NDLI: Study on suppressing harmonics for multi-function balanced transformer

Content Provider	IEEE Xplore Digital Library
Author	Zhiwen Zhang Yaonan Wang Jianying Li Zhiyao Xiong Fushing Liu
Copyright Year	2003
Description	Author affiliation: Coll. of Electr. & Inf. Eng., Hunan Univ., Changsha, China (Zhiwen Zhang; Yaonan Wang; Jianying Li; Zhiyao Xiong; Fushing Liu)
Abstract	The multi-function balanced transformer (MFBT) is a new-type traction transformer based on patent. The MFBT is characterized by transforming voltages from three-phase 110 kV to two-phase 27.5 kV as well as three-phase 110 kV to three-phase 10.5 kV simultaneously. This paper studies a novel filter associated with the MFBT, presents the new filtering model of harmonics, describes the new filtering approach, and derives a sample formula to calculate the parameters of this filter. The new three-phase filters were connected to the position at three 10.5 kV voltage terminals in the secondary side. Every one of three-phase filters simply consisted of reactors and capacitors in series, but its parameters were particularly designed by utilizing the filter model presented in this paper. The feature of this filter was that the ratio of inductive reactance to capacitive reactance is less than 1/9, not conventional 0.12. The new three-phase filters and other assorted equipments associated with the MFBT were installed in the local transformer substation, Minqing, Fujian. Many experiments to approve the operational feasibility were completed when connecting the three-phase filters to 10.5 kV terminals. Contrastive experiments were also performed for conventional two-phase filters. A great deal of data was measured by DSA2000, 24-channels synthetical analyzing instrument for electric energy, and GXF-908C, harmonic analyzing instrument. Contrast analysis showed that new filtering approach caused the harmonic currents to decrease by 49.74% in maximum and 27.42% in the average, compared to the conventional method. It is concluded that the model presented is correct and the new method is quite effective to suppress higher harmonics. The new filters can reduce the primary harmonic currents extremely. Since the class of insulation of equipments for the new three-phase filters falls, the costs of apparatus will be decreased.
Sponsorship	China Electrotechnical Soc. Chinese Soc. for Electrical Eng. Korean Inst. of Electrical Eng. Nat. Natural Sci. Found. of China
Starting Page	305
Ending Page	308
File Size	266054
Page Count	4
File Format	PDF
ISBN	750626210X
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-11-09
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	International Academic Publishers/World Publishing Corporation
Subject Keyword	Power harmonic filters Filtering Harmonic analysis Instruments Voltage Inductors Capacitors Power transformer insulation Substations Joining processes
Content Type	Text
Resource Type	Article

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