Electrically controllable inductor

Details Electrically controllable inductor Electrically controllable inductor

1994-03-04

1996-06-04

Nguyen, Matthew V.

Electricity: power supply or regulation systems

For reactive power control

Using saturable inductor

336160, G05F 170, H01F 2728

Patent

active

055236731

ABSTRACT:
An apparatus for providing an electrically controllable inductor uses a first and a second magnetic core (20, 24) spaced apart from one another. A DC bias coil (22) is wound on the first magnetic core (20). An inductor coil (26) is wound on both the first magnetic core (20) and the second magnetic core (24). The inductance seen at terminal connections (80, 82) of the inductor coil (26) is variable in dependence upon a magnitude of a flow of direct current through the DC bias coil (22). In one embodiment of the inductor, the first and the second magnetic core (20, 24) are each formed using a pair of U-shaped core segments (30, 32, 60, 62) located adjacent to one another. In this embodiment, the first and second magnetic core (20, 24) are located in an opposing relation to one another, with the DC bias coil (22) wound on inner legs (64, 72) of the first magnetic core (20) and the inductor coil (26) wound on inner legs (64, 72, 34, 44) of both the first and the second magnetic core (20, 24). A system employing the electrically controllable inductor is provided for dynamic correction of power factor and reduction of harmonics of a three-phase power line.

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International Search Report dated 19 Jun. 1995.
"ABB Power Systems AB, HVDC Division," Ludvika, Sweden (1994).

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