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  • ASTM
    D2440-13 Standard Test Method for Oxidation Stability of Mineral Insulating Oil
    Edition: 2013
    $93.60
    Unlimited Users per year

Description of ASTM-D2440 2013

ASTM D2440 - 13

Standard Test Method for Oxidation Stability of Mineral Insulating Oil

Active Standard ASTM D2440 | Developed by Subcommittee: D27.06

Book of Standards Volume: 10.03




ASTM D2440

Significance and Use

4.1 The oxidation stability test of mineral transformer oils is a method for assessing the amount of sludge and acid products formed in a transformer oil when the oil is tested under prescribed conditions. Good oxidation stability is necessary in order to maximize the service life of the oil by minimizing the formation of sludge and acid. Oils that meet the requirements specified for this test in Specification D3487 tend to minimize electrical conduction, ensure acceptable heat transfer, and preserve system life. There is no proven correlation between performance in this test and performance in service, since the test does not model the whole insulation system (oil, paper, enamel, wire). However, the test can be used as a control test for evaluating oxidation inhibitors and to check the consistency of oxidation stability of production oils.

1. Scope

1.1 This test method determines the resistance of mineral transformer oils to oxidation under prescribed accelerated aging conditions. Oxidation stability is measured by the propensity of oils to form sludge and acid products during oxidation. This test method is applicable to new oils, both uninhibited and inhibited, but is not well defined for used or reclaimed oils.

Note 1 A shorter duration oxidation test for evaluation of inhibited oils is available in Test Method D2112 .
Note 2 For those interested in the measurement of volatile acidity, reference is made to IEC Method 61125. 2

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

IEC Publication

IEC 61125: 1992 Unused Hydrocarbon-Based Insulating Liquids--Test Methods for Evaluating the Oxidation Stability International Electrotechnical Commission. Available from American National Standards Institute, 25 W. 43rd St., 4th Floor, New York, NY 10036.

ASTM Standards

B1 Specification for Hard-Drawn Copper Wire

D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration

D974 Test Method for Acid and Base Number by Color-Indicator Titration

D2112 Test Method for Oxidation Stability of Inhibited Mineral Insulating Oil by Pressure Vessel

D2272 Test Method for Oxidation Stability of Steam Turbine Oils by Rotating Pressure Vessel

D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus


Keywords

acid; aging; electrical oil; insulating mineral oil; oxidation; sludge; stability; transformer ;


ICS Code

ICS Number Code 29.040.10 (Insulating oils)


DOI: 10.1520/D2440-13

ASTM International is a member of CrossRef.

ASTM D2440

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About ASTM

ASTM 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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