Automatic flashover protection for locomotive traction motors

Details Automatic flashover protection for locomotive traction motors Automatic flashover protection for locomotive traction motors

H - Electricity

02

H

H02H 7/08 (2006.01) B60L 3/00 (2006.01)

Patent

CA 2071920

Flashover protection is provided for a locomotive propulsion system including a plurality of d-c traction motors (15, 16) each having a commutator (15A) subject to flashovers. A flashover detector (32) is provided for producing a fault signal in case a flashover occurs. In response to the fault signal, a solid-state controllable electric valve (71) connected between the excitation cur- rent source (17) and the alternator field winding (12f) is changed to a non- conducting state, whereupon the magnitude of excit- ation current in the alternator field winding (12f) is rapidly reduced toward zero and the alternator's output current is correspon- dingly decreased whenever a flashover occurs.

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