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Vol. 168, Issue 4, April 2014, pp. 127-132

 

Bullet

 

A Novel Approach for Analyzing Water Diffusion in Mineral and Vegetable
Oil-Paper Insulation
 

Bin Du, * Jian Li, Zhaotao Zhang

State Key Laboratory of Power Equipment & System Security and New Technology College of Electrical Engineering Chongqing University, Chongqing, 400044, China
* Tel.: +86 23 65106880, fax: +86 23 65102442

* E-mail: lijian@cqu.edu.cn

 

Received: 14 February 2014 /Accepted: 14 March 2014 /Published: 30 April 2014

Digital Sensors and Sensor Sysstems

 

Abstract: Water diffusion characteristics of mineral and vegetable oil-paper insulation systems are important for insulation condition evaluation of oil-filled transformers. In this paper, we describe a novel application method of in situ attenuated total reflection Fourier transform infrared (ATR-FTIR) approach for analyzing the diffusion process of water molecules in oil-immersed insulating paper. Two-dimensional correlation was used to analyze the 3700 cm-1 to 3000 cm- 1 hydroxyl peak. The observed results indicated that water molecules form two types of hydroxyl (OH) with oil-impregnated paper in the diffusion process are weak and strong hydrogen bonds, respectively. 2D infrared correlation analysis revealed that three OH stretching vibration spectra absorption peaks was existed in hygroscopic vegetable oil-immersed insulating paper. And there are four OH stretching vibration spectra absorption peaks in mineral oil-immersed insulation paper. Furthermore, mineral oil-impregnated paper and vegetable oil-impregnated paper diffusion coefficients were obtained by nonlinear fitting.

 

Keywords: ATR-FTIR, Oil-paper insulation, Water diffusion, Diffusion coefficient.

 

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