Influences of oxygen and 2,6-di-tert-butyl-p-cresol on copper sulfide deposition on insulating paper in oil-immersed transformer insulation

Copper sulfide deposition on cellulosic insulating materials in oil-immersed transformers was investigated by heating tests stipulated by IEC 62535 with controlled atmospheres to which mineral insulating oils were exposed. Both oxygen in the atmosphere and 2,6-di-tert-butyl-p-cresol (DBPC) in the oi...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2012-12, Vol.19 (6), p.1884-1890
Main Authors: Kawarai, H., Uehara, Y., Mizuno, K., Toyama, S., Nagao, E., Hosokawa, N., Amimoto, T.
Format: Article
Language:English
Subjects:
Absorption
Atmosphere
Chemical bonds
Copper
copper compounds
COPPER SULFIDE
Copper sulfides
DEPOSITION
Heating
Insulation
INSULATION (ELECTRICAL)
INSULATORS
oil insulation
OILS
oxygen
paper insulation
Photonics
Strips
SULFIDES
sulfur compounds
transformer oil
Transformers
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Summary:Copper sulfide deposition on cellulosic insulating materials in oil-immersed transformers was investigated by heating tests stipulated by IEC 62535 with controlled atmospheres to which mineral insulating oils were exposed. Both oxygen in the atmosphere and 2,6-di-tert-butyl-p-cresol (DBPC) in the oil were found to accelerate the copper sulfide deposition on the insulating paper when the oil contains dibenzyl disulfide (DBDS). The weight of copper sulfide deposition on the insulating paper was found to increase when the oxygen concentration was increased up to 20 volume %. X-ray absorption near edge structure (XANES) analysis was applied to study the chemical bonding state of copper atoms in copper deposits on the insulating paper for the first time. It can be clarified the copper deposits on the insulating paper are mainly Cu 2 S and small amounts of CuO are contained.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2012.6396944