This International Standard 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
DS/EN 62535:2009 history
2009DS/EN 62535:2009 Insulating liquids - Test method for detection of potentially corrosive sulphur in used and unused insulating oil