Patents by Inventor Hannu Ruokolainen

Hannu Ruokolainen 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).

  • Externally gapped line arrester
    Patent number: 11322913
    Abstract: An externally gapped line arrester, EGLA, for transmission lines, the EGLA including a series varistor unit, SVU, having a first end and a second end, the SVU configured to be connected between a transmission line and ground, a primary sparkover gap unit serially connected to the first end of the SVU, a secondary gap arranged between the second end of the SVU and ground, and the secondary gap serially connected to the second end of the SVU, a shorting-link device connected in parallel with the secondary gap, and a disconnecting device arranged in the shorting-link device, the disconnecting device configured to open the shorting-link device when the SVU is overloaded. A method for impulse protection performed by an EGLA is also disclosed.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: May 3, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventor: Hannu Ruokolainen
  • Externally Gapped Line Arrester
    Publication number: 20200119528
    Abstract: An externally gapped line arrester, EGLA, for transmission lines, the EGLA including a series varistor unit, SVU, having a first end and a second end, the SVU configured to be connected between a transmission line and ground, a primary sparkover gap unit serially connected to the first end of the SVU, a secondary gap arranged between the second end of the SVU and ground, and the secondary gap serially connected to the second end of the SVU, a shorting-link device connected in parallel with the secondary gap, and a disconnecting device arranged in the shorting-link device, the disconnecting device configured to open the shorting-link device when the SVU is overloaded. A method for impulse protection performed by an EGLA is also disclosed.
    Type: Application
    Filed: December 13, 2019
    Publication date: April 16, 2020
    Inventor: Hannu Ruokolainen