Variable reactance transformer

Details Variable reactance transformer Variable reactance transformer

1977-09-30

1978-12-12

Kozma, Thomas J.

Electricity: power supply or regulation systems

Remote sensing

323 89C, 336 12, 336155, 336215, H01F 2108, G05F 132

Patent

active

041298209

ABSTRACT:
An improved saturable reactance transformer having a main core and a pair of adjacent auxiliary cores is disclosed. The auxiliary cores carry DC control windings which regulate the reactance of the main core which carries the secondary, or output windings of the transformer. The primary winding is wound around all three cores, with the amplitude of the control voltage applied to the control windings regulating the output of the secondary windings. To prevent high voltage stresses in the transformer, each control winding is split into two or more windings, with the two windings being wound concentrically on their common core to reduce the voltage induced by the alternating current in the primary windings. In addition, the windings on the two auxiliary cores are cross-connected in pairs to equalize the reactance of each pair, thereby balancing the induced voltages. Finally, the transformer is physically constructed so that the start of the primary windings and the start of the control windings are at the same location so that the voltage difference between the finish of the control winding and the finish of the primary winding is subtractive rather than additive, thereby reducing the voltage stress imposed on the transformer insulation.
Three variable reactance transformers constructed in accordance with the foregoing are connected in a three phase configuration with their primary windings being delta-connected. The control windings of each transformer are connected to corresponding varible control sources to further reduce the induction of high stress voltages in the control windings by the primary alternating current.

REFERENCES:
patent: 3505588 (1970-04-01), Brock

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