Patents by Inventor Helmut Bilger

Helmut Bilger has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Three-phase transformer with in phase regulating winding for the regulation of phase voltages
    Patent number: 5977761
    Abstract: In the case of a three-phase transformer which, per phase (U, V, W), has a primary-side winding (U.sub.PW, V.sub.PW, W.sub.PW) and a secondary-side winding (U.sub.SW, V.sub.SW, W.sub.SW), in-phase regulating windings (U.sub.L, V.sub.L, W.sub.L) are provided on each limb per phase (U, V, W). These in-phase regulating windings (U.sub.L, V.sub.L, W.sub.L) serve, by means of a tap switch 3 and a load switch 6, for in-phase regulation for the purpose of reactive volt-amperes distribution in electrical power supply networks. In addition, the in-phase regulating windings (U.sub.L, V.sub.L, W.sub.L) are operatively connected via a further load switch 5 and a further tap switch 4 to a booster transformer (2). The voltages across primary windings U.sub.B, V.sub.B, W.sub.B of the booster transformer 2 effect quadrature or phase-angle regulation of the phase voltages U.sub.P, V.sub.P, W.sub.P in the three-phase transformer 1.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: November 2, 1999
    Assignee: Asea Brown Boveri AG
    Inventors: Helmut Bilger, Jean-Fran.cedilla.ois Ravot