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:
Aug. 23, 2022
Filed:
May. 02, 2018
Nr Electric Co., Ltd., Jiangsu, CN;
Nr Engineering Co., Ltd., Jiangsu, CN;
Jiasheng Chen, Jiangsu, CN;
Guang Wang, Jiangsu, CN;
Kai Wang, Jiangsu, CN;
Yao Wang, Jiangsu, CN;
Jun Chen, Jiangsu, CN;
Qixue Zhang, Jiangsu, CN;
Zigang Guo, Jiangsu, CN;
Huazhong Li, Jiangsu, CN;
NR ELECTRIC CO., LTD, Jiangsu, CN;
Abstract
The present invention discloses a method for detecting open phase of a startup/standby transformer based on optical CT. A startup/standby transformer in a power plant is in a no-load condition for a long time as a standby power supply. Once a single-phase open phase fault occurs, there is no significant change in the voltage phasor and voltage sequence component of each side. If not found in time, the defect may pose a great threat to the safe operation of the power plant. In the present invention, the optical CT is used to detect a three-phase current of the high-voltage side of the startup/standby transformer. If the current satisfies an open phase criterion, it is determined that an open phase fault occurs, and then, an alarm signal is given after a delay and an operator is informed to handle the fault in time. Therefore, the operation reliability of the startup/standby transformer system in the power plant is enhanced.