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Optimization of Ethanol Detection by Automatic Headspace Method for Cellulose Insulation Aging of Oil-immersed Transformers

The method using ethanol to evaluate the cellulose insulation aging condition of oil-immersed transformers has been proposed. At present, the dominating method for detecting ethanol in insulating oil is to use headspace–gas-chromatography–mass-spectrometry (HS-GC-MS). However, the problem of quantit...

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Autores principales: Zheng, Hanbo, Zhang, Chuansheng, Zhang, Yiyi, Liu, Jiefeng, Zhang, Enze, Shi, Zhen, Shao, Guangqi, Shi, Kuikui, Guo, Jing, Zhang, Chaohai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7407484/
https://www.ncbi.nlm.nih.gov/pubmed/32679756
http://dx.doi.org/10.3390/polym12071567
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author Zheng, Hanbo
Zhang, Chuansheng
Zhang, Yiyi
Liu, Jiefeng
Zhang, Enze
Shi, Zhen
Shao, Guangqi
Shi, Kuikui
Guo, Jing
Zhang, Chaohai
author_facet Zheng, Hanbo
Zhang, Chuansheng
Zhang, Yiyi
Liu, Jiefeng
Zhang, Enze
Shi, Zhen
Shao, Guangqi
Shi, Kuikui
Guo, Jing
Zhang, Chaohai
author_sort Zheng, Hanbo
collection PubMed
description The method using ethanol to evaluate the cellulose insulation aging condition of oil-immersed transformers has been proposed. At present, the dominating method for detecting ethanol in insulating oil is to use headspace–gas-chromatography–mass-spectrometry (HS-GC-MS). However, the problem of quantitative inaccuracy will be sometimes encountered in the actual detection process due to improper instrument parameter setting and improper manual operation. In this study, as an aging marker, ethanol in transformer insulating oil was separated by using VF-624 ms capillary column. The effects of gas-chromatography–mass-spectrometry (GC-MS) optimization conditions, headspace equilibrium temperature, headspace equilibrium time and standard solution preparation method on the determination of ethanol content in oil were discussed, and optimized measures were proposed. The experimental results showed that the measurement can be more accurate under the headspace temperature of 80 °C and the headspace time of 40 min, and relative standard deviation percentage (RSD%) could reach to 4.62% under this condition. It was also pointed out that, for the preparation of standard solution, the method which controlled the sampling volume of anhydrous ethanol by microliter syringe could make the peak area of ethanol chromatogram have a better linear relationship with the standard curve. Under the similar linear range, the goodness of fitting curve without diluting process could be as high as 0.9993, while the method of preparing the stock solution and diluting stepwise to obtain the fitting curve only had a goodness of 0.9910. The method was validated by standard addition recovery test, and the recovery values obtained were between 90.3% and 95.8%. The optimized method is of great significance for the measurement of ethanol dissolved in insulating oil.
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spelling pubmed-74074842020-08-25 Optimization of Ethanol Detection by Automatic Headspace Method for Cellulose Insulation Aging of Oil-immersed Transformers Zheng, Hanbo Zhang, Chuansheng Zhang, Yiyi Liu, Jiefeng Zhang, Enze Shi, Zhen Shao, Guangqi Shi, Kuikui Guo, Jing Zhang, Chaohai Polymers (Basel) Article The method using ethanol to evaluate the cellulose insulation aging condition of oil-immersed transformers has been proposed. At present, the dominating method for detecting ethanol in insulating oil is to use headspace–gas-chromatography–mass-spectrometry (HS-GC-MS). However, the problem of quantitative inaccuracy will be sometimes encountered in the actual detection process due to improper instrument parameter setting and improper manual operation. In this study, as an aging marker, ethanol in transformer insulating oil was separated by using VF-624 ms capillary column. The effects of gas-chromatography–mass-spectrometry (GC-MS) optimization conditions, headspace equilibrium temperature, headspace equilibrium time and standard solution preparation method on the determination of ethanol content in oil were discussed, and optimized measures were proposed. The experimental results showed that the measurement can be more accurate under the headspace temperature of 80 °C and the headspace time of 40 min, and relative standard deviation percentage (RSD%) could reach to 4.62% under this condition. It was also pointed out that, for the preparation of standard solution, the method which controlled the sampling volume of anhydrous ethanol by microliter syringe could make the peak area of ethanol chromatogram have a better linear relationship with the standard curve. Under the similar linear range, the goodness of fitting curve without diluting process could be as high as 0.9993, while the method of preparing the stock solution and diluting stepwise to obtain the fitting curve only had a goodness of 0.9910. The method was validated by standard addition recovery test, and the recovery values obtained were between 90.3% and 95.8%. The optimized method is of great significance for the measurement of ethanol dissolved in insulating oil. MDPI 2020-07-15 /pmc/articles/PMC7407484/ /pubmed/32679756 http://dx.doi.org/10.3390/polym12071567 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zheng, Hanbo
Zhang, Chuansheng
Zhang, Yiyi
Liu, Jiefeng
Zhang, Enze
Shi, Zhen
Shao, Guangqi
Shi, Kuikui
Guo, Jing
Zhang, Chaohai
Optimization of Ethanol Detection by Automatic Headspace Method for Cellulose Insulation Aging of Oil-immersed Transformers
title Optimization of Ethanol Detection by Automatic Headspace Method for Cellulose Insulation Aging of Oil-immersed Transformers
title_full Optimization of Ethanol Detection by Automatic Headspace Method for Cellulose Insulation Aging of Oil-immersed Transformers
title_fullStr Optimization of Ethanol Detection by Automatic Headspace Method for Cellulose Insulation Aging of Oil-immersed Transformers
title_full_unstemmed Optimization of Ethanol Detection by Automatic Headspace Method for Cellulose Insulation Aging of Oil-immersed Transformers
title_short Optimization of Ethanol Detection by Automatic Headspace Method for Cellulose Insulation Aging of Oil-immersed Transformers
title_sort optimization of ethanol detection by automatic headspace method for cellulose insulation aging of oil-immersed transformers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7407484/
https://www.ncbi.nlm.nih.gov/pubmed/32679756
http://dx.doi.org/10.3390/polym12071567
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