Current overload tripping device with leading tripping action

Details Current overload tripping device with leading tripping action Current overload tripping device with leading tripping action

1988-06-28

1990-05-29

Picard, Leo P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 96, G11B 1568

Patent

active

049300385

ABSTRACT:
A current overload tripping device having a time-delayed leading tripping action during uneven loading of the phases of a multiphase circuit. The tripping device includes a current pickup for each phase wherein the current pickup members are connected in series with one another and with an electromagnetic converter. Each of the current pickup members comprises a winding surrounding a magnet yoke of an electromagnetic tripping device of each phase and the electromagnetic converter comprises a temperature/time-dependent device operating to provide a time-delayed tripping signal.

REFERENCES:
patent: 4644438 (1987-02-01), Puccinelli
patent: 4780786 (1988-10-01), Weynatcher

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