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:
Jun. 07, 2022
Filed:
Oct. 10, 2019
State Grid Zhejiang Electric Power Co., Ltd. Taizhou Power Supply Company, Zhejiang, CN;
State Grid Corporation of China, Beijing, CN;
North China Electric Power University, Beijing, CN;
Ping Zhao, Zhejiang, CN;
Fengyuan Wang, Zhejiang, CN;
Chi Zhang, Zhejiang, CN;
Yuande Zheng, Zhejiang, CN;
Yudong Fang, Zhejiang, CN;
Hua Xu, Zhejiang, CN;
Zaibing Zhou, Zhejiang, CN;
Tao Zheng, Zhejiang, CN;
Yifan Zhu, Zhejiang, CN;
Chenjing Xu, Zhejiang, CN;
Tao Zhu, Zhejiang, CN;
Kang Wang, Zhejiang, CN;
Zhen Huang, Zhejiang, CN;
Guode Ying, Zhejiang, CN;
STATE GRID ZHEJIANG ELECTRIC POWER CO., LTD. TAIZHOU POWER SUPPLY COMPANY, Zhejiang, CN;
STATE GRID CORPORATION OF CHINA, Beijing, CN;
NORTH CHINA ELECTRIC POWER UNIVERSITY, Beijing, CN;
Abstract
Provided are a ground fault protection method and apparatus for a photovoltaic station output transmission line. A circuit breaker on a photovoltaic side is controlled by a control element. Whether measured zero sequence impedance on the photovoltaic side of a segment line has a large variation before and after an action of power grid side distance protection is determined, the variation of the measured zero sequence impedance is inputted into the control element, in condition that the variation of the measured zero sequence impedance is less than a setting value, a tripping signal is outputted to the circuit breaker on the photovoltaic side to isolate the fault; and in condition that the variation of the measured zero sequence impedance is greater than the setting value, photovoltaic side distance protection is not started.