Condition Assessment of Paper Insulation in Oil-Immersed Power Transformers Based on the Iterative Inversion of Resistivity

Jiangjun Ruan, Shuo Jin, Zhiye Du, Yiming Xie, Lin Zhu, Yu Tian, Ruohan Gong, Guannan Li and Min Xiong
Additional contact information
Jiangjun Ruan: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Shuo Jin: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Zhiye Du: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Yiming Xie: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Lin Zhu: State Grid Hubei Electric Power Company Technology Training Center, Wuhan 430079, China
Yu Tian: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Ruohan Gong: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Guannan Li: School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Min Xiong: School of Electrical Engineering, Wuhan University, Wuhan 430072, China

Energies, 2017, vol. 10, issue 4, 1-15

Abstract: The resistivity of oil impregnated paper will decrease during its aging process. This paper takes paper resistivity as an assessment index to evaluate the insulation condition of oil impregnated paper in power transformer. The feasibility of this method are discussed in two aspects: reliability and sensitivity. Iterative inversion of paper resistivity was combined with finite element simulation. Both the bisection method and Newton’s method were used as iterative methods. After the analysis and comparison, Newton’s method was selected as the first option of paper resistivity iteration for its faster convergence. In order to consider the spatial distribution characteristic of paper aging and enhance the calculation accuracy, the resistivity calculation is expanded to a multivariate iteration based on Newton’s method, in order to consider the spatial distribution characteristic of paper aging and improve the calculation accuracy. This paper presents an exploratory research on condition assessment of oil impregnated paper insulation, and provides some reference to the security and economy operation of power transformers.

Keywords: condition assessment; oil impregnated paper; resistivity; iteration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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