System for protection of dynamo-electric a.c. machines...

Details System for protection of dynamo-electric a.c. machines... System for protection of dynamo-electric a.c. machines...

H - Electricity

02

H

348/18, 318/98

H02H 7/09 (2006.01)

Patent

CA 1295661

SYSTEM FOR PROTECTION OF DYNAMO-ELECTRIC A.C. MACHINES AGAINST DAMAGE FROM RESIDUAL VOLTAGE EFFECTS ABSTRACT OF THE DISCLOSURE A system for use with electrical machines allows fast transfers to be made from one power source to another or fast reconnections to be made to a momentarily interrupted power source without subjecting the machines to unsafe voltage levels. The system short circuits the electrical machines to bring their residual voltage down quickly to a level at which the machines may be safely connected to a power source, and works with both induct- ion and synchronous machines. No interlocking devices are necessary to the system, thus further speeding up fast transfer while minimizing the effects of inadvertent direct short circuiting of the power source.

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