System for maintaining excitation of an alternating current...

Details System for maintaining excitation of an alternating current... System for maintaining excitation of an alternating current...

H - Electricity

02

P

322/13

H02P 9/00 (2006.01) H02H 7/06 (2006.01) H02P 9/10 (2006.01)

Patent

CA 1125370

SYSTEM FOR MAINTAINING EXCITATION OF AN ALTERNATING CURRENT GENERATOR DURING EXCESSIVE OUTPUT CURRENT CONDITIONS Abstract of the Disclosure In a generating system having a shunt-type reg- ulator for exciting the field of a generator during nor- mal operating conditions, circuitry is provided for sup- plying voltage to a field winding to maintain excitation of the generator during excessive output current condi- tions. This circuitry senses the low voltage indicative of a fault or overload condition and in response boosts the field of the field winding during such an excessive output current condition an amount sufficient to main- tain generator excitation during that particular condi- tion. It does this by impressing a voltage, supple- mental to that supplied by the regulator, upon the field winding during the condition. As a result the excita- tion of the generator is maintained.

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