Experimental study of the role played by dibenzyl disulfide on insulating oil corrosivity-effect of passivator irgamet 39

Martins, Maria Augusta G.; Gomes, Ana

doi:10.1109/mei.2010.5511186

Cited by 31 publications

(13 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dibenzyl disulfide (DBDS) is the major cause of sulfur corrosion, which leads to the copper sulfide (Cu 2 S) formation in oil-immersed insulation [4]- [6]. The high-conductivity copper sulfide reduces the insulation and tracking resistance of oil-immersed insulation [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Mechanism for Copper Sulfide Formation Induced by Dibenzyl Disulfide in Oil-Immersed Insulation

2019

View full text Add to dashboard Cite

This paper investigated the influence of paper-wrapped on the deposition of sulfur corrosion on the insulation winding (paper-wrapped copper conductor) in oil-immersed insulation containing dibenzyl disulfide (DBDS). The distribution of sulfur corrosion deposit on a 500-kV electric reactor was investigated and analyzed, and the properties of oil were analyzed. Aging experiments were also conducted for oil-paper insulation with 500-mg/kg DBDS under IEC 62535 corrosion test condition. The corrosion degree of insulation winding was evaluated, and the properties of oil were also discussed. Results showed that the enwinding pattern of the insulating paper on the copper conductor affected the deposition distribution of copper sulfide to be an alternate appearance of a non-corroded crevice and a strip-shaped corrosion deposit on the copper conductor according to the results of field and laboratory. Furthermore, for the insulation winding, the increased number of paper layers on the copper conductor led to the aggravation of sulfur corrosion, prevented the diffusion of copper ions in the oil, and accelerated the formation of acids, which co-affected the properties of the oil. The enwinding of insulating paper on the copper conductor led to the appearance of a tiny crevice on the insulation winding, which is an important occurrence precondition of crevice corrosion. Finally, the mechanism underlying crevice corrosion for insulation winding was theorized as electrochemical corrosion leading to copper sulfide formation.

show abstract

Section: Introductionmentioning

confidence: 99%

Corrosion Mechanism for Copper Sulfide Formation Induced by Dibenzyl Disulfide in Oil-Immersed Insulation

2019

View full text Add to dashboard Cite

show abstract

“…It can be seen that as the aging time of the sample increases, a higher concentration of passivator is required to achieve complete protection against corrosion, which may be related to the acid value in the oil. As the aging time of the oil sample increases, the acid value in the oil increases [10], and the generated acid may destroy the protective film formed on the surface of the copper windings by the passivator. Therefore, for samples with a longer aging time, a higher concentration of passivator is required to achieve complete protection against corrosion.…”

Section: Protection Effect Of Passivator On Insulating Oil With Dmentioning

confidence: 99%

“…Wan et al [8], Sundara et al [9] and other scholars have found that the corrosion inhibition of the Irgamet 39 copper winding is also a film-forming type and the protective film is very strong, which is resistant to high temperatures and oxygen, thus improving the oxidation stability and dielectric loss factor of the sample oil. Martins and Gomes [10] found that when the concentration of Irgamet 39 in the oil is greater than 50 ppm, it can have a good corrosion inhibition effect and also improve the oxidation stability of the oil sample and reduce the sediment. Wan et al [11] and Qian et al [12] and others found that T551 can effectively reduce the copper content of transformer oil, which has a significant inhibitory effect on copper corrosion and oil aging.…”

Section: Introductionmentioning

confidence: 99%

Protective Performance of Different Passivators on Oil-Paper Insulation Containing Multiple Corrosive Sulphides

et al. 2019

View full text Add to dashboard Cite

The problem of sulfur corrosion has seriously affected the safe and stable operation of the power transformers. Currently, adding passivators into the transformer oil is the most effective method to suppress the problem. However, no explicit provisions have been made for the optimum concentration of the specific passivators. In this paper, the transformer oils with different corrosive sulfurs and different aging degrees were used to study the protective performance of three different passivators. By comparing the copper surface, the optimum concentrations for each passivators were acquired. Moreover, by testing the breakdown voltage, dielectric loss factor, volume resistivity, and moisture content of the insulating oil after adding passivators with the optimal concentration, the effect of three passivators on the oil quality was obtained. Results show that the three passivators have different protective performance on different types of corrosive sulfurs. Irgamet 39 has a better protective effect at lower concentrations than the other two. The protective effect of all three passivators on dodecyl mercaptan is poor, and a new type of passivator capable of protecting against dodecyl mercaptan needs to be developed. Moreover, the three passivators have different protection performance on the transformer oils with different aging degrees. The protective performance is poor especially for the oils with longer running years or passivators with lower concentrations. Among the three passivators, Irgamet 39 had the smallest impact on the oil quality, followed by T571 and then TTA. The above research can provide some references for guiding the passivator addition in actual projects and preventing the occurrence of sulfur corrosion failures.

show abstract

“…Such metal passivator have the suppressive effect on copper sulfide formation. Furthermore, some research shows that the mixture of metal passivator and inhibitor have a better performance than just used metal passivator or inhibitor alone [24][25][26][27][28][29][30][31][32][33][34].…”

Section: C． Metal Passivatormentioning

confidence: 99%

Summary of research on corrosive sulfur in oil-paper insulation system

Quan

Jun-xing

Hui-li

et al. 2014

2014 ICHVE International Conference on High Voltage Engineering and Application

View full text Add to dashboard Cite

Oil-paper insulation plays an important role in the internal insulation of power transformers.Aging of transformer insulation is a gradual procedure which can eventually threaten the safe operation of power transformers. During long-term operation of power transformers, oil-paper insulation is exposed to multiple stresses, including electrical, thermal, mechanical factors and so on. Lot of vigor is given to maintenance of the health of transformers in transmission system. Usually the reliability of power transformer is very high and is expected to have a long service life. But according to the recent report and observations, many transformers and reactors have failed prematurely due to the resultant formation of copper sulfide in the windings, which has attracted wide attention. In the past decade ,considerable amount of work has been carried out to understand the long term effects of corrosive sulfur in mineral insulating oils, which has been recognized as the culprit of failure of some shunt reactors and power transformers. However, the problem of copper corrosion is very complex because of the complicated existence of sulfur element in transformers. Depending on oil, there are many different sulfur compounds present in oil. Other components of transformer, like pressboard, paper, glue, gasket, contaminated oil deliver hose etc are all potential sources of sulfur of one form or the other, either independently or due their interaction with oil. It is not one single corrosive sulfur compound that is responsible for all corrosive sulfur issues. Therefore the main sources, detection method, corrosive mechanism, damage and suppression measures are still the puzzled research focus. This paper present a comparatively detailed summary of research status about this phenomenon, and some useful research proposals and findings are introduced as well.

show abstract

Experimental study of the role played by dibenzyl disulfide on insulating oil corrosivity-effect of passivator irgamet 39

Cited by 31 publications

References 1 publication

Corrosion Mechanism for Copper Sulfide Formation Induced by Dibenzyl Disulfide in Oil-Immersed Insulation

Corrosion Mechanism for Copper Sulfide Formation Induced by Dibenzyl Disulfide in Oil-Immersed Insulation

Protective Performance of Different Passivators on Oil-Paper Insulation Containing Multiple Corrosive Sulphides

Summary of research on corrosive sulfur in oil-paper insulation system

Contact Info

Product

Resources

About