System for protection of electrical machines against damage from

Details System for protection of electrical machines against damage from System for protection of electrical machines against damage from

1987-05-01

1988-09-20

Tolin, G. P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 29, 361 33, 207 86, 207142, H02H 708

Patent

active

047729775

ABSTRACT:
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 induction 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.

REFERENCES:
patent: 4271446 (1981-06-01), Comstock
patent: 4710841 (1987-12-01), Bottrell

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