Patents by Inventor Melren V. Mathis

Melren V. Mathis 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).

  • In-service testing of current transformers
    Patent number: 6680616
    Abstract: A system and method for testing an on-line current transformer is provided. The current transformer includes a primary winding and a secondary winding. An operating current continues to flow through the primary winding during testing of the current transformer. A controllable load is applied to the current transformer secondary winding. The controllable load is varied over a range of load settings including a maximum current setting and a maximum voltage setting. At a plurality of load settings within the range of load settings, a current flowing through the current transformer secondary winding is measured. Also, a voltage across the current transformer secondary winding is measured. An actual excitation curve is generated from the measured currents and voltages corresponding to the plurality of load settings.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: January 20, 2004
    Assignee: Kuhlman Electric Corporation
    Inventors: Vladimir M. Khalin, Melren V. Mathis, Hayes K. Wyatt
  • In-service testing of current transformers
    Publication number: 20020109507
    Abstract: A system and method for testing an on-line current transformer is provided. The current transformer includes a primary winding and a secondary winding. An operating current continues to flow through the primary winding during testing of the current transformer. A controllable load is applied to the current transformer secondary winding. The controllable load is varied over a range of load settings including a maximum current setting and a maximum voltage setting. At a plurality of load settings within the range of load settings, a current flowing through the current transformer secondary winding is measured. Also, a voltage across the current transformer secondary winding is measured. An actual excitation curve is generated from the measured currents and voltages corresponding to the plurality of load settings.
    Type: Application
    Filed: January 28, 2002
    Publication date: August 15, 2002
    Inventors: Vladimir M. Khalin, Melren V. Mathis, Hayes K. Wyatt