ASTM-D2759 › Standard Practice for Sampling Gas from a Transformer Under Positive Pressure
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Scope
1.1 This practice covers the sampling of gas above the insulating liquid of a transformer. A gas sampling bottle collects the gas sample from the gas space that is at a positive pressure.
1.2 Representative samples of gas are taken for analysis to determine their compositions.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Significance and Use
2.1 A gas sample from above the insulating liquid in transformers and other electrical power apparatus can be used to give an early indication of developing fault conditions. Combustible gases are formed from the breakdown of the insulating materials under thermal and electrical stress. Excessive concentrations of combustible gases indicate the need to take appropriate action.
2.2 It is important that gas samples from equipment be taken from the gas space directly above the liquid level, and not from remote expansion compartments, such as tank bracing bands.
2.3 The procedure described should be carefully followed to ensure that the sample is not diluted by air or nitrogen, or contaminated by residual materials in the sampling bottle.
Keywords
gas; positive pressure; sampling gas; transformer ;; ICS Number Code 29.180 (Transformers. Reactors)
To find similar documents by ASTM Volume:
10.03 (Electrical Insulating Liquids and Gases; Electrical Protective Equipment)
To find similar documents by classification:
29.180 (Transformers. Reactors Instrument transformers, see 17.220.20)
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Document Number
ASTM-D2759-00(2017)
Revision Level
2000 R17 EDITION
Status
Current
Modification Type
Reapproval
Publication Date
Oct. 15, 2017
Document Type
Practice
Page Count
2 pages
Committee Number
D27.07