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:
Nov. 13, 2018
Filed:
Jan. 08, 2015
Nr Electric Co., Ltd., Nanjing, Jiangsu, CN;
Nr Electric Engineering Co., Ltd., Nanjing, Jiangsu, CN;
Qixue Zhang, Jiangsu, CN;
Baoli Xu, Jiangsu, CN;
Jie Zhang, Jiangsu, CN;
Huazhong Li, Jiangsu, CN;
Yaoyao Ji, Jiangsu, CN;
Shouping Zhong, Jiangsu, CN;
Guang Wang, Jiangsu, CN;
Jun Chen, Jiangsu, CN;
Wei Yan, Jiangsu, CN;
NR ELECTRIC CO., LTD., Nanjing, Jiangsu, CN;
NR ELECTRIC ENGINEERING CO., LTD., Nanjing, Jiangsu, CN;
Abstract
A relay protection method against LC parallel circuit detuning faults comprises the steps of: a relay protection device samples a current of a parallel LC, that is, a reactor and a capacitor, and samples a total current flowing through the whole LC; convert the current of the reactor into a current of an equivalent capacitor; calculate amplitudes of the current of the equivalent capacitor and a current of a realistic capacitor and calculate an amplitude of the total current flowing through the LC; calculate a current amplitude ratio of the equivalent capacitor to the realistic capacitor; and when the amplitude of the total current flowing through the LC is large enough, send an alarm signal or a trip after a setting time delay if the current ratio exceeds a preset upper and lower limit range. Also provided is a corresponding relay protection device.