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Description of ASTM-D7150 2005ASTM D7150 - 05Standard Test Method for the Determination of Gassing Characteristics of Insulating Liquids Under Thermal Stress at Low TemperatureActive Standard ASTM D7150 | Developed by Subcommittee: D27.03 Book of Standards Volume: 10.03 ASTM D7150Significance and Use Generation of combustible gases is used to determine the condition of oil-filled electrical apparatus. Many years of empirical evidence has yielded guidelines such as those given in IEEE C57.104, IEC 60599 and IEC 61464. Industry experience has shown that electric and thermal faulted in oil-filled electrical apparatus are the usual sources that generate gases. Experience has shown that some of the gases could form in the oil at low temperatures or as a result of contamination, without any other influences. Some severely hydro-treated transformer oils subjected to thermal stress and oils that contain certain types of contamination may produce specific gases at lower temperatures than normally expected for their generation and hence, falsely indicate abnormal operation of the electrical apparatus. Some new oils have produced large amounts of gases, especially hydrogen, without the influence of other electrical apparatus materials or electrical stresses. This renders interpretation of the dissolved gas analysis more complicated. Heating for 164 h has been found to be a sufficient amount of time to reach a stable and characteristic gassing pattern. This method uses both dry air and dry nitrogen as the sparging gas. This is to reflect either a electrical apparatus preservation system that allows oxygen to contact the oil or one that is sealed from the outside atmosphere. Oils sparged with air generally produce much more hydrogen as a percentage of the total combustible gas content as compared to oils sparged with nitrogen as these produce more hydrocarbons in relation to hydrogen. 1. Scope 1.1 This test method describes the procedures to determine the low temperature (120C) gassing characteristics of insulating liquids specifically and without the influence of other electrical apparatus materials or electrical stresses. This test method was primarily designed for insulating mineral oil. It can be applied to other insulating liquids in which dissolved gas-in-oil analysis (Test Method D 3612) is commonly performed. 1.2 This test method is particularly suited for detection of the phenomenon sometimes known as 'stray gassing' and is also referred to in CIGRE TF11 B39. 1.3 This test method is performed on transformer insulating liquids to determine the propensity of the oil to produce certain gases such as hydrogen and hydrocarbons at low temperatures. 1.4 This test method details two procedures: 1.5 Method A describes the procedure for determining the gassing characteristics of a new, unused insulating liquid, as received, at 120C for 164 h. 1.6 Method B describes the procedure for processing the insulating liquid through an attapulgite clay column to remove organic contaminants and other reactive groups that may influence the gassing behavior of an insulating liquid, which is suspected of being contaminated. This procedure applies to both new and used insulating liquids. 1.7 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 to determine the applicability of regulatory limitations prior to use.
ASTM Standards D1933 Specification for Nitrogen Gas as an Electrical Insulating Material D3612 Test Method for Analysis of Gases Dissolved in Electrical Insulating Oil by Gas Chromatography D3613 Practice for Sampling Insulating Liquids for Gas Analysis and Determination of Water Content IEEE Document C 57.104 IEEE Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers, 1991Keywords combustible gases; DGA; dissolved gases; dissolved gas-in-oil; insulating oil; low temperature gassing characteristics; stray gassing; transformer oil, clay treatment; ICS Code ICS Number Code 29.040.01 (Insulating fluids in general) DOI: 10.1520/D7150-05 ASTM International is a member of CrossRef. ASTM D7150The following editions for this book are also available...This 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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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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