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:
Oct. 02, 2018
Filed:
Mar. 22, 2016
Xj Group Corporation, Xuchang, CN;
Xj Electric Co., Ltd, Xuchang, CN;
Xuchang Xj Software Technologies Ltd, Xuchang, CN;
State Grid Corporation of China, Beijing, CN;
Jirui Chen, Xuchang, CN;
Jiansong Zhao, Xuchang, CN;
Yun Gong, Xuchang, CN;
Maojun Deng, Xuchang, CN;
Chuankun Ni, Xuchang, CN;
Dongxiao Yao, Xuchang, CN;
Heke Ma, Xuchang, CN;
Lijuan Lv, Xuchang, CN;
Baowei Li, Xuchang, CN;
Xu Li, Xuchang, CN;
Jidong Huang, Xuchang, CN;
Feng Xiao, Xuchang, CN;
Shasha Hu, Xuchang, CN;
Jingli Zhang, Xuchang, CN;
Yingying Xi, Xuchang, CN;
XJ GROUP CORPORATION, Xuchang, CN;
STATE GRID CORPORATION OF CHINA, Beijing, CN;
Abstract
The present invention relates to a prevention method of abnormal action protection of UHV regulating compensation transformer with no-load input, the prevention method includes: first determining a value of differential current of regulating compensation transformer, if the value of differential current is smaller than a pre-setting threshold, then, identifying whether an uninterruptible point of differential current waveform meets an pre-setting regulation according to original value of differential current or sampling value of differential difference current, and determining comprehensively whether the regulating compensation transformer is in no-load input or in fault directly with a value of second harmonic content of logic differential current together; if a value of differential current before pre-setting period is larger than the pre-setting threshold, the regulating compensation transformer is diagnosed to have external CT saturation, determining comprehensively whether the regulating compensation transformer is in no-load input or in fault by using result of the uninterruptible point after delaying and the value of second harmonic content of logic difference together, and corresponding inactivating or activating differential protection. By using the value of differential current before a pre-setting period, characteristics of the original value of differential current and the sampling value of differential difference current, and second harmonic inrush to discriminate an pre-setting regulation, the present invention can avoid the regulating compensation transformer occurring abnormal action when no-load switching transformer of UHV substation is charging, and isolating the fault quickly when the no-load switching transformer is in fault state.