The minimum concentration of 1,2,3-benzotriazol to suppress sulfur corrosion of copper windings by DBDS in mineral transformer oils

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

doi:10.1109/tdei.2015.7076785

Cited by 10 publications

(7 citation statements)

References 13 publications

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“…Table 4 presents the ANOVA results. Additionally, a regression model was formulated as per (1) and displayed in (2). This model represents the surface resistivity as a function of the oil temperature (variable: x1; unit: °C), elemental sulfur concentration (variable: x2; unit: ppm), and aging time (variable: x3; unit: days).…”

Section: Anova Resultsmentioning

confidence: 99%

“…Transformer corrosion has become more likely in recent years due to the increased presence of sulfur. To prevent and reduce the damage caused by sulfur corrosion on transformers [1], [2], scholars have conducted extensive research worldwide on the mechanism of corrosive sulfide and its effects  ISSN: 2252-8792 Int J Appl Power Eng, Vol. 13, No.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the effects of corrosion parameters on the surface resistivity of transformer’s insulating paper using a two-level factorial design

Azlan,

Ghani,

Khiar

et al. 2024

IJAPE

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The integrity of the insulation in oil-filled power transformers, shunt reactors, and high voltage bushings can be affected when copper dissolves in the insulating oil and then deposits onto the paper insulation. The presence of dissolved copper in the oil increases dielectric losses, while copper deposition significantly improves the conductivity of the paper insulation. Various factors, including temperature, oxygen, sulfur groups, passivators, and ageing time, have been found to contribute to the acceleration of corrosion activity in transformer insulating oils. Unfortunately, there is a lack of extensive research focused on systematically analysing and measuring the impact of corrosion-related factors on the dissolution of copper in transformer insulating oils and the deposition of copper onto solid insulation surfaces (Kraft paper). Therefore, this study aims to thoroughly examine the effects of corrosion factors on copper and sulfur deposition on Kraft paper insulation when it is submerged in transformer mineral oil (TMO). Using a two-level (2k) factorial design, we investigated three crucial factors: i) oil temperature, ii) elemental sulfur concentration, and iii) ageing time. It is worth mentioning that the results obtained from the two-level factorial design indicate that the surface resistivity is primarily affected by the temperature of the oil. This factor alone explains a significant 38.68% of the observed variation. In order to improve predictability, a regression model was created to estimate the surface resistivity of TMO-impregnated paper insulation. This model takes into account factors such as oil temperature, elemental sulfur concentration, and ageing time.

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Section: Anova Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating the effects of corrosion parameters on the surface resistivity of transformer’s insulating paper using a two-level factorial design

Azlan,

Ghani,

Khiar

et al. 2024

IJAPE

View full text Add to dashboard Cite

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“…Much work has been done to investigate the generation of the Cu 2 S and its influence on oil-paper insulation, including failures which triggered by corrosive products [3]- [9]. Many effective methods have been used to avoid sulfur corrosion of copper winding in oil-immersed power transformers and reactors [7], [10]- [12]. However, failures of high voltage bushing, another key part of oilimmersed power equipment, caused by corrosive sulfur has gradually appeared in recent years [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

“…But the work has barely been reported for the study of sulfur corrosion in bushing. Only several decades ago, the effect of the temperature and electrical field for sulfur corrosion in high voltage bushing was discussed [10].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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Failures of bushing caused by corrosive sulfur has gradually appeared in recent years. Apart from copper and sulfur, certain amount of aluminum was also found both in oil and paper after disassembling. The corrosion mechanism of the aluminum foil and its effect on oil-paper insulation were unknown. In this study, series of sulfur corrosion experiments were taken to investigate the sulfur corrosion of aluminum foil. The results showed the aluminum foil could certainly be corroded in oil containing corrosive sulfur (DBDS). Thermal products of insulting paper triggered the corrosion by removing the alumina film on the surface. Then, the contact corrosion occurred between aluminum and DBDS. In addition, the mechanisms of corrosion products generation both in oil and on paper were studied. The corrosion products in oil was 4) and that on paper was RCOOAl n . It caused the decrease of electrical properties of oil-paper. Particularly, the dielectric loss of oil and paper were dramatically enhanced.

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“…Some methods have been applied to prevent windings from sulfur corrosion. Triazole-based metal passivators such as 1,2,3-benzotriazole (BTA) and Irgamet 39 TM (CIBA Specialty, Basel, Switzerland) are most commonly used in insulating oils [11]. By forming an impermeable complex layer on the surface of copper, the passivator can delay the reaction between copper and DBDS [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Removal of Dibenzyl Disulfide (DBDS) by Polyethylene Glycol Sodium and Its Effects on Mineral Insulating Oil

Dong

Yang

et al. 2019

IEEE Access

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Dibenzyl disulfide (DBDS) is the major corrosive sulfur compound in mineral insulating oils, which will corrode the copper wires of windings in the oil-immersed power transformers and reactors and eventually cause operation failures. This paper studies the method to eliminate DBDS in insulation oils using the Polyethylene Glycol Sodium (Na-PEG) reagent. The preparation method of the Na-PEG reagent from NaOH and polyethylene glycol 400 is studied in the laboratory. The effect of the Na-PEG reagent dosage and reaction temperature on eliminating DBDS in insulating oils is studied, and a treatment process is recommended. An automatic processing device to remove DBDS from the transformer oil is developed, and the short-term electrical properties and long-term thermal stability of the insulating oil after the Na-PEG reagent treatment are tested. The results show that the Na-PEG reagent can efficiently eliminate DBDS in the insulating oil (the DBDS concentration decreases from 448 mg/kg to less than 5 mg/kg (undetectable) within 1 hour) and will not significantly negatively affect the oil properties such as the breakdown strength at the power frequency, dissipation factor or acidity. A preliminary exploration of the reaction mechanism is explored.

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The minimum concentration of 1,2,3-benzotriazol to suppress sulfur corrosion of copper windings by DBDS in mineral transformer oils

Cited by 10 publications

References 13 publications

Investigating the effects of corrosion parameters on the surface resistivity of transformer’s insulating paper using a two-level factorial design

Investigating the effects of corrosion parameters on the surface resistivity of transformer’s insulating paper using a two-level factorial design

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

Removal of Dibenzyl Disulfide (DBDS) by Polyethylene Glycol Sodium and Its Effects on Mineral Insulating Oil

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