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:
Apr. 20, 2021
Filed:
Jul. 11, 2016
China Electric Power Research Institute Company Limited, Beijing, CN;
State Grid Corporation of China, Beijing, CN;
Central China Branch of State Grid Corporation of China, Wuhan, CN;
Xuming Liang, Beijing, CN;
Yarong Guo, Beijing, CN;
Huanzhang Liu, Wuhan, CN;
Xiao Li, Beijing, CN;
Zexin Zhou, Beijing, CN;
Dingxiang Du, Beijing, CN;
Delin Wang, Beijing, CN;
Jing Li, Beijing, CN;
Huixin Li, Wuhan, CN;
Zhongqing Li, Beijing, CN;
CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED, Beijing, CN;
STATE GRID CORPORATION OF CHINA, Beijing, CN;
CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINA, Hubei, CN;
Abstract
A current differential protection method for a self-adaptive half-wavelength line based on a time-difference method. Since an electrical distance of half-wavelength power transmission is long, after a fault occurs, there is an obvious time difference between the actuation times for protecting starting elements at two sides of a line. According to the principles of wave propagation, the position of a fault point can be determined by means of a difference between the actuation times for protecting the starting elements at the two sides of the line. By means of taking the fault point as a differential point, a current value at the differential point can be obtained according to a long line equation by means of the voltage and current at protection-mounted positions at the two sides of the line, and a differential current is then calculated.