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Title:
METHOD AND APPARATUS FOR RAPIDLY ELIMINATING FERROMAGNETIC RESONANCE OF VOLTAGE TRANSFORMER
Document Type and Number:
WIPO Patent Application WO/2019/210768
Kind Code:
A1
Abstract:
Disclosed is a method for rapidly eliminating the ferromagnetic resonance of a voltage transformer. The method involves: first sampling a three-phase voltage and an open-delta voltage of a voltage transformer; calculating a magnetic linkage corresponding to a zero-sequence voltage by means of an integral algorithm; and when it is detected that ferromagnetic resonance occurs on the transformer, further checking whether an absolute value of the magnetic linkage corresponding to the zero-sequence voltage or an absolute value of the open-delta voltage respectively falls within a set range, and if so, starting a secondary resonance elimination circuit to eliminate resonance. Further disclosed is a corresponding apparatus for rapidly eliminating the ferromagnetic resonance of a voltage transformer. The method and the apparatus accurately analyze and control the resonance elimination trigger time on the basis of a conventional secondary resonance elimination principle and can effectively eliminate the impact of the core saturation of a voltage transformer on a resonance elimination process, thereby greatly improving the probability of successfully eliminating single resonance.

Inventors:
WANG, Honglin (No. 69 Suyuan Avenue, JiangningNanjing, Jiangsu 2, 211102, CN)
WANG, Kai (No. 69 Suyuan Avenue, JiangningNanjing, Jiangsu 2, 211102, CN)
ZHANG, Qixue (No. 69 Suyuan Avenue, JiangningNanjing, Jiangsu 2, 211102, CN)
WANG, Guang (No. 69 Suyuan Avenue, JiangningNanjing, Jiangsu 2, 211102, CN)
CHEN, Jun (No. 69 Suyuan Avenue, JiangningNanjing, Jiangsu 2, 211102, CN)
Application Number:
CN2019/082008
Publication Date:
November 07, 2019
Filing Date:
April 10, 2019
Export Citation:
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Assignee:
NR ELECTRIC CO., LTD (No.69 Suyuan Avenue, JiangningNanjing, Jiangsu 2, 211102, CN)
NR ENGINEERING CO., LTD (No. 69 Suyuan Avenue, JiangningNanjing, Jiangsu 2, 211102, CN)
International Classes:
H02H9/00
Foreign References:
CN104377680A2015-02-25
CN107332219A2017-11-07
Attorney, Agent or Firm:
NANJING ZONGHENG INTELLECTUAL PROPERTY AGENCY CO., LTD. (3th floor of Innovation Square, No.9 Gaoxin Road High-tech Zone PukouNanjing, Jiangsu 2, 210032, CN)
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