Current differential protection relays

Details Current differential protection relays Current differential protection relays

2011-03-15

2011-03-15

Nguyen, Hoai-An D (Department: 2858)

Electricity: measuring and testing

Electromechanical switching device

Relay

C324S522000, C361S170000

Reexamination Certificate

active

07906970

ABSTRACT:
In the field of current differential protection relays there is a need for improvements in or relating to the protection relays to allow them to accommodate current transformer saturation while maintaining a desired degree of reliability. A method of operating a current differential protection relay following a fault, the protection relay being electrically coupled to a protection zone of an electrical power system, comprises the steps of establishing a fault condition by discriminating between an internal fault inside the protection zone and an external fault outside the protection zone; and modifying the sensitivity of the protection relay according to the nature of the fault condition.

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patent: 7812615 (2010-10-01), Gajic et al.
patent: 2010/0208403 (2010-08-01), Das et al.
patent: 2007027598 (2007-03-01), None

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