals of the capacitor is performed according to a second reference voltage, lower than the first voltage. The reference voltage reverts to the first value during the same preset period when the measured current reaches a preset threshold, which constitutes an indication of the presence of a fault that will lead to tripping being required. The capacitor is therefore generally charged at a lower voltage than that which is necessary for tripping, thus enabling its size to be reduced.

REFERENCES:
patent: 4567540 (1986-01-01), Ruta
patent: 32 23 687 (1984-01-01), None

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