NDLI: Finite element method modeled dielectric response for condition evaluation of transformer insulation

Content Provider	IEEE Xplore Digital Library
Author	Yi Cui Ekanayake, C. Saha, T.K. Peidong Du Hui Ma
Copyright Year	2013
Description	Author affiliation: Sch. of Inf. Technol. & Electr. Eng., Univ. of Queensland, Brisbane, QLD, Australia (Yi Cui; Ekanayake, C.; Saha, T.K.; Hui Ma) \|\| Electr. Power Res. Inst. of Gansu Province, Gansu, China (Peidong Du)
Abstract	Defects such as cracks and voids in the insulation medium of a power transformer may affect the dielectric response of transformer insulation system. This paper uses the finite element method (FEM) to analysis the influence of electric field distribution on the dielectric response of transformer oil-paper insulation system. Firstly a simple transformer winding insulation model consisting of several layers of pressboard and oil ducts is established in FEM. Here, two circumstances are taken into consideration to represent normal insulation and insulation with cracks penetrating all the layers. The complex capacitance (real part and imaginary part) is calculated to obtain general tendency of dielectric response of winding insulation in a transformer. Secondly, this paper proposes FEM model of a three phase oil-immersed power transformer insulation system. Based on the developed model, the dependency between electric field displacement, current density at the selected point with the applied electric field is discussed in detail. Moreover, the complex capacitance of transformer insulation is also studied. This will help to understand the correlations among insulation defects, electric field variations, and dielectric response of insulation.
Sponsorship	IEEE Dielectr. Electr. Insul. Soc.
Starting Page	39
Ending Page	42
File Size	1602029
Page Count	4
File Format	PDF
ISBN	9781479925971
DOI	10.1109/CEIDP.2013.6748314
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-20
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electric fields Windings Dielectrics Power transformer insulation Oil insulation FEM Dielectric response Insulation degradation Oil-paper insulation
Content Type	Text
Resource Type	Article

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