Effects of Thiophene Degradation on the Corrosiveness of Oil and the Properties of Oil–Paper Insulation in the Oil-Immersed Transformers

Gao, Sihang; Feng, Shaoxuan; Ke, Tingjing; Chen, Yiduo; Zeng, Xisong

doi:10.1109/tdei.2022.3216529

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…However, little effect can be found on the volume resistivity of the GBCD copper curve. The higher volume resistivity of GBCD copper can be reflected in the fewer generated conductive substances (Cu 2 S) and conductive paths [14, 24]. This further indicates that GBCD insulating oils have higher oxidation resistance for restricted sulfur corrosion.…”

Section: Resultsmentioning

confidence: 99%

“…From the outer environmental impact factors, temperatures [13,18], oxygen [19], electric field [20], and related synergistic effects [21,22] were the research hotspots. From the inner oilpaper insulating system, scholars have recently focused on the following points: thiophene (C 4 H 4 S) degradation in various oil brands [23,24], gas production of passivators in oils [25,26], the moisture in the oil-paper system [27,28], and the cellulose structure of oil-impregnated paper [29] etc.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the grain boundary character distribution on the sulfur corrosion behaviour and mechanisms of copper windings under different high temperatures

Dai,

Yuan,

Zhou

et al. 2024

High Voltage

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As a typical failure phenomenon in transformers, sulfur corrosion has garnered significant attention in the field of high‐voltage engineering. Grain boundary character distribution (GBCD) copper windings have been introduced to enhance sulfur corrosion resistance by slowing down intergranular corrosion. In this study, the sulfur corrosion behaviour and mechanisms of the GBCD copper windings under various temperatures were experimentally and theoretically studied. Results show that GBCD can enhance the corrosion resistance of copper in liquid environments. With the increase in temperatures, the insulating properties of oil and papers in traditional copper windings experience notable degradation, while GBCD copper windings show more stable insulating behaviours. In addition, modelling of grain boundary energy indicates that the grain boundary structure of GBCD copper windings has a lower average interface energy of 0.170 eV/Å2. Calculations of reaction thermodynamics show that GBCD copper windings possess a higher failure temperature (135.2°C) and inhibition degree (activation energy) of the sulfur corrosion (32,557.62 J/mol), revealing the stability and enhanced sulfur corrosion resistance at elevated temperatures.

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Section: Resultsmentioning

confidence: 99%