NDLI: Modelling the low-frequency electrode dielectric response based on transformer equivalent oil-paper insulation model

Content Provider	IET Digital Library
Author	Zhang, Mingze Liu, Ji Jia, Haifeng Chen, Qingguo Lv, Jialu Chen, Xin
Abstract	The oil-impregnated transformer is an important part of the power system. The ageing degree of the internal oil-paper insulation determines the service life of the transformer. The low frequency of the frequency domain dielectric spectroscopy can effectively characterise the ageing degree of transformer oil-paper insulation. For accurately and quantitatively evaluate the aging state of oil-paper insulation of transformer, the physical process of low-frequency electrode polarisation is theoretically analysed in this work. Considering the polarisation of the low-frequency electrode, the theoretical expression of the dielectric response of the equivalent XY model of the transformer is obtained. Meanwhile, to verify the rationality of the theoretical expression, the accelerated thermal ageing test of the oil-paper insulation samples were carried out under laboratory conditions. The DC conductivity, ion mobility and FDS tests of oil-paper insulation samples were tested on ageing 5, 10 and 15 days, respectively. The test results were combined with the theoretical expression of the low-frequency dielectric response. It is found that the difference between the calculated result and the measured result is small. Therefore, the theoretical expression of the transformer equivalent XY model can be applied to calculate the dielectric parameters of the oil-paper insulation at low-frequency.
Starting Page	700
Ending Page	707
Page Count	8
ISSN	17518822
Volume Number	13
e-ISSN	17518830
Issue Number	Issue 5, Jul (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/13/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2018.5495
Journal	IET Science, Measurement & Technology
Publisher Date	2019-02-25
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Accelerated Thermal Ageing Test Ageing Ageing Degree Aging State Dielectric Permittivity Frequency Domain Internal Oil-paper Insulation Low Frequency Low-frequency Dielectric Response Low-frequency Electrode Dielectric Response Low-frequency Electrode Polarisation Oil-impregnated Transformer Oil-paper Insulation Sample Oils Organic Insulation Paper Photonic Technology Power Transformer Insulation Theoretical Expression Time 10.0 D Time 15.0 D Time 5.0 D Transformer And Reactors Transformer Equivalent Oil-paper Insulation Model Transformer Equivalent XY Model Transformer Oil Transformer Oil-paper Insulation
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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