(under subclass 276) Systems in which the transformer is provided with means for changing the effective ratio of the input current or voltage to the output current or voltage.
(1) Note. Examples of transformers such as are used in the systems in this subclass are transformers having taps in the coils to vary the number of turns in the coil, or transformers having a high leakage path for the magnetic flux in the core, or transformers having the core designed to be saturated under certain load conditions in the magnetizing winding and to be unsaturated under other load conditions.
SEE OR SEARCH THIS CLASS, SUBCLASS:
257, for pulsating or A. C. supply, plural load device systems having a plural secondary or a tapped secondary transformer in the supply circuit.
278, for this subject matter where the transformer has three or more coils.
279, for this subject matter where there is a current regulating means in the primary circuit.
281, for this subject matter where the transformer is of the relatively movable coil and core type.
SEE OR SEARCH CLASS
323, Electricity: Power Supply or Regulation Systems,
355, 363 and the subclasses specified in the notes to the definition of those subclasses for miscellaneous transformer systems and for transformer systems for controlling the magnitude of the current and/or voltage in a single circuit.
336, Inductor Devices, appropriate subclasses for the structure of transformers and inductive reactors. See especially
150, and the subclasses specified in the Notes thereto, for transformers with tapped coils; and subclasses 155+ for transformers and inductive reactors of the leakage reactance type and of the saturating type.
