Differential protection device

Details Differential protection device Differential protection device

2011-05-24

2011-05-24

Patel, Dharti H (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S043000, C361S044000, C361S045000, C361S046000, C361S047000, C361S048000, C361S049000, C361S050000

Reexamination Certificate

active

07948722

ABSTRACT:
A differential protection device comprising:differential current measuring means,processing means connected to the measuring means and comprising operating rating selection means and time delay selection means to select tripping curves,actuating means, andtest means connected to the measuring means.In the protection device the test means are associated with the operating rating selection means and with the time delay selection means to select a minimum or reduced operating rating and to select a minimum or reduced time delay when said test means are actuated.

REFERENCES:
patent: 4833564 (1989-05-01), Pardue et al.
patent: 6421214 (2002-07-01), Packard et al.
patent: 6831819 (2004-12-01), Nemir et al.
patent: 0 936 716 (1999-08-01), None

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