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Description of ASTM-D3284 2011ASTM D3284 - 05(2011)Standard Practice for Combustible Gases in the Gas Space of Electrical Apparatus Using Portable MetersActive Standard ASTM D3284 | Developed by Subcommittee: D27.03 Book of Standards Volume: 10.03 ASTM D3284Significance and Use
Arcing, partial discharge, and localized overheating in the insulation system of transformers result in chemical decomposition of the insulating oil and other insulating materials. This may generate various gases, some of which are combustible. Typically, gases are generated in the oil and then partitioned into the gas space according to their individual solubilities. Gases which are highly oil-soluble, such as acetylene, may not be in significant quantities in the gas space until an incipient fault has progressed to a very serious condition or failure of the transformer. Gases such as carbon monoxide and hydrogen which have low solubilities in oil can make up a large fraction of the combustible gases in the gas space. Detection of these gases is frequently the first available indication of a malfunction. Portable combustible gas meters are a convenient means of detecting the presence of generated gases. Normal operation of a transformer may result in the formation of some combustible gases. The detection of an incipient fault by this method involves an evaluation of the amount of combustible gases present, the rate of generation of these gases, and their rate of escape from the transformer. Refer to IEEE C57.104 for detailed information on interpretation of gassing in transformers. 1. Scope
1.1 This field practice covers the detection and estimation of combustible gases in the gas blanket above the oil or in gas detector relays in transformers using portable instruments. It is applicable only with transformers using mineral oil as the dielectric fluid. Gases dissolved in the oil and noncombustible gases are not determined. A method of calibrating the instruments with a known gas mixture is included. 1.2 This practice affords a semi-quantitative estimate of the total combustible gases present in a gas mixture. If a more accurate determination of the total amount of combustible gases or a quantitative determination of the individual components is desired, use a laboratory analytical method, such as Test Method D3612 . 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. Specific precautionary statements are given in Section 7. ASTM Standards D3612 Test Method for Analysis of Gases Dissolved in Electrical Insulating Oil by Gas Chromatography IEEE Standard C57.104 Guide for the Interpretation of Gases Generated in Oil-Immersed TransformersKeywords combustible gases; gas space; gases; portable meters; Combustible gases; Electrical insulating gases; Electrical insulating oils; Field testing--insulating oils; Gas content; Portable meters; Transformers; ICS Code ICS Number Code 13.320 (Alarm and warning systems) DOI: 10.1520/D3284-05R11 ASTM International is a member of CrossRef. ASTM D3284This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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