Patents by Inventor Jonas Schenström

Jonas Schenström 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).

  • Method and a device for controlling a secondary voltage in a transformer device connected to a power network and comprising an on-load tap-changer
    Patent number: 6313614
    Abstract: In a method for controlling a secondary voltage (US) in a transformer device connected to a power network with a given system frequency (f1), which transformer device comprises a tap-changer (TC) which, in dependence on a supplied control signal (RCS), influences the voltage ratio (RAT) of the transformer device, a voltage variable (uE) is formed in dependence on the secondary voltage. The voltage variable comprises at least one first control component (u1, &phgr;1) which represents a fundamental component of the secondary voltage, and a control quantity (EPV, EEV) is formed in dependence on the voltage variable. The control signal is formed in dependence on a deviation (DPV, DEV) between the control quantity and a given reference value (PVR, EVR) therefor and is supplied to the tap-changer. The actual fundamental frequency (f1*) of the power network is continuously sensed and the voltage variable is formed in dependence thereon.
    Type: Grant
    Filed: August 16, 2000
    Date of Patent: November 6, 2001
    Assignee: ABB AB
    Inventors: Niklas Persson, Jonas Schenström