Assessment of dibenzyl disulfide and other oxidation inhibitors in transformer mineral oils

Mehanna, N. A.; Jaber, A. M. Y.; Oweimreen, G. A.; Abulkibash, A. M.

doi:10.1109/tdei.2014.6832253

Cited by 28 publications

(18 citation statements)

References 14 publications

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“…The fact that the amount of oxygen is lower at 150°C compared to at 120°C coupled with the fact that peaks consistent with CuS 2 and S/R‐SH are greater at 150°C suggests that the molecule does break down to form small chain sulfur molecules. A number of studies have shown that oils containing dibenzyl disulfide, which contains a similar sulfur chain linkage to DMTD, cause severe copper corrosion because of the presence of the sulfur chain …”

Section: Resultsmentioning

confidence: 99%

“…A number of studies have shown that oils containing dibenzyl disulfide, which contains a similar sulfur chain linkage to DMTD, cause severe copper corrosion because of the presence of the sulfur chain. [16][17][18] Another noticeable difference is the change in the N1s spectra in Figure 9. The nitrogen species present is difficult to identify.…”

Section: Imaging and Chemical Analysis Of Coupon Surfacesmentioning

confidence: 95%

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Automatic transmission fluid corrosion inhibitor interactions with copper

Warren

Hunt²,

Bryant

et al. 2018

Lubrication Science

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In this paper, a new method, measuring the change in resistance of a thin copper wire, has been applied to provide a way to monitor a corrosion reaction in situ. Two different corrosion inhibitors used in commercial automatic transmission fluids have been studied at 110 °C, 120 °C, 130°C, and 150 °C using this new test method coupled with a more traditional coupon test to allow surface analysis to be carried out. Both inhibitors were found to be equally as effective up to temperatures of 130°C; however, the evidence provided shows that at 150°C, the thiadiazole inhibitor is breaking down leading to severe pitting on the surface. Corrosion performance therefore, cannot be assumed to be effective at all temperatures, and the current method provides a convenient quantitative screening method for inhibitor evaluation.

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Section: Resultsmentioning

confidence: 99%

Section: Imaging and Chemical Analysis Of Coupon Surfacesmentioning

confidence: 95%

Automatic transmission fluid corrosion inhibitor interactions with copper

Warren

Hunt²,

Bryant

et al. 2018

Lubrication Science

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“…The commonly used inhibitors are 2,6-di-tert-butyl-paracresol (DBPC) and 2,6-di-tert-butyl-phenol (DBP) [12]. In recent study, Mehanna et al [21] examined the characteristics of several inhibitors dissolved in mineral insulating oils including 2,6-di-tert-butyl-p-cresol (DBPC), 2,6-di-tert-butyl-phenol (DBP), dibenzyl disulfide (DBDS), 2-tert-butyl-p-cresol (2-t-BPC), N-phenyl-1-naphthylamine, 1,2,3-benzotriazol (BTA) and methylated-BTA. The obtained results confirmed that the DBPC and DBP are the most suitable to be used as inhibitors in transformer mineral oils.…”

Section: Inhibitor Contentmentioning

confidence: 99%

Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

et al. 2016

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Abstract:A power transformer outage has a dramatic financial consequence not only for electric power systems utilities but also for interconnected customers. The service reliability of this important asset largely depends upon the condition of the oil-paper insulation. Therefore, by keeping the qualities of oil-paper insulation system in pristine condition, the maintenance planners can reduce the decline rate of internal faults. Accurate diagnostic methods for analyzing the condition of transformers are therefore essential. Currently, there are various electrical and physicochemical diagnostic techniques available for insulation condition monitoring of power transformers. This paper is aimed at the description, analysis and interpretation of modern physicochemical diagnostics techniques for assessing insulation condition in aged transformers. Since fields and laboratory experiences have shown that transformer oil contains about 70% of diagnostic information, the physicochemical analyses of oil samples can therefore be extremely useful in monitoring the condition of power transformers.

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“…The origin of copper coils deterioration by corrosion has been attributed to sulfured species, particularly to both dibenzyl disulfide (DBDS) and benzyl sulfide (BS) [22][23][24][25] . These antioxidants are additives added to improve the tribological properties of the insulating mineral oils, present in the power devices 22,26 . In the corrosion process, the formation of copper (I) sulfide, Cu 2 S, and other organic secondary subproducts, such as dibenzyl sulfide and bibenzyl, have been described 22, 27-30 . Although, the passivator effect of BTAH has been described abundantly, aspects such as the adsorption nature over surface defects, the influence of the solvent, and the introduction of substituents in BTAH core acting as passivator, remain unclear.…”

Section: Introductionmentioning

confidence: 99%

1,2,3-Benzotriazole derivatives adsorption on Cu(1 1 1) surface: A DFT study

Saavedra-Torres

Escobar

Ocayo

et al. 2017

Chemical Physics Letters

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In the context of copper corrosion passivation, the adsorption of benzotriazole (BTAH) and its derivatives: 5-Methyl, 5-Amine, 1-Amine, 1-Methyl on a Cu(111) surface was investigated using periodic density functional (DFT) calculations. The results were contrasted with experimental ASTM protocols. Adsorption of BTAH and radical (BTA•) forms, as well as solvent effect were evaluated. The Cu-N interaction provides stable complexes with adsorption over top sites. Radical forms yielded more stable complex. Their adsorption energies correlate with the substituent position and electronic features. And finally, a strong interaction was obtained when the charge transfer goes from surface to adsorbate.

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Assessment of dibenzyl disulfide and other oxidation inhibitors in transformer mineral oils

Cited by 28 publications

References 14 publications

Automatic transmission fluid corrosion inhibitor interactions with copper

Automatic transmission fluid corrosion inhibitor interactions with copper

Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

1,2,3-Benzotriazole derivatives adsorption on Cu(1 1 1) surface: A DFT study

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