Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1990-09-18
1992-12-01
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 42, 361 23, 322 69, 322 27, H02H 708
Patent
active
051684160
ABSTRACT:
Flashover protection is provided for a locomotive propulsion system including a plurality of d-c traction motors each having a commutator subject to flashovers, a traction alternator having armature and field windings and a rotor driven by a prime mover, a controllable source of excitation current connected to the alternator field, and means including an electric power rectifier for connecting the alternator to the motor commutators. It comprises means for producing a fault signal whenever a flashover occurs in any motor, a solid-state controllable electric valve connected between the excitation current source and the alternator field and having alternative conducting and non-conducting states, and means for changing the valve from conducting to non-conducting states in response to a fault signal being produced, whereupon the magnitude of excitation current in the alternator field is rapidly reduced toward zero and the alternator's output current is correspondingly decreased whenever a flashover occurs.
REFERENCES:
patent: 4112475 (1978-09-01), Stitt et al.
patent: 4475139 (1984-10-01), Chadwick
patent: 4608619 (1986-08-01), Bomer et al.
patent: 4634887 (1987-01-01), Balch et al.
Bailey Ronald B.
Balch Edgar T.
Brown Herbert J.
Huczko Roger D.
Laukaitis Joseph A.
General Electric Company
Payne R. Thomas
Pellinen A. D.
Schultz C.
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