(under subclass 59) Subject matter wherein the generator excitation is controlled by interrupting the supply of voltage to a field winding by means of a circuit maker and breaker.
SEE OR SEARCH THIS CLASS, SUBCLASS:
54, for generator control under subclass 44 where the supply of voltage to the excitation circuit is interrupted by lifting the generator brushes.
72+, for generator control under subclass 59 where the excitation circuit is controlled by means of an electric space discharge device, vacuum tube gas vapor tube, or arc which may at times interrupt the supply of voltage to a field winding.
83, for generator control under subclass 59 where the excitation circuit is controlled by short circuiting a resistor in the excitation circuit, thereby varying the flow of current to a field winding.
SEE OR SEARCH CLASS 307, Electrical Transmission or Interconnection Systems,
104, for electrical systems which include therein an electromagnet or other highly inductive device.
318, Electricity: Motive Power Systems,
710+, for synchronous motors having field circuit control by breaking the field supply circuit.
361, Electricity: Electrical Systems and Devices,
52+, for safety and protection systems where the source of energy is controlled to control an improper operating condition (e.g., line fault).
