(under subclass 69) Subject matter wherein the generator excitation circuit is intermittently completed and opened.
(1) Note. The effective average excitation current is determined by the frequency of the interruption and the ratio of the time the circuit is completed to the time the circuit is broken.
SEE OR SEARCH THIS CLASS, SUBCLASS:
84, for generator control systems under subclass 59 where a resistor in series with a field winding is periodically short circuited.
SEE OR SEARCH CLASS
200, Electricity: Circuit Makers and Breakers,
19.01+, for miscellaneous periodic switches. 307, Electrical Transmission or Interconnection Systems,
96+, for electrical systems which are regulated by an intermittent regulatory interruption of the system.
318, Electricity: Motive Power Systems,
537, for motor control by intermittently or repetitiously operated field circuit making and/or breaking means.
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,
87+, for electromagnetically operated periodic switches.
