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Improving the Performance of Transformer Oil Using Individual Sulfides

  • ELECTRICAL PART OF THERMAL AND NUCLEAR POWER PLANTS
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Abstract—

The stability of transformer oil against oxidation affects the operating reliability and the service life of oil-filled electrical equipment. To improve the performance of transformer oil, an IONOL antioxidant is added to the oil fractions during transformer oil’s production. The quality of this antioxidant is affected by organic sulfur compounds contained in sour oils. An investigation was carried out into the effect of individual sulfides, namely, decylcyclohexylsulfide and decylphenylsulfide, injected into transformer oil after adsorption treatment, TAp, on its stability against oxidation and the amount of air absorbed by oil in a 30 kV/cm strength electrical field. Sulfides were added to oil to attain their concentration as high as 1.0 wt %. It has been demonstrated that the amount of air absorbed by oil decreases at a sulfide concentration of 0.5% and the oil’s stability against oxidation in oil-filled electrical equipment at power facilities becomes better. Decylcyclohexylsulfide has been found to be a more effective oxidation inhibitor than decylphenylsulfide. At its optimal concentration, the amount of air absorbed by the transformer oil decreased by six times, the acid number by 8.33 times, the yield of volatile acids by 3.5 times, and the amount of formed deposit by ten times compared to the original oil.

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Authors and Affiliations

  1. Kazan State Power Engineering University, 420066, Kazan, Russia

    L. R. Gainullina & V. P. Tutubalina

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  1. L. R. Gainullina
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  2. V. P. Tutubalina
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Correspondence to L. R. Gainullina.

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Translated by T. Krasnoshchekova

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Gainullina, L.R., Tutubalina, V.P. Improving the Performance of Transformer Oil Using Individual Sulfides. Therm. Eng. 67, 185–188 (2020). https://doi.org/10.1134/S0040601520030039

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  • DOI: https://doi.org/10.1134/S0040601520030039

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