Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1997-04-09
1998-09-29
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 85, 361 87, 364483, H02H 300
Patent
active
058153578
ABSTRACT:
A method and apparatus is disclosed for complete three-phase sensing using two current transformers. Two phases of a three-phase system are used as the primary windings in each current transformer such that each current transformer produces a phasor representation of a sum of the two phases. A three phase sensor is provided to add the phasor representations produced by each of the current transformers and to produce a third phasor representation from the summation. The three phasor representations can then be applied to any conventional overload relay control to monitor each phase and produces a trip signal to open the three-phase system when a phasor representation exceeds some predetermined value, or the magnitudes of the phasors differ by more than a predefined value.
REFERENCES:
patent: 2202998 (1940-06-01), Seeger et al.
patent: 3604982 (1971-09-01), McDonald
patent: 3614533 (1971-10-01), Douglas et al.
patent: 3875464 (1975-04-01), Gary et al.
patent: 4574229 (1986-03-01), Kim
patent: 4683513 (1987-07-01), Miller
patent: 4683515 (1987-07-01), Beihoff et al.
patent: 4879626 (1989-11-01), Kim
patent: 4967304 (1990-10-01), Dougherty
patent: 5113304 (1992-05-01), Ozaki et al.
patent: 5220478 (1993-06-01), Innes et al.
patent: 5239438 (1993-08-01), Echtler
patent: 5450268 (1995-09-01), Phillips et al.
patent: 5506743 (1996-04-01), Phillips
patent: 5579194 (1996-11-01), Mackenzie et al.
Blakely John H.
Innes Mark E.
Eaton Corporation
Gaffin Jeffrey A.
Sherry Michael J.
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