The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 2022
Filed:
Apr. 30, 2021
Applicant:
Tianjin University, Tianjin, CN;
Inventors:
Assignee:
TIANJIN UNIVERSITY, Tianjin, CN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 7/16 (2006.01); H02H 7/26 (2006.01);
U.S. Cl.
CPC ...
H02H 7/16 (2013.01); H02H 7/268 (2013.01);
Abstract
The invention relates to a grounding fault protection method for a high-voltage capacitor of a direct-current filter. The method comprises the following steps of acquiring a head end voltage u and an unbalanced current iof a direct-current filter, and acquiring a discrete head end voltage and unbalanced current sequence; calculating a virtual capacitance C; determining a protection setting value Caccording to the bridge arm capacitance of the high-voltage capacitor, and when the virtual capacitance Cis larger than the protection setting value C, protecting and judging to be an internal fault; otherwise, protecting and judging to be an external fault.