Study regarding corrosiveness and thermal stability of some insulating oils in contact with red cooper and S235J2G3 carbon steel

Voina, Andreea; Radu, Elena; Mitrea, Sorina; Oprina, Gabriela; Lıngvay, Iosif; Serban, Florentina; Pica, Alexandra

doi:10.1109/demisee.2016.7530462

Cited by 7 publications

(14 citation statements)

References 7 publications

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“…Under the practical conditions of operation, under the synergic action of thermal and electric stress, complex interactions between the components of the system leads to a series of processes such as: degradation of electroinsulating paper [1][2][3][4][5][6][7][8][9][10][11], corrosion of metal components, especially copper, with the formation of the products of corrosion that substantially reduces the insulation resistance and dielectric rigidity of the electro-insulating fluid [12][13][14][15][16][17][18][19], the formation of furans products (toxic products determined and monitored by various techniques) [3,8,[20][21][22][23], formation of the inert gases such as CO 2 as well as flammable as H 2 , CH 4 , C 2 H 4 , C 2 H 6 etc. [24][25][26][27][28][29][30][31][32][33][34].…”

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confidence: 99%

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Studies on the Behavior Some Paints in Electro-insulating Fluid Based on Vegetable Esters

Lıngvay¹,

Bors²,

Ungureanu³

et al. 2018

Rev. Chim.

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For the purpose of using three different types of painting materials for the inner protection of the transformer vats, their behavior was studied under actual conditions of operation in the transformer (thermal stress in electro-insulating fluid based on the natural ester in contact with copper for electro-technical use and electro-insulating paper). By comparing determination of the content in furans products (HPLC technique) and gases formed (by gas-chromatography) in the electro-insulating fluid (natural ester with high oleic content) thermally aged at 130 �C to 1000 hours in closed glass vessels, it have been found that the presence the investigated painting materials lead to a change in the mechanism and kinetics of the thermo-oxidation processes. These changes are supported by oxygen dissolved in oil, what leads to decrease both to gases formation CO2, CO, H2, CH4, C2H4 and C2H6) and furans products (5-HMF, 2-FOL, 2 -FAL and 2-ACF). The painting materials investigated during the heat treatment applied did not suffer any remarkable structural changes affecting their functionality in the electro-insulating fluid based on vegetable esters.

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confidence: 99%

“…Several studies [2,4,13,15,17,19,30,33] have highlighted that the copper components of the transformer after thermal oxidation form Cu 2 O films with catalytic effect [35,36] on the processes formation the gases by decomposing the electro-insulating fluid.…”

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confidence: 99%

Studies on the Behavior Some Paints in Electro-insulating Fluid Based on Vegetable Esters

Lıngvay¹,

Bors²,

Ungureanu³

et al. 2018

Rev. Chim.

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“…It should be underlined that, further to the thermooxidative ageing of the oil transformers [40][41][42][43][44][45][46] and the degradation of the electro insulating paper, highly determined by the dissolved oxygen and the humidity of the oil transformer, several toxic furfural products [47][48][49][50] and / or of flammable gases are produced [51][52][53][54][55][56][57][58] which may lead to the explosion of the oil transformer followed by devastating wildfires [55,57].…”

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confidence: 99%

Ageing of Some Painting Materials Subjected to Thermal Treatment in Natural Esters

Rus¹,

Caramitu²,

Ungureanu³

et al. 2018

Mat.Plast.

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This paper describes the evaluation of the aging process of some polymeric painting materials subjected to a thermal treatment in electro insulating fluids, based on natural esters (vegetable oils). The paint layers surface morphology was comparatively characterized by FESEM technique, prior to the exposure, and after 1000 h of exposure to vegetable oil, heated at 130oC. The results show a substantial increase in the pulling resistances for all the painting materials subjected to this investigation, especially in the presence of the Kraft insulating paper and copper foil (inserted compulsory to emulate the actual working environment), due to an increase in the painting material adhesion, as well as an increase of the tensile strength of the paint layer. These findings may open new theoretical and practical research prospects, particularly in the field of preliminary treatments for materials used for heavy duty industrial transformers.

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“…Although the mineral insulating oils have a high quality to price ratio, they also present a series of disadvantages such as: low biodegradability [4,5], due to their sulphur content they corrode the metallic parts (particularly copper) and the corrosion products (sulphides) significantly reduce the transformer insulation [6][7][8][9][10][11], relatively low fire point (below 150 0 C), degrades the insulation paper with furans and gas formation [12][13][14], relatively low thermal stability [3,[15][16][17][18][19] etc.…”

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confidence: 99%

“…The ageing of insulating oils is determined by the dissolved oxygen content of the oil due to thermo-oxidative processes [10,15,18,19], followed by the formation of a series of gaseous degradation products such as CO, CO 2 , CH 4 , C 2 H 4 , C 2 H 6 etc., which leads to an increase in oil viscosity. The gas content of the insulating oils represents a good indicator of the oil ageing degree.…”

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confidence: 99%

Studies on the Influence of Copper and Insulation Paper on the Accelerated Thermal Ageing of Some Insulating Fluids

Lıngvay¹,

Oprina²,

Stanoi³

et al. 2017

Rev. Chim.

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The behaviour of some insulating fluids in contact with copper foil and / or insulation paper under thermal stress (110�30C for 1000 hours), in a closed system (the access of atmospheric oxygen being limited), has been studied by determining the changes in viscosity and concentration of CO2 and CO. The experimental data revealed that, following the applied heat treatment, the change in viscosity of the esters-based insulating fluids (both synthetic and vegetable) is approximately 7 times lower than in the case of the investigated mineral oils. It has also been found that, following the thermal ageing, the gas content of the mineral oils is substantially higher than in the esters-based oils (8 times higher for CO2 and 4 times higher for CO, respectively). The experimental results indicate superior values for the thermal stability and compatibility with the insulation paper of ester-based insulating fluids.

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Study regarding corrosiveness and thermal stability of some insulating oils in contact with red cooper and S235J2G3 carbon steel

Cited by 7 publications

References 7 publications

Studies on the Behavior Some Paints in Electro-insulating Fluid Based on Vegetable Esters

Studies on the Behavior Some Paints in Electro-insulating Fluid Based on Vegetable Esters

Ageing of Some Painting Materials Subjected to Thermal Treatment in Natural Esters

Studies on the Influence of Copper and Insulation Paper on the Accelerated Thermal Ageing of Some Insulating Fluids

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