DocumentCode :
27953
Title :
Improved Online Monitoring Method for Transformer Winding Deformations Based on the Lissajous Graphical Analysis of Voltage and Current
Author :
Chenguo Yao ; Zhongyong Zhao ; Yan Mi ; Chengxiang Li ; Yifan Liao ; Guochao Qian
Author_Institution :
State Key Lab. of Power Transm. Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China
Volume :
30
Issue :
4
fYear :
2015
fDate :
Aug. 2015
Firstpage :
1965
Lastpage :
1973
Abstract :
Power transformers have important roles as voltage converters in substations, which directly affect the safe operation of power grids. Online monitoring of winding deformation, which is one of the most common transformer faults, is crucial in protecting transformers from damage, particularly those induced by short-circuit current failures, and ensuring their safe operation. This study proposes an improved online monitoring method for winding deformations based on the Lissajous graphical analysis of voltage and current. A practical measurement system is also presented and discussed in this paper. A load normalization method is proposed to solve the problem of Lissajous diagrams changing as load varies. Finally, transformer and winding experiments are performed to verify the validity of the proposed load normalization method and the feasibility of the proposed monitoring method in distinguishing winding deformations with different degrees and locations.
Keywords :
failure analysis; graph theory; power convertors; power grids; power system measurement; power system reliability; power transformer protection; short-circuit currents; substation protection; transformer windings; Lissajous diagram problem; current Lissajous graphical analysis; load normalization method; power grid safe operation; power transformer winding deformation online monitoring method improvement; short-circuit current failure; substation measurement system; transformer faults; voltage Lissajous graphical analysis; voltage converter; Circuit faults; Current measurement; Frequency measurement; Mathematical model; Power transformers; Voltage measurement; Windings; Lissajous graphical analysis; load normalization; winding deformation;
fLanguage :
English
Journal_Title :
Power Delivery, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8977
Type :
jour
DOI :
10.1109/TPWRD.2015.2418344
Filename :
7086082
Link To Document :
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