1.1 This test method describes the detection of excessive amount of corrosive sulfur (both inorganic and organic) in electrical insulating oils and the propensity of such oils to form deposits either on copper or in Kraft paper insulation (non-thermally upgraded cellulose). 1.2 This test method is designed to detect the presence of free sulfur and corrosive sulfur compounds by subjecting copper and Kraft paper insulation to contact with oil under prescribed conditions. 1.3 Although designed for mineral oil of petroleum origin and Kraft paper insulation, different insulating oils and other types of insulation can be used. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitation prior to use.
Corrosive Sulfur attack is a significant issue in our industry. A new test is being developed to determine the propensity of oil with corrosive sulfur to react and form copper sulfide on the copper but also in the paper insulation. It will mostl likely be adopted by the IEEE and users of transformers to protect them from failure due to corrosive sulfur
CCD; cover conductor deposition, reactive sulfur, copper rod, headspace vials
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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