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Significance and Use
4.1 Electrical characteristics of an insulating liquid may be affected deleteriously by excessive water content. A high water content may make a dielectric liquid unsuitable for some electrical applications due to deterioration of properties such as the dielectric breakdown voltage.
1.1 This test method covers the measurement of water present in insulating liquids by coulometric Karl Fischer titration. This test method is used commonly for test specimens below 100 % relative saturation of water in oil. The coulometric test method is known for its high degree of sensitivity (typically 10 μg H2O). This test method requires the use of equipment specifically designed for coulometric titration.
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 practice and determine the applicability of regulatory limitations prior to use. For specific precautionary statements see 8.1 and A2.1.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D923 Practices for Sampling Electrical Insulating Liquids
IEC StandardIEC60814: Insulating Liquids--Oil-Impregnated Paper and Pressboard--Determination of Water by Automatic Coulometric Karl Fischer Titration American National Standards Institute, 11 West 42nd Street, New York, NY 10036-8002.
ICS Number Code 29.040.10 (Insulating oils)
UNSPSC Code 15121505(Transformer oil or insulating oil)
ASTM D1533-12, Standard Test Method for Water in Insulating Liquids by Coulometric Karl Fischer Titration, ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top