George T. Mallick - Penn Hills PA Carl J. Heyne - Allison Park PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
H02P 150
US Classification:
318718
Abstract:
An electronic sensing and triggering circuit including an integrated overvoltage protection circuit is used in conjunction with an energy storage capacitor as well as output transistors for providing a vigorous voltage pulse supplied through a current pulse transformer to the gate of an SCR in a brushless excitation circuit discharge circuit branch.
Maurice J. Pasculle - Pittsburgh PA Edgar F. Merrill - Pittsburgh PA Carl J. Heyne - Allison Park PA
Assignee:
Westinghouse Electric Corporation - Pittsburgh PA
International Classification:
H02H 709
US Classification:
361 33
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.
Controlled Post-Synchronizing On Brushless Synchronous Motors
Carl J. Heyne - Allison Park PA Richard Cooper - Monroeville PA Gurney L. Godwin - Pittsburgh PA
Assignee:
Westinghouse Electric Corporation - Pittsburgh PA
International Classification:
H02P 150
US Classification:
318174
Abstract:
A static control system for applying excitation to synchronous motors, especially of the brushless type, by firing a semiconductor switch to apply direct current excitation to the field of the motor. A post-synchronization firing circuit is provided for firing the switch in response to the voltage across the switch if the motor pulls into synchronism before the switch is fired. A control circuit is provided for inhibiting the operation of the post-synchronizing firing circuit during subsynchronous operation.