Characteristics and Kinetics of Cellulose Degradation in Oil-Impregnated Pressboard under Simultaneous Thermal-Electrical-Mechanical Stress Accelerated Aging

Li, Shijun; Li, Shengtao; Yang, Liuqing; Ge, Zhao; Tan, Ben H.; Mao, Ganlin; Guo, Qirui

doi:10.1109/tdei.2021.009516

Cited by 10 publications

(9 citation statements)

References 17 publications

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“…At present, it is generally believed that when the DP is lower than 500, the oil/paper insulation system is moderately aged. When the DP is lower than 250, the oil/paper insulation system has been seriously aged [99]. However, the academic community has not yet reached an agreement on the identification of the end point of oil/paper insulation life.…”

Section: Relationship Between Methanol and The Life Of Insulating Papermentioning

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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Section: Relationship Between Methanol and The Life Of Insulating Papermentioning

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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show abstract

“…Our previous research [19] has revealed the characteristics and kinetics of cellulose degradation of the pressboard under simultaneous thermal-electrical-mechanical stress. In this section, correlation analysis is performed between the time-frequency domain characteristic parameters of compressive stress and the kinetics of cellulose degradation in order to analyze the effects of compressive stress on cellulose degradation of the pressboard under multi-stress aging.…”

Section: Effects Of Long-term Vibration On Cellulose Degradationmentioning

confidence: 99%

“…In previous research, we conducted an aging experiment of an OIP under simultaneous thermal-electrical-mechanical stress and investigated the characteristics and kinetics of cellulose degradation in the OIP [19]. However, it lacked a more detailed analysis regarding the effects of long-term mechanical vibrations on the cellulose degradation in the OIP.…”

Section: Introductionmentioning

confidence: 99%

Effects of Long-Term Vibration on Cellulose Degradation in an Oil-Impregnated Pressboard under Simultaneous Thermal–Electrical–Mechanical Stress Aging

Yang

2022

Energies

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Due to the complex operation conditions in a power transformer, an oil-impregnated pressboard (OIP) simultaneously suffers from thermal, electrical, and mechanical stress. Since most research studies have paid much attention to thermal or electrical aging of OIPs, this paper analyzes the effects of long-term mechanical vibrations on cellulose degradation in OIPs under simultaneous multi-stress. The aging experiments were firstly conducted at 130 °C, with a DC electric voltage of +6 kV, vibration amplitude of 10–50 μm, and vibration frequency of 100–300 Hz. The finite element analysis (FEA) of the pressboard vibration model was then performed on Abaqus to investigate the time–frequency domain characteristic parameters of compressive stress on the pressboard under varied vibration frequencies and amplitudes. The FEA results reveal that compressive stress on the pressboard in a multi-stress aging experiment coincided with the axial compressive stress on the insulation spacers in an SZ-50000/110 transformer. Moreover, combined with the degree of polymerization (DP) of cellulose, the effects of long-term vibration on cellulose degradation are reflected in two ways: the increase in compressive stress on the pressboard generates more links available for degradation, while more high frequency harmonic components in compressive stress accelerate the reaction rate in cellulose degradation.

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“…According to the TTSP theory, parameters k 10 and k 2 for different ageing areas is normalised to k 10 ' and k 2 ' at reference temperature (333.15 K) as shown in Equation (9).…”

Section: F I G U R Ementioning

confidence: 99%

“…Currently, kinetic models of cellulose degradation become a hotspot for researchers [9,10]. Among them, the pseudozero order Ekenstam's approximation [11] was derived from a more general first order kinetic equation [12], which regarded the reaction rate as a constant over a certain temperature range.…”

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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Characteristics and Kinetics of Cellulose Degradation in Oil-Impregnated Pressboard under Simultaneous Thermal-Electrical-Mechanical Stress Accelerated Aging

Cited by 10 publications

References 17 publications

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

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

Effects of Long-Term Vibration on Cellulose Degradation in an Oil-Impregnated Pressboard under Simultaneous Thermal–Electrical–Mechanical Stress Aging

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

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