Patents by Inventor Graeme LLOYD

Graeme LLOYD 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).

  • Protection system and method for an electrical variable speed doubly fed induction machine
    Patent number: 9768609
    Abstract: A protection system for an electrical variable speed doubly fed induction machine having a stator and a rotor, comprising: instrument transformers capable of measuring low frequency signals from the rotor and stator, in particular low frequency signals in the range of 0.1 Hz to 6 Hz; a protection relay which is configured to receive measurement values from the instrument transformers and to sample said measurements values at a constant sampling rate.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: September 19, 2017
    Assignee: ALSTOM TECHNOLOGY LTD
    Inventors: Graeme Lloyd, Li Zou, Chang An
  • PROTECTION SYSTEM AND METHOD FOR AN ELECTRICAL VARIABLE SPEED DOUBLY FED INDUCTION MACHINE
    Publication number: 20160013632
    Abstract: A protection system for an electrical variable speed doubly fed induction machine having a stator and a rotor, comprising: instrument transformers capable of measuring low frequency signals from the rotor and stator, in particular low frequency signals in the range of 0.1 Hz to 6 Hz; a protection relay which is configured to receive measurement values from the instrument transformers and to sample said measurements values at a constant sampling rate.
    Type: Application
    Filed: February 25, 2014
    Publication date: January 14, 2016
    Applicant: ALSTOM TECHNOLOGY LTD
    Inventors: Graeme LLOYD, Li ZOU, Chang AN