Field protector for synchronous machines

Details Field protector for synchronous machines Field protector for synchronous machines

1975-03-25

1977-08-09

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

310 68R, 361124, H02H 709

Patent

active

040415430

ABSTRACT:
Apparatus for overvoltage protection of the field winding of a synchronous dynamoelectric machine. A protective spark gap device is electrically connected in parallel across the field winding of the machine and is designed to weld itself into a short-circuit when the voltage across the field winding increases to an unacceptable value. The weldable spark gap provides a positive indication of problems in the field circuit and at the same time protects the field circuit from damage from continued operation. The protective spark gap is not self-restoring and therefore must be removed and replaced before operation is resumed.

REFERENCES:
patent: 1049366 (1913-01-01), Jackson
patent: 1212129 (1917-01-01), Chernyshoff
patent: 1287244 (1918-12-01), Creighton
patent: 1457249 (1923-05-01), Janson et al.
patent: 1834786 (1931-12-01), Kacser
patent: 2430206 (1947-11-01), Beck et al.
patent: 3435290 (1969-03-01), Lyman
patent: 3723794 (1973-03-01), Spisak et al.
patent: 3849704 (1974-11-01), Streater
patent: 3898533 (1975-08-01), Scudner, Jr.

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