Suppressive mechanism of the passivator irgamet 39 on the corrosion of copper conductors in transformers

Wan, Tao; Qian, Hui; Zhou, Zhiyuan; Gong, Shengkai; Hu, Xuefeng; Feng, Bing

doi:10.1109/tdei.2012.6180238

Cited by 37 publications

(22 citation statements)

References 13 publications

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“…Traditionally, mineral oils [1] are used as the electroinsulating fluid in the transformers, a strong biodegradable petroleum derivative [2], which, although having acceptable physical and dielectric characteristics and a relatively low cost, has a number of disadvantages such as: limited thermal stability [3][4][5][6][7][8], corrosive aggressivity due to sulfur content [8][9][10][11][12][13][14][15][16][17], reduced compatibility with the cellulose from Kraft paper -furanic products formation [18][19][20][21][22], relatively low flammability (below 150 o C) and excessive flammable gases formation [30] (high risk of explosions and devastating fires), etc. To increase thermal stability and to reduce the corrosive aggressiveness of electro-insulating oils, manufacturers often use antioxidant additives and / or corrosion inhibitors [15][16][17]31].…”

mentioning

confidence: 99%

Thermooxidative Behavior of Some Paint Materials in Natural Ester Based Electro-insulating Fluid

Lungulescu¹,

Lıngvay²,

Ungureanu³

et al. 2018

Mat.Plast.

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ATR / FTIR and DSC techniques have been used to evaluate the thermal stability of some ageing paint materials by heat treatment while immersion in natural ester-based electro-insulating oil. Experimental determinations have highlighted the fact that the investigated paint materials (epoxy resins) have a high oxygen affinity and thus, in closed systems (such as power transformers), they oxidize before coming into contact with the transformer oil. This behavior indicates that the paint layer (suitably chosen) applied on the inside of the transformer vat functions as an antioxidant and results in increasing the thermal stability of the oil.

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mentioning

confidence: 99%

Thermooxidative Behavior of Some Paint Materials in Natural Ester Based Electro-insulating Fluid

Lungulescu¹,

Lıngvay²,

Ungureanu³

et al. 2018

Mat.Plast.

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“…In addition to carbon and hydrogen, sulfur is the third most abundant element, ranging from a few parts per million to as much as five percent. The active sulfides are easy to react with metal parts of equipment to produce cuprous sulfide [1,2], causing partial discharges in electrical equipment and eventually serious insulation accidents. According to current studies by scholars, the source of corrosive sulfurs in insulating oil exist mainly four forms: (1) Corrosive sulfur contained in crude oil, (2) sulfur contained in electrical equipment, (3) corrosive sulfur compounds generated by crude oil pyrolysis reaction, and (4) corrosive sulfur compounds produced by hydrogenation reactions [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The active sulfides are easy to react with metal parts of equipment to produce cuprous sulfide [1,2], causing partial discharges in electrical equipment and eventually serious insulation accidents. According to current studies by scholars, the source of corrosive sulfurs in insulating oil exist mainly four forms: (1) Corrosive sulfur contained in crude oil, (2) sulfur contained in electrical equipment, (3) corrosive sulfur compounds generated by crude oil pyrolysis reaction, and (4) corrosive sulfur compounds produced by hydrogenation reactions [3,4]. In the past few decades, the sulfide deposition phenomenon was discovered successively in transformer fault inspections of 220 kV and above voltage classes in areas within China Southern Power Grid, East China, and North China [5,6].…”

Section: Introductionmentioning

confidence: 99%

Study on Sulfide Distribution in the Operating Oil of Power Transformers and Its Effect on the Oil Quality

Cong

Zhang

2018

Applied Sciences

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Corrosive sulfides in transformer oil could react with copper wire to produce cuprous sulfide, causing insulation failure. At present, both the quantitative measurement method and distribution of sulfur components in operating oil are not clear yet. In this paper, the existing types and contents of sulfides in oil samples with different alkyl groups and different voltage levels were investigated. With quantitative testing methods, the distribution of sulfur composition in the operating oil was analyzed. Results showed that the thiophene sulfide in transformer oil existed mainly in the form of benzothiophene with an unsaturation of 6 and dibenzothiophene with an unsaturation of 9. The content of monosulfide sulfide with unsaturation of 3 or 6 was the highest. The disulfide existed basically in the form of Dibenzyl disulfide (DBDS). The influence of sulfides on the oil quality were analyzed on this basis. Results showed that the existence of sulfides would increase the moisture content in oil. The absorbed moisture could cause the decrease of the breakdown voltage and rise of the dielectric loss. The above study could provide some engineering practice for understanding the sulphide distribution in transformer oils and further prevent the sulfur corrosion faults.

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“…Empirical studies reported effective corrosion inhibition even under the worst simulated operational conditions [16,31]. On the other hand, others concluded that the same severe thermal conditions that promote the formation of the corrosion by-products (i.e.…”

Section: Introductionmentioning

confidence: 99%

Static secondary ion mass spectrometry investigation of corrosion inhibitor Irgamet ® 39 on copper surfaces treated in power transformer insulating oil

et al. 2015

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Static secondary ion mass spectrometry was used to study the corrosion inhibitor Irgamet®39 on the surface of copper treated in insulating oils and the effect of temperature changes, by means of temperature programmed desorption experiments under vacuum, on metal coverage. Four commercial oils, both corrosive and noncorrosive, showed no significant influence on the stability of the tolyltriazole layer and the energy of its main desorption event from copper was calculated around 100 kJ mol -1 . Finally, an example of ion imaging as diagnostic tool to track the distribution of corrosion inhibitor and by-products in decommissioned or failed power transformers is described. HighlightsSSIMS was used to study corrosion inhibition of copper treated in insulating oil.Desorption experiments allowed the study of the inhibitor stability in vacuum.The energy of desorption of tolyltriazole under SSIMS conditions was calculated.SSIMS imaging was shown to be an applicable new diagnostic tool for transformers.

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Suppressive mechanism of the passivator irgamet 39 on the corrosion of copper conductors in transformers

Cited by 37 publications

References 13 publications

Thermooxidative Behavior of Some Paint Materials in Natural Ester Based Electro-insulating Fluid

Thermooxidative Behavior of Some Paint Materials in Natural Ester Based Electro-insulating Fluid

Study on Sulfide Distribution in the Operating Oil of Power Transformers and Its Effect on the Oil Quality

Static secondary ion mass spectrometry investigation of corrosion inhibitor Irgamet ® 39 on copper surfaces treated in power transformer insulating oil

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