Inductor devices – With means to change coil length or connections – Series change
Patent
1977-01-27
1978-08-15
Kozma, Thomas J.
Inductor devices
With means to change coil length or connections
Series change
200 11TC, 200 18, H01F 2112, H01H 300
Patent
active
041076370
ABSTRACT:
Tap changing apparatus for switching the turns ratio between the primary and secondary windings of a three-phase transformer. The tap changer includes three mounting boards, one for each phase of the transformer. Each board contains a plurality of stationary contacts arranged in a circular pattern around an axis of rotation and connected to taps from various sections of the transformer windings. A movable contact assembly is associated with each set of stationary contacts and is rotatable around the center axis of each respective contact set. Each movable contact assembly is affixed to a worm gear which operates to rotate the movable contacts between successive stationary contacts in each respective contact set. Separate worms, which mesh with each respective worm gear, are connected along a common axis by a series of insulated shafts, which link the worms with an operating handle mounted outside the transformer enclosure, such that movement of the operating handle causes all three worms to rotate thereby switching the movable contacts between successive stationary contacts.
REFERENCES:
patent: 3155782 (1964-11-01), Wilson, Jr.
Hanlon, Jr. William M.
Kozma Thomas J.
Westinghouse Electric Corp.
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