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:
Sep. 19, 2023
Filed:
Dec. 27, 2018
Taizhou Power Supply Company of State Grid Zhejiang Electric Power, Zhejiang, CN;
State Grid Corporation of China, Beijing, CN;
Ping Zhao, Zhejiang, CN;
Chi Zhang, Zhejiang, CN;
Yiping Shen, Zhejiang, CN;
Yutao Qiu, Zhejiang, CN;
Hua Xu, Zhejiang, CN;
Xiaochun Xu, Jiangsu, CN;
Hao Li, Zhejiang, CN;
Yuande Zheng, Zhejiang, CN;
Zaibing Zhou, Zhejiang, CN;
Zhen Huang, Zhejiang, CN;
Kang Wang, Zhejiang, CN;
Jian Wu, Zhejiang, CN;
Tao Zhu, Zhejiang, CN;
Hao Tan, Jiangsu, CN;
Ben Li, Jiangsu, CN;
Qingchun Zhao, Jiangsu, CN;
Xiaotong Zhu, Jiangsu, CN;
Chen Zhou, Zhejiang, CN;
Guode Ying, Zhejiang, CN;
Zheng Qin, Zhejiang, CN;
Xu Jiang, Zhejiang, CN;
TAIZHOU POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER, Zhejiang, CN;
STATE GRID CORPORATION OF CHINA, Beijing, CN;
Abstract
Provided is a determination method of differential protection suitable for an electricity transmission line with multi-terminal T-connection. The determination method includes: sampling and calculating all phase currents, and calculating a maximum fault component current Δİin phase current amplitudes of each phase current, a differential current Iin the each phase current, a resistive current Iin the each phase current and a vector sum Δİof fault component currents except Δİin the phase current amplitudes of the each phase current; and comparing the maximum fault component current Δİin phase current amplitudes of each phase current and a threshold setting value I, determining a value of a resistive coefficient K corresponding to the phase current amplitudes of the each phase current according to a comparison result, and performing differential determination on the differential current Iand the resistive current Iin phase current amplitudes of the each phase current according to a differential determination formula: if the differential current Iof the target phase satisfies the above differential determination formula, it is determined that a fault occurs in an area of the target phase.