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Significance and Use
Oil and oil-immersed electrical insulation materials may decompose under the influence of thermal and electrical stresses, and in doing so, generate gaseous decomposition products of varying composition which dissolve in the oil. The nature and amount of the individual component gases that may be recovered and analyzed may be indicative of the type and degree of the abnormality responsible for the gas generation. The rate of gas generation and changes in concentration of specific gases over time are also used to evaluate the condition of the electric apparatus.
Note 1—Guidelines for the interpretation of gas-in-oil data are given in IEEE C57.104.
1.1 This test method covers three procedures for extraction and measurement of gases dissolved in electrical insulating oil having a viscosity of 20 cSt (100 SUS) or less at 40°C (104°F), and the identification and determination of the individual component gases extracted. Other methods have been used to perform this analysis.
1.2 The individual component gases that may be identified and determined include:
1.3 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 limitations prior to use. For specific warning statements see 6.1.8, 30.2.2 and 30.3.1.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D2140 Practice for Calculating Carbon-Type Composition of Insulating Oils of Petroleum Origin
D2300 Test Method for Gassing of Electrical Insulating Liquids Under Electrical Stress and Ionization (Modified Pirelli Method)
D2779 Test Method for Estimation of Solubility of Gases in Petroleum Liquids
D2780 Test Method for Solubility of Fixed Gases in Liquids
D3613 Practice for Sampling Insulating Liquids for Gas Analysis and Determination of Water Content
D4051 Practice for Preparation of Low-Pressure Gas Blends
E260 Practice for Packed Column Gas Chromatography
IEEE StandardC57.104 Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers Available from IEEE, 345 E. 47th St., New York, NY 10017.
IEC StandardPublicationNo.567 Guide for the Sampling of Gases and of Oil from Oil-Filled Electrical Equipment and for the Analysis of Free and Dissolved Gases Available from International Electrotechnical Commission (IEC), 3 rue de Varemb, Case postale 131, CH-1211, Geneva 20, Switzerland, http://www.iec.ch..
ICS Number Code 29.040.10 (Insulating oils)
UNSPSC Code 15121505(Transformer oil or insulating oil)