NDLI: Influential factor analysis and computation on electric field of converter transformer barrier

Content Provider	IEEE Xplore Digital Library
Author	Shuai Hou Ye Tian Mingli Fu Xiangli Zhu Ge
Copyright Year	2015
Description	Author affiliation: Electr. Power Res. Inst., China Southern Power Grid, Guangzhou, China (Shuai Hou; Ye Tian; Mingli Fu) \|\| MOE Key Lab. of Eng. Dielectr., Harbin Univ. of Sci. & Technol., Harbin, China (Xiangli Zhu Ge)
Abstract	Bushing and barrier system are the critical components in ultra high voltage (UHV) converter transformer for safe operation. Electric field distributions within bushing and barrier system are complicated in UHV converter transformer under combined AC and DC voltages, which, as a consequence, results in some technical difficulties in insulation structure design and manufacture. The paper presents the FEM electric field simulation of busing barrier structure under AC, DC and polarity reversal operation voltages. Firstly, the research results show that transformer oil with lower relative dielectric constant undertakes higher field strength under the AC voltage, whilst the insulating pressboard with higher resistivity bears higher field strength under the DC voltage, and the maximum field strength occurs in the insulating coating on the shielding ring surface. Moreover, extremely high field strength appears in transformer oil due to the space charge accumulation during voltage polarity reversal. Secondly, the research indicates that temperature has a big influence on electric field distribution of barrier system under DC voltage, specifically, with reduction of temperature the electric field distribution among oil and pressboard becomes increasingly uneven. Finally, the feasibility of applying nonlinear insulating pressboard to replace tradition pressboard in barrier system insulation structure is discussed and concludes that the nonlinear pressboard could improve electric field distribution dramatically.
Starting Page	228
Ending Page	231
File Size	1360976
Page Count	4
File Format	PDF
ISSN	21609241
e-ISBN	9781479989034
DOI	10.1109/ICPADM.2015.7295250
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-19
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power transformer insulation Oil insulation Electric fields Insulators Conductivity converter transformer electric field distribution barrier system
Content Type	Text
Resource Type	Article

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