Electronic trip device that detects an imminent drop of the powe

Details Electronic trip device that detects an imminent drop of the powe Electronic trip device that detects an imminent drop of the powe

1997-07-29

1998-12-15

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 93, 361 87, H02H 504

Patent

active

058503307

ABSTRACT:
The electronic trip device with a thermal memory including a capacitor and a charging resistor arranged in parallel. In normal operation, the capacitor is permanently charged by a supply voltage supplied by the power system to be protected. The trip device includes a processing circuit which performs tripping functions after calculation of a thermal value representative of the thermal state of the power system and detects an imminent drop of the supply voltage. When such a drop is detected, the processing circuit orders discharging of the capacitor until the voltage at the terminals of the capacitor is representative of the calculated numerical value.

REFERENCES:
patent: 3643130 (1972-02-01), Liska et al.
patent: 4476724 (1984-10-01), Kaneko et al.
patent: 5038246 (1991-08-01), Durivage, III
patent: 5617078 (1997-04-01), Durif et al.
patent: 5675336 (1997-10-01), Hakkarinen

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