Development of Quantitative Evaluation of Copper Sulfide Deposition on Insulating Paper

Kawarai, H.; Fujita, Y.; Tanimura, Junji; Toyama, S; Yamada, Naoya; Nagao, E.; Amimoto, T.

doi:10.1109/ceidp.2008.4772810

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…This can also explain why the Cu 2 S deposition amount will rise first and then decrease when the oxygen concentration increases [61]. After the insulating paper is oxidised, there would be more micropores, which would increase the deposition amount in the insulating paper for their strong adsorption capacity for copper ions and Cu 2 S solid particles [62]. The oxygen concentration in the transformer oil would affect the adhesion of Cu 2 S on the surface of copper wire and insulating paper, but would basically not affect the reaction of DBDS and copper strip [63, 64].…”

Section: Environmental Impact Factors Of Sulphur Corrosionmentioning

confidence: 99%

“…In addition, abnormalities can also be found by monitoring the copper ion content, acid value, furfural in the oil, combined with similar transformers and historical data. (ii) Field operation environment control: the laboratory studies have shown that the oxygen content in the oil would accelerate the rate of sulphur corrosion [54,[60][61][62][63][64], so the oxygen content in the oil should be reduced to slow down the rate of sulphur corrosion. The oxygen in the oil mainly comes from the air.…”

Section: Field Operation Measures For Sulphur Corrosionmentioning

confidence: 99%

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Reviews on sulphur corrosion phenomenon of the oil–paper insulating system in mineral oil transformer

et al. 2020

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The active sulphur compounds in transformer oil would react with copper wires and produce cuprous sulphides, which then attach themselves to the surface of copper wires and insulating paper, thus reducing the electrical performance of oil-paper insulation and causing insulation failure. This article aims to make a comprehensive summary on the field of sulphur corrosion of oil-paper insulation in the mineral oil transformer, including the corrosion mechanism of sulphide on copper sheets, the deterioration mechanism of sulphide on oil-paper, the factors influencing sulphur corrosion reaction, the method of characterising the degree of sulphur corrosion, the protection technology of sulphur corrosion and the field operation measures for sulphur corrosion. Moreover, four key problems that need to be further solved were sorted out: the synergistic deterioration mechanism of sulphide and its transformation mechanism, the micro-process and forming path of sulphur corrosion reaction, the characteristic parameters and quantitative characterisation methods of sulphur corrosion degree, and the effective protection technology of sulphide corrosion. To solve these problems, efforts will be made for deeper understanding of the sulphur corrosion phenomenon and its deterioration mechanism based on theoretical background, the assessment methods and protection technology, endeavouring to put forward solid theoretical basis and feasible technical means for preventing sulphur corrosion insulation failure. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Environmental Impact Factors Of Sulphur Corrosionmentioning

confidence: 99%

Section: Field Operation Measures For Sulphur Corrosionmentioning

confidence: 99%

Reviews on sulphur corrosion phenomenon of the oil–paper insulating system in mineral oil transformer

et al. 2020

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“…As a result, the presence of monosulfides and thiols are possible upon thermal decomposition of dibenzyl disulfide. Several studies have shown that degraded transformer oil containing DBDS also exhibits the presence of BM and DBS. ,,,− Lewand and Reed considered the formation of Cu 2 S to be initiated by the degradation product, benzyl mercaptan, in which it reacts with Cu + to form Cu 2 S (see Scheme ). In this reaction, the other product formed would be ethylbenzene, but to date no evidence for its formation has been reported.…”

Section: Introductionmentioning

confidence: 99%

Formation of Corrosive Sulfur with Dibenzyl Disulfide in Fluid-Filled Transformers

Dukhi

Bissessur

Martincigh

2016

Ind. Eng. Chem. Res.

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The formation of corrosive sulfur as a result of the addition of dibenzyl disulfide (DBDS) to transformer oils has been investigated. Corrosive sulfur in a transformer affects all aspects of its insulation and conductive components by deposition of Cu2S. Previous studies have suggested that the formation of Cu2S was initiated by a DBDS–Cu complex. This work shows an alternate pathway via thiolate formation for the deposition of corrosive sulfur on copper conductors. The open circuit potential results showed no reduction of DBDS onto copper surfaces, but the degradation products of DBDS, which include dibenzyl sulfide and benzyl mercaptan, were both found to adsorb on copper surfaces, forming a copper thiolate. The formation of copper thiolates was also demonstrated by a heterogeneous reaction of CuO and benzyl mercaptan. Thermal degradation of the thiolate eventually produced copper sulfide Cu7.2S4 as identified by X-ray diffraction analysis.

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“…Meanwhile, some literatures pointed out that the main corrosive sulfide in the transformer oil was (DBDS) [7][8]. Besides, Bengtsson et al [9] considered that the oxygen concentration in the oils affected the deposition of Cu 2 S on the paper surface [10].…”

Section: Introductionmentioning

confidence: 99%

The impact of corrosive sulfur concentration in transformer oil on the electrical properties of insulated windings

Huang

Yang

et al. 2014

2014 ICHVE International Conference on High Voltage Engineering and Application

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Dibenzyl disulfide (DBDS) is considered as one of the sulfur compounds that can cause copper corrosion in transformers. The deposition on insulated windings is found to be more likely formed with an increase in DBDS concentration which changes the electrical properties of insulated windings dramatically. In this paper, three transformer insulating oils were prepared by adding with different DBDS concentrations in laboratory condition, subsequently a paper-wrapped copper winding model was immersed in oil followed by an accelerated thermal aging at 130°C. Spectrum analysis was adapted to determine the elements content that were deposited on the surface of insulating paper. A high resistance meter (keithley 6517B) was used simultaneously to test volume/surface resistivity of paperwrapped insulated windings which describes the frequency dependence of permittivity. The results showed that higher DBDS concentration in transformer insulating oil accelerated both the deposition on the surface of the insulating paper and on copper. Furthermore, the volume/surface resistivity decreased significantly. Our study examines the change of electrical properties of insulated winding. The results should be and beneficial to understand the sulfur corrosion mechanism in transformer oils.

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Development of Quantitative Evaluation of Copper Sulfide Deposition on Insulating Paper

Cited by 8 publications

References 2 publications

Reviews on sulphur corrosion phenomenon of the oil–paper insulating system in mineral oil transformer

Reviews on sulphur corrosion phenomenon of the oil–paper insulating system in mineral oil transformer

Formation of Corrosive Sulfur with Dibenzyl Disulfide in Fluid-Filled Transformers

The impact of corrosive sulfur concentration in transformer oil on the electrical properties of insulated windings

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