Copper sulfide deposits in the insulation systems of power transformers decrease the dielectric properties of the insulation and therefore constitute a significant risk for the operation of power transformers. Disulfides, oxidized sulfur compounds, thiols, and elemental sulfur, which could be present in insulating oil, have been recognized as the sources of reactive sulfur responsible for copper sulfide formation. Selective liquid liquid extraction using N-methyl-2-pyrrolidone solvent was investigated for the purification of mineral insulating oils through the removal of compounds and precursors responsible for copper sulfide formation. The efficiency of the extraction process was evaluated using corrosive sulfur test IEC 62535, SEM/EDX measurements of paper before and after the IEC 62535 test, and measurements of the dibenzyl disulfide concentration in the oil using GC-ECD method. The oxidation stability of refined oils was evaluated using the IEC 61125 method. Precursors of copper su...lfide deposits were completely removed from different mineral oils as a result of purification by extraction with N-methyl-2-pyrrolidone and 1.0 wt % water as a cosolvent.
TY - JOUR
AU - Lukić, Jelena M.
AU - Nikolić, Draginja
AU - Mandić, Valentina
AU - Glišić, Sandra
AU - Antonović, Dušan
AU - Orlović, Aleksandar
PY - 2012
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2205
AB - Copper sulfide deposits in the insulation systems of power transformers decrease the dielectric properties of the insulation and therefore constitute a significant risk for the operation of power transformers. Disulfides, oxidized sulfur compounds, thiols, and elemental sulfur, which could be present in insulating oil, have been recognized as the sources of reactive sulfur responsible for copper sulfide formation. Selective liquid liquid extraction using N-methyl-2-pyrrolidone solvent was investigated for the purification of mineral insulating oils through the removal of compounds and precursors responsible for copper sulfide formation. The efficiency of the extraction process was evaluated using corrosive sulfur test IEC 62535, SEM/EDX measurements of paper before and after the IEC 62535 test, and measurements of the dibenzyl disulfide concentration in the oil using GC-ECD method. The oxidation stability of refined oils was evaluated using the IEC 61125 method. Precursors of copper sulfide deposits were completely removed from different mineral oils as a result of purification by extraction with N-methyl-2-pyrrolidone and 1.0 wt % water as a cosolvent.
PB - Amer Chemical Soc, Washington
T2 - Industrial & Engineering Chemistry Research
T1 - Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone
EP - 4477
IS - 12
SP - 4472
VL - 51
DO - 10.1021/ie300450e
ER -
@article{
author = "Lukić, Jelena M. and Nikolić, Draginja and Mandić, Valentina and Glišić, Sandra and Antonović, Dušan and Orlović, Aleksandar",
year = "2012",
abstract = "Copper sulfide deposits in the insulation systems of power transformers decrease the dielectric properties of the insulation and therefore constitute a significant risk for the operation of power transformers. Disulfides, oxidized sulfur compounds, thiols, and elemental sulfur, which could be present in insulating oil, have been recognized as the sources of reactive sulfur responsible for copper sulfide formation. Selective liquid liquid extraction using N-methyl-2-pyrrolidone solvent was investigated for the purification of mineral insulating oils through the removal of compounds and precursors responsible for copper sulfide formation. The efficiency of the extraction process was evaluated using corrosive sulfur test IEC 62535, SEM/EDX measurements of paper before and after the IEC 62535 test, and measurements of the dibenzyl disulfide concentration in the oil using GC-ECD method. The oxidation stability of refined oils was evaluated using the IEC 61125 method. Precursors of copper sulfide deposits were completely removed from different mineral oils as a result of purification by extraction with N-methyl-2-pyrrolidone and 1.0 wt % water as a cosolvent.",
publisher = "Amer Chemical Soc, Washington",
journal = "Industrial & Engineering Chemistry Research",
title = "Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone",
pages = "4477-4472",
number = "12",
volume = "51",
doi = "10.1021/ie300450e"
}
Lukić, J. M., Nikolić, D., Mandić, V., Glišić, S., Antonović, D.,& Orlović, A.. (2012). Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone. in Industrial & Engineering Chemistry Research
Amer Chemical Soc, Washington., 51(12), 4472-4477.
https://doi.org/10.1021/ie300450e
Lukić JM, Nikolić D, Mandić V, Glišić S, Antonović D, Orlović A. Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone. in Industrial & Engineering Chemistry Research. 2012;51(12):4472-4477.
doi:10.1021/ie300450e .
Lukić, Jelena M., Nikolić, Draginja, Mandić, Valentina, Glišić, Sandra, Antonović, Dušan, Orlović, Aleksandar, "Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone" in Industrial & Engineering Chemistry Research, 51, no. 12 (2012):4472-4477,
https://doi.org/10.1021/ie300450e . .
