The Effects of Corrosive Sulfur in Bushing: Corrosion of Aluminum Foil and its Effect of Oil-Paper Insulation

Jian, Zhou; Yuan, Yuan; Liu, Guoyong; Zhang, Chenghang

doi:10.1109/access.2019.2944478

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…Figure 3 shows the potential dynamic polarisation of the original copper and GBCD copper. Corrosion potential ( E corr ) and corrosion current density ( i corr ) can be extracted by the Tafel extrapolation in the strong polarisation region [40]. The calculated electrochemical parameters are shown in Table 2 to evaluate the corrosion resistance of specimens.…”

Section: Resultsmentioning

confidence: 99%

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%

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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“…This indicates that pressboard aged with DBDS leads to a higher potential magnitude with a lower decay rate compared to its ageing under varying concentrations of Ag2S. The reason for the above change in the surface potential is the higher conductive nature of pressboard material due to the diffusion of DBDS [28] resulting in higher degradation of the cellulosic pressboard material compared to its effect with the addition of Ag2S. These results are in agreement with the surface discharge analysis, and could be used as an alternative technique to comment on the early detection of incipient discharges.…”

Section: B Surface Potential and Trap Characteristics Of Aged Pressbo...mentioning

confidence: 95%

Impact of DBDS and Silver Sulfide on the Performance of Thermally Aged Mineral oil Impregnated Pressboard Material

et al. 2022

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The corrosive sulfur compounds present in the mineral oil causes the formation of dibenzyl disulfide (DBDS) complex and it can also erode the on-load tap changing selector contacts leading to generation of silver sulfide (AgS2).The present work reports the effect of DBDS and Ag2S concentrations in mineral oil on thermally aged pressboard material. The results demonstrate that surface discharge inception voltage (SDIV) is higher for the aged pressboard specimen. The higher concentrations of DBDS showed a reduction of more than 50% in the magnitude of SDIV compared to its effect with the addition of Ag2S. The surface potential analysis indicates a higher initial potential for the aged specimens with an increased half lifetime. In addition, only deep traps observed on the aged specimens with a slight right shift in its trap energy level. The mechanical strength of aged pressboard specimens with DBDS and Ag2S is understood using tensile testing and simultaneous analysis is captured using Digital Image Correlation (DIC) technique to understand its strain percentage at different areas on the pressboard material during its elongation. The laser induced breakdown spectroscopy (LIBS) analysis is performed to identify the elements responsible for thermal ageing such as carbon, copper and sulfur on the surface of pressboard material. The plasma temperature calculated from sulfur peaks is higher for DBDS aged specimen compared to AgS2 and a linear correlation is observed on the LIBS intensity with ageing duration. Further, the Principal Component Analysis (PCA) is used for its classification on the degradation of pressboard due to the diffusion of both copper and silver sulfide from the mineral oil. The two principal components (PC1 and PC2) provided a higher variance of 99.8% with a clear classification observed between the unaged and aged pressboard specimens due to the addition of both DBDS and Ag2S in mineral oil.

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“…In addition, the problem of sulphur corrosion has also been found in bushings due to corrosive sulphur besides transformers and shunt reactors [120][121][122]. As a result, sulphur corrosion should not be ignored, and thorough and effective methods still need to be explored.…”

Section: Grain Boundary Engineering Technologymentioning

confidence: 99%

A review: Research on corrosive sulphur in electrical power equipment

et al. 2021

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Corrosive sulphur has been commonly regarded as an enormous threat to electrical power equipment in recent decades. Cuprous sulphide (Cu 2 S) deposition on the insulating oil and paper insulation caused by sulphur corrosion will bring about insulation deteriorations or failures in power transformers and shunt reactors. A large number of experiments have been carried out to investigate sulphur corrosion and some measures have been come up to solve this issue such as replacement of insulating oil, chemical removal of corrosive sulphur and the addition of passivator and so on. However, there has not been a perfect method to work out this problem completely, and the phenomenon of sulphur corrosion still occurs. This paper intends to provide thorough information of corrosive sulphur in power equipment and give detailed explanations about its corrosion mechanism, hazards and control measures, which is supposed to offer a reference for subsequent researchers.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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The Effects of Corrosive Sulfur in Bushing: Corrosion of Aluminum Foil and its Effect of Oil-Paper Insulation

Cited by 6 publications

References 17 publications

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

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

Impact of DBDS and Silver Sulfide on the Performance of Thermally Aged Mineral oil Impregnated Pressboard Material

A review: Research on corrosive sulphur in electrical power equipment

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