ASTM D1524-15(2022)
(Test Method)Standard Test Method for Visual Examination of Used Electrical Insulating Liquids in the Field
Standard Test Method for Visual Examination of Used Electrical Insulating Liquids in the Field
SIGNIFICANCE AND USE
4.1 By use of this test method and Test Methods D1500 or D2129 the color and condition of a test specimen of electrical insulating liquid may be estimated during a field inspection, thus assisting in the decision as to whether or not the sample should be sent to a central laboratory for full evaluation. Cloudiness, particles of insulation, products of metal corrosion, or other undesirable suspended materials, as well as any unusual change in color may be detected.
SCOPE
1.1 This test method for visual examination is applicable to electrical insulating liquids that have been used in transformers, oil circuit breakers, or other electrical apparatus as insulating or cooling media, or both.
1.2 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.
1.3 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.
General Information
Relations
Standards Content (Sample)
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.
Designation: D1524 − 15 (Reapproved 2022)
Standard Test Method for
Visual Examination of Used Electrical Insulating Liquids in
the Field
This standard is issued under the fixed designation D1524; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope insulating liquid may be estimated during a field inspection,
thus assisting in the decision as to whether or not the sample
1.1 This test method for visual examination is applicable to
should be sent to a central laboratory for full evaluation.
electrical insulating liquids that have been used in
Cloudiness,particlesofinsulation,productsofmetalcorrosion,
transformers, oil circuit breakers, or other electrical apparatus
or other undesirable suspended materials, as well as any
as insulating or cooling media, or both.
unusual change in color may be detected.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Apparatus
responsibility of the user of this standard to establish appro-
5.1 Sample Container—The sample vessel from a color
priate safety, health, and environmental practices and deter-
comparitor, or a container in which light can be projected from
mine the applicability of regulatory limitations prior to use.
the bottom into the sample.
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5.2 Light—Alight source such as a pen light with a No. 222
ization established in the Decision on Principles for the
bulb.
Development of International Standards, Guides and Recom-
5.3 Cloth—Photographer’s focusing cloth.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
6. Procedure
2. Referenced Documents
6.1 Tyndall Beam Examination—Project a narrow focused
light beam from the pen light upward through the sample
2.1 ASTM Standards:
container, using the photographic focusing cloth to exclude
D1500 Test Method forASTM Color of Petroleum Products
extraneous light. Carefully examine the test specimen by
(ASTM Color Scale)
means of this light. A test specimen of good insulating liquid
D2129 Test Method for Color of Clear Electrical Insulating
will appear clean and bright. Haziness or cloudiness usually
Liquids (Platinum-Cobalt Scale)
denotes moisture in suspension or sludge. If the dielectric
strength is satisfactory, the cloudiness may be caused by
3. Summary of Test Method
oxidation products, in which case the neutralization number
3.1 The condition of the test specimen is estimated by
will probably be high and the interfacial tension low. Particles
observation of cloudiness, foreign particles, or suspended
of metals, insulation, carbon, and other matter will show up
matter in the sample by reflected light.
very markedly by reflected light. Report the electrical insulat-
ing liquid as failing the test if the appearance of any condition
...
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