DocumentCode :
11626
Title :
The minimum concentration of 1,2,3-benzotriazol to suppress sulfur corrosion of copper windings by DBDS in mineral transformer oils
Author :
Mehanna, N.A. ; Jaber, A.M.Y. ; Oweimreen, G.A. ; Abulkibash, A.M.
Author_Institution :
Chem. Dept., King Fahd Univ. of Pet. & Miner., Dhahran, Saudi Arabia
Volume :
22
Issue :
2
fYear :
2015
fDate :
Apr-15
Firstpage :
859
Lastpage :
863
Abstract :
The incubation criterion of the 62535 standard procedure of the International Electrochemical Commission (IEC) was modified to obtain the depletion profiles for different concentrations of each of 1,2,3-benzotriazol (BTA) and dibenzyl disulfide (DBDS) when both are present in a mineral oil matrix. Measurements on BTA concentrations ranging from 0 to of 70 mg L-1 show that its depletion profile after incubation for 72 h, at room temperature, and at 150°C in the presence and absence of a copper strip, is the same irrespective of the DBDS concentration. Similar measurements on DBDS at concentrations ranging from 10 to 300 mg L-1 show that identical depletion profiles are obtained as long as the BTA concentration is maintained in excess of 5 mg L-1. The results show that a minimum BTA concentration of 5 mg L-1 is needed to make the copper windings in contact with the mineral oil passive and in turn suppress their sulfur corrosion by DBDS.
Keywords :
IEC standards; corrosion; transformer oil; transformer windings; 1,2,3-benzotriazol; 62535 standard procedure; DBDS; IEC; International Electrochemical Commission; copper windings; dibenzyl disulfide; incubation criterion; mineral oil matrix; mineral transformer oils; sulfur corrosion; sulfur corrosion suppresion; Copper; Corrosion; Heating; Minerals; Oil insulation; Power transformer insulation; Copper; dibenzyl disulfide; metal passivators; mineral insulating oil; power transformers; sulfur corrosion;
fLanguage :
English
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/TDEI.2015.7076785
Filename :
7076785
Link To Document :
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