Electronic trip device comprising a storage device

Details Electronic trip device comprising a storage device Electronic trip device comprising a storage device

1995-04-04

1997-04-01

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340649, G08B 2100

Patent

active

056170785

ABSTRACT:
An electronic trip device having a processing unit producing a tripping signal when currents of a power system to be protected exceed preset thresholds for preset times, and a trip storage device connected to the processing unit, the storage device having a storage circuit comprising two terminals, a diode connected in series with a capacitor between the terminals and a resistor connected in parallel with the capacitor, the storage device being able to inject a strong current to charge the capacitor via the diode before tripping and able to inject a weak current when the trip device is put into operation, and to measure the voltage at the terminals of the storage circuit.

REFERENCES:
patent: 4979070 (1990-12-01), Bodkin
patent: 5014043 (1991-05-01), Lopetrone et al.
patent: 5136456 (1992-08-01), Yeh
patent: 5168414 (1992-12-01), Horstmann

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