Patents by Inventor Tianchang LIU

Tianchang LIU 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).

  • Live measurement method for three-winding transformer loss based on windowed frequency shift
    Patent number: 11422175
    Abstract: Provided is a live measurement method for three-winding transformer loss based on windowed frequency shift. The method includes: step 1: providing an improved live calculation equation of a three-winding transformer loss; step 2: processing a collected x(t) signal by windowed frequency shift calculation; step 3: solving an amplitude and a phase of the collected x(t) signal via discrete Fourier transform of a frequency shift signal; and step 4: calculating a no-load loss and a load loss of a three-winding transformer.
    Type: Grant
    Filed: October 27, 2020
    Date of Patent: August 23, 2022
    Assignees: STATE GRID JIANGSU ELECTRIC POWER CO., LTD., STATE GRID JIANGSU ELECTRIC POWER CO., LTD. MARKETING CENTER
    Inventors: Qifeng Huang, Xiaoquan Lu, Shihai Yang, Mingming Chen, Zhixin Li, Bo Li, Huiling Su, Xiaodong Cao, Yuqin Chen, Hanmiao Cheng, Tianchang Liu, Yixuan Huang, Kaijie Fang
  • LIVE MEASUREMENT METHOD FOR THREE-WINDING TRANSFORMER LOSS BASED ON WINDOWED FREQUENCY SHIFT
    Publication number: 20210364562
    Abstract: Provided is a live measurement method for three-winding transformer loss based on windowed frequency shift. The method includes: step 1: providing an improved live calculation equation of a three-winding transformer loss; step 2: processing a collected x(t) signal by windowed frequency shift calculation; step 3: solving an amplitude and a phase of the collected x(t) signal via discrete Fourier transform of a frequency shift signal; and step 4: calculating a no-load loss and a load loss of a three-winding transformer.
    Type: Application
    Filed: October 27, 2020
    Publication date: November 25, 2021
    Inventors: Qifeng HUANG, Xiaoquan LU, Shihai YANG, Mingming CHEN, Zhixin LI, Bo LI, Huiling SU, Xiaodong CAO, Yuqin CHEN, Hanmiao CHENG, Tianchang LIU, Yixuan HUANG, Kaijie FANG