IEC 62535:2008

Title

Language: EN Insulating liquids - Test method for detection of potentially corrosive sulphur in used and unused insulating oil

Language: FR Liquides isolants - Méthode d'essai pour la détection du soufre potentiellement corrosif dans les huiles usagées et neuves

Abstract

Language: EN IEC 62535:2008 specifies a test method for detection of potentially corrosive sulphur in used and unused mineral insulating oil. Most recent failures due to corrosive sulphur are related to the formation of copper sulphide deposits in and on the surface of winding cellulosic paper. The test method uses a copper conductor, wrapped with one layer of paper, immersed in the oil and heated to evaluate the capability of the oil to yield copper sulphide and transfer it to paper layers. The growth of copper sulphide on bare copper may cause the presence of conductive particulates in the oil, which can act as nuclei for electrical discharge and may lead to a fault. Other test methods exist using a bare copper strip immersed in oil and heated to detect the corrosive behaviour of oil against copper. ASTM D1275 Method B is also used for this test and a modified procedure using low oil volumes is included in Annex A. Tests with and without paper are considered as complementary and may lead to different results.

Language(s)
Language: EN Language: FR
Edition
1.0
Date of issue
08.10.2008
TC 10
ICS Codes
29.040.10
Publication number
62535
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Mandatory Standard according current regulation Mandatory Standard according current regulation

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