Aging state assessment of transformer cellulosic paper insulation using multivariate chemical indicators

Zhang, Enze; Zheng, Hanbo; Zhang, Chuansheng; Wang, Jiaqi; Shi, Kuikui; Guo, Jing; Schwarz, Harald; Zhang, Chaohai

doi:10.1007/s10570-021-03683-3

Cited by 28 publications

(12 citation statements)

References 38 publications

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“…There are few reports on Figure 2. Different from the detection of alcohols in transformer oil paper insulation (Zhang et al 2021), the qualitative study of low molecular weight carboxylic acids is mostly done by derivatization and gas chromatography-mass spectrometry combined technology. The BSTFA silanization reagent has the advantages of high derivatization rate and simple detection process when detecting low molecular weight molecule carboxylic acid substances (Šťávová et al 2012).…”

Section: Experimental Methods and Processmentioning

confidence: 99%

WITHDRAWN: Microscopic Reaction Mechanism of Formic Acid Generated During Pyrolysis of Cellulosic Insulating Paper

Zheng

Yang

et al. 2021

Preprint

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Cellulosic insulating paper is the component part of the insulation in power transformers. Under thermal stress inside the transformer, cellulosic insulating paper degrades to generate formic acid that will dissolve in insulating oil. In addition, the generation of formic acid further accelerates the aging process of insulating paper. This study took cellulose molecule with DP of 2 that was composed of D-glucose as the research object, the ReaxFF reaction force field was used to simulate the high temperature thermal aging process of cellulose. This study obtained the main reaction pathways of cellulose pyrolysis to generate formic acid. During the pyrolysis process, the number of formic acid molecules presented short-term fluctuations, which was the phenomenon of disappearance and regeneration of formic acid molecules. The combined element tracing method obtained three pathways of cellulose pyrolysis to generate formic acid: 1) The ether group oxygen atom O5(O'5) and C1(C'1) form a carbonyl group to generate formic acid. 2) Dehydrogenation of the primary alcohol hydroxyl group and the attached C atom form a carbonyl group to generate formic acid. 3) Dehydrogenation of the secondary alcohol hydroxyl group and the attached C atom form a carbonyl group to generate formic acid. Statistics found that the generation of formic acid molecules mainly come from the first pathway. The pre-exponential factor and activation energy of the calculated pyrolysis model were consistent with the experimental results. This study designed the accelerated thermal aging experiment of oil-paper insulation. The silanization derivatization method was used to detect the formic acid generated by the aging of insulating paper, which further verified the feasibility of formic acid as an index for evaluating the aging of cellulosic insulating paper.

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Section: Experimental Methods and Processmentioning

confidence: 99%

WITHDRAWN: Microscopic Reaction Mechanism of Formic Acid Generated During Pyrolysis of Cellulosic Insulating Paper

Zheng

Yang

et al. 2021

Preprint

Self Cite

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“…The fitting curve of SFCU versus ageing time at different ageing period: (a) P 0 , (b) P 1 , (c) P 2 , (d) P 3 [28]. Moreover, according to the principle of TTSP, the chemical reaction under high temperatures can be converted to the longer ageing time at lower temperatures by using the time-temperature shift factor α T , which is defined in Equation (8).…”

Section: F I G U R Ementioning

confidence: 99%

“…It is reported that the contribution of the ageing condition on measured Frequency Dielectric Spectroscopy (FDS) data can be easily concealed by the moisture effect [7]. Besides, the effect of temperature and oil change on the chemical markers to evaluate the DP of paper insulation needs further research [8]. In view of these issues, ageing kinetic models are capable of describing the variation law of DP and have the potential to accurately predict the DP of insulating paper under different conditions.…”

Section: Introductionmentioning

confidence: 99%

An improved second‐order kinetic model for degradation analysis of transformer paper insulation under non‐uniform thermal field

et al. 2022

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“…The other is that the aging of insulating paper will produce various substances, which are dissolved in oil and paper, and the content is dynamically balanced between oil and paper [24,25]. At this time, the aging degree of insulating paper can be judged by measuring the content of products in oil [26]. The difficulty of the problem is to find the best characteristic products.…”

Section: Introductionmentioning

confidence: 99%

A review on a novel method for aging evaluation of transformer insulating paper based on methanol

Chen

Sun

Cheng

et al. 2023

IET Generation Trans & Dist

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The insulation paper is a crucial factor for evaluating the insulation status of transformers. The traditional evaluation methods for insulation paper are dissolved gas component content analysis (CO and CO 2 ) and furfural (2-FAL) content analysis in oil. The detection principle of the former leads to its low accuracy, while the field application effect of the latter is not ideal due to the easy oxidation of furfural and low content. Methanol, result of its good stability and high production compared with other marker products (CO, CO 2 , 2-FAL) has been investigated as a novel marker for aging evaluation of transformer insulating paper in recent years. The results of the investigation indicated that there is a good correlation between the content of methanol in oil and the degree of polymerization under laboratory conditions, which reflected the insulation aging state of the transformer insulating paper more accurately. This paper summarizes the current research status of methanol formation mechanism, detection methods and aging evaluation in insulating oil, and points out the key problems to be solved and development prospects, hoping to provide relevant reference for aging evaluation of oil immersed power transformer.

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Aging state assessment of transformer cellulosic paper insulation using multivariate chemical indicators

Cited by 28 publications

References 38 publications

WITHDRAWN: Microscopic Reaction Mechanism of Formic Acid Generated During Pyrolysis of Cellulosic Insulating Paper

WITHDRAWN: Microscopic Reaction Mechanism of Formic Acid Generated During Pyrolysis of Cellulosic Insulating Paper

An improved second‐order kinetic model for degradation analysis of transformer paper insulation under non‐uniform thermal field

A review on a novel method for aging evaluation of transformer insulating paper based on methanol

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