Transformers of large capacity for ultra-high voltages

Inductor devices – With means to change coil length or connections – Series change

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323 435R, H01F 2112

Patent

active

040471390

ABSTRACT:
Disclosed is a transformer of a large capacity for an ultra-high voltage which comprises a core leg coaxially wound sequentially with at least a low voltage winding, a high voltage winding composed of an upper and a lower winding section operated in a parallel connection and having a lead conductor led out from a center portion of the high voltage winding and extending to a terminal to be connected to a high voltage transmission line as well as connection leading-out wires taken out from the top and bottom end portions of the high voltage winding, and an upper and a lower tap winding disposed vertically spaced from each other with a predetermined distance and respectively connected to the upper and lower winding sections of the high voltage winding so as to be operated in a paralled connection therewith. Each of the upper and lower tap windings are disposed such that the magnetic center of each of the tap windings may be located at a height which corresponds to a value in the range of 55 to 65% of the height between the center portion of the high voltage winding at which the lead wire is led out and either ends thereof, whereby axial mechanical forces produced electro-magnetically in the tap windings are significantly reduced and the manufacture of the transformer is facilitated with an improved reliability thereof.

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