Patents by Inventor Edward Smithson

Edward Smithson 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).

  • Testing loop impedance in an RCCB electrical test circuit
    Patent number: 7271577
    Abstract: A method and apparatus for testing the loop impedance in residual current circuit breaker (RCCB) protected circuits is provided. An alternating test current is applied across the phase earth connections of a supply and a plurality of voltage samples are then taken across the connections. The voltage samples are subsequently transformed from time space to frequency space to allow the component due to the test current to be isolated. The loop impedance is then calculated.
    Type: Grant
    Filed: August 18, 2006
    Date of Patent: September 18, 2007
    Assignee: Megger Limited
    Inventors: Edward Smithson, Rongkai Xu, Agung Kurniawan Sadya Mandala, Freddie Yun Heng Chin
  • Testing loop impedance in an RCCB electrical test circuit
    Publication number: 20070063711
    Abstract: A method and apparatus for testing the loop impedance in residual current circuit breaker (RCCB) protected circuits is provided. An alternating test current is applied across the phase earth connections of a supply and a plurality of voltage samples are then taken across the connections. The voltage samples are subsequently transformed from time space to frequency space to allow the component due to the test current to be isolated. The loop impedance is then calculated.
    Type: Application
    Filed: August 18, 2006
    Publication date: March 22, 2007
    Inventors: Edward Smithson, Rongkai Xu, Agung Sadya Mandala, Freddie Chin