Protection relay and process

Details Protection relay and process Protection relay and process

1998-01-27

2000-02-29

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

H02H 504

Patent

active

060317035

ABSTRACT:
The protection relay comprises a processing unit and temperature sensors associated to conductors, an ambient temperature sensor, and setting devices connected to circuits which perform tripping functions. A first short delay tripping circuit supplies a tripping order to a relay if a value of the temperature variation of a conductor exceeds a first setting threshold. A second long delay tripping circuit supplies a tripping order to the relay if a value of the temperature difference between the temperature of a conductor and the ambient temperature exceeds a second setting threshold. The protection relay is used notably for trip devices and circuit breakers.

REFERENCES:
patent: 4683515 (1987-07-01), Beihoff et al.
patent: 5115371 (1992-05-01), Tripodi
Patent Abstracts of Japan vol. 017, No. 152 (E-1340), Mar. 25, 1993 & JP 04 317511 A (Mitsubishi Electric Corp), Nov. 9, 1992 *abstract*.
Database WPI, Section PQ, Week 9404, Derwent Publications Ltd., London, GB.; Class Q14, AN 94-033594 XP002044396 & SU 1 786 585 A (Rost Rail Eng Inst), Jan. 7, 1993 *abstract*.

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