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Proceedings Paper

FTIR analysis of transformer fault gases
Author(s): Xian-yong Liu; Li-ping Shang; Qiu-hai Zhong
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Paper Abstract

Dedicated experiments were made to clarify interference of the oil vapor, establish the quantitative analysis model and test its effectiveness in analyzing transformer fault gases with Fourier Transform Infrared. Nicolet Nexus 670 FTIR Spectrometer with a 2-meter vacuumable gas cell is used to collect and examine the spectra of the top gap gases and pyrolytic products of the transformer oil and no additional interference other than diagnostic gases were found. Standard gas samples of CH4, CO and CO2 are diluted with super pure nitrogen via mass control flowmeters to get samples with different concentrations dynamically. Spectra of the diluted samples are collected, analyzed and used as calibration standards to measure other samples. It is shown that the absorbance of the spectra can be calculated in height of the peak or in area under the peak and they vary with concentrations in approximate linearity, yet the former is more active and the latter is more passive to be saturated. Repeated measurements say the relative error of the established model is below 4% and typical measured concentrations are 537μL/L for methane and 57μL/L for monoxide.

Paper Details

Date Published: 10 January 2005
PDF: 8 pages
Proc. SPIE 5640, Infrared Components and Their Applications, (10 January 2005); doi: 10.1117/12.571701
Show Author Affiliations
Xian-yong Liu, Southwest Univ. of Science and Technology (China)
Li-ping Shang, Yanshan Univ. (China)
Qiu-hai Zhong, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 5640:
Infrared Components and Their Applications
Haimei Gong; Yi Cai; Jean-Pierre Chatard, Editor(s)

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