EN 62535:2009

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling
5 Procedure
6 Inspection and interpretation
7 Repeatability and reproducibility
8 Report
Annex A (informative) - Copper strip method to detect corrosive
        and potentially corrosive sulphur in oil
Annex B (informative) - Analysis for copper sulphide on insulating
        paper by scanning electron microscope-energy dispersive
        X-ray spectrometry (SEM/EDX)
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

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.