Patents by Inventor Pere Planas

Pere Planas 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).

  • Earth leakage protective relay
    Patent number: 6025980
    Abstract: An earth fault detection circuit employs a differential current transformer and burden resistor to sample circuit current for potential earth fault current. A second order low pass filter circuit is employed to filter out harmonics within the protected circuit and a time delay circuit is used to insure the occurrence of a true earth fault leakage condition. A circuit with an operational amplifier is used to create a symmetric power supply for the rest of the circuits from a full wave rectified AC source.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: February 15, 2000
    Assignee: General Electric Company
    Inventors: Ricardo Morron, David Moreno, Pere Planas