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ASTM D6802-02

(Test Method)

Test Method for Determination of the Relative Content Of Dissolved Decay Products in Mineral Insulating Oils by Spectrophotometry

Test Method for Determination of the Relative Content Of Dissolved Decay Products in Mineral Insulating Oils by Spectrophotometry

SIGNIFICANCE AND USE
The content of dissolved decay products in insulating oils is made up of a variety of compounds, such as peroxides, aldehydes, ketones, and organic acids. Each of them is partially adsorbed on the large surface of paper insulation leading to the premature aging of power transformers. The relative assessment of byproduct formation, therefore, can be used as an indicator of the aging of the mineral oil.
SCOPE
1.1 This test method characterizes by spectrophotometry the relative level of dissolved decay products in mineral insulating oils of petroleum origin. While new oil is almost transparent to a monochromatic beam of light in the visible spectrum, the increasing concentration of dissolved decay products shift the absorbance curve to longer wavelengths.
1.2 This test method is applicable to compare the extent of dissolved decay products for oils in service. It can assess the effectiveness of used or stored oil purification during the reclamation process, as well.
1.3 The values stated in SI units are to be regarded as standard. The values stated in parentheses are provided for information only.
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 and health practices and to determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Jun-2002
ICS
71.040.50 - Physicochemical methods of analysis
Technical Committee
D27 - Electrical Insulating Liquids and Gases
Drafting Committee
D27.03 - Analytical Tests
Current Stage
Ref Project

Relations

Replaced By
ASTM D6802-02(2010) - Test Method for Determination of the Relative Content Of Dissolved Decay Products in Mineral Insulating Oils by Spectrophotometry (Withdrawn 2019)
Effective Date
15-Jun-2010

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ASTM D6802-02 - Test Method for Determination of the Relative Content Of Dissolved Decay Products in Mineral Insulating Oils by SpectrophotometryASTM D6802-02 - Test Method for Determination of the Relative Content Of Dissolved Decay Products in Mineral Insulating Oils by Spectrophotometry
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ASTM D6802-02 - Test Method for Determination of the Relative Content Of Dissolved Decay Products in Mineral Insulating Oils by Spectrophotometry
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6802–02
Test Method for
Determination of the Relative Content Of Dissolved Decay
Products in Mineral Insulating Oils by Spectrophotometry
This standard is issued under the fixed designation D6802; 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 UV-VIS scanning spectrophotometer. The instrument is first
zeroed with spectral grade heptane. The absorbance curve of
1.1 This test method characterizes by spectrophotometry the
oil is then recorded from 360 to 600 nm. Integration of the area
relative level of dissolved decay products in mineral insulating
under this curve indicates the numeric value of the dissolved
oils of petroleum origin. While new oil is almost transparent to
decay products in the oil sample. Because of the high sensi-
a monochromatic beam of light in the visible spectrum, the
tivity of spectral analysis, the deterioration of oil purity can be
increasing concentration of dissolved decay products shift the
assessed in the early stages of the decay process.
absorbance curve to longer wavelengths.
1.2 This test method is applicable to compare the extent of
5. Significance and Use
dissolved decay products for oils in service. It can assess the
5.1 The content of dissolved decay products in insulating
effectiveness of used or stored oil purification during the
oils is made up of a variety of compounds, such as peroxides,
reclamation process, as well.
aldehydes,ketones,andorganicacids.Eachofthemispartially
1.3 The values stated in SI units are to be regarded as
adsorbed on the large surface of paper insulation leading to the
standard. The values stated in parentheses are provided for
premature aging of power transformers. The relative assess-
information only.
ment of byproduct formation, therefore, can be used as an
1.4 This standard does not purport to address all of the
indicator of the aging of the mineral oil.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
6. Interferences
priate safety and health practices and to determine the
6.1 The condition of the oil specimen should be clear
applicability of regulatory limitations prior to use.
according to the requirement of Test Method D1524.
6.2 The oil specimen, therefore, should be filtered through
2. Referenced Documents
50-µm filter paper.
2.1 ASTM Standards:
D923 Practices for Sampling Electrical Insulating Liquids
7. Apparatus
D1524 Test Method for Visual Examination of Used Elec-
2 7.1 Recording UV-Visible Automated Spectrophotometer,
trical Insulating Oils of Petroleum Origin in the Field
capable of scanning the range between 360 and 600 nm is
D3487 Specification for Mineral Insulating Oil Used in
required. The software should permit the calculation of area
Electrical Apparatus
under the absorbance curve of the oil specimen.
3. Terminology
8. Reagents and Materials
3.1 Definitions of Terms Specific to This Standard:
8.1 Absorption Cuvettes—To determine the absorbance
3.1.1 aged oil, n—an oil that no longer complies with the
curve of a mineral insulating oil, two matched glass cuvettes
standard specifications for mineral insulating oils used in
having a path length of 1-cm 6 0.01-cm should be used.
electrical apparatus according to D3487.
8.2 Cuvette Filling Device—Adisposable plastic dropper of
4. Summary of Test Method 2-mL capacity is recommended; however, any other suitable
pipette may be used.
4.1 A test specimen of mineral insulating oil is placed in a
8.3 Petroleum Spirits, of 60–80°C boiling range.
10-mm path length glass cuvette, which is installed in an
8.4 Heptane, spectral grade.
9. Sampling
This test method is under the jurisdiction of Committee D27 on Electrical
Insulating Liquids and Gases and is the direct responsibility of Subcommittee
9.1 Obtain the oil sample in accordance with Practice D923.
D27.03 on Analytical Tests.
Current edition approved June 10, 2002. PublishedAugust 2002. DOI: 10.1520/
D6802-02.
Annual Book of ASTM Standards, Vol 10.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6802–02
10. Preparation of Apparatus 14.1.1 Repeatability—Repeatability measurements made in
one laboratory on three samples resulted in a coefficient of
10.1 Clean the cuvettes thoroughly with petroleum spirits.
variation of 2.8 %. At the 95 % confidence level, duplicate
10.2 Adjust the aut
...

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1.1 This test method describes the gas chromatographic determination of purity for 1,3-propanediol (PDO). This test method was originally developed to determine the purity of 1,3-propanediol used for the application as the freeze point depressant base fluid in formulated PDO engine coolants. Use of the method for purity of PDO for other applications may be viable.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.2.1 Exception—Inch-pound units (psi) are used in Table 1, Pressure Program, Options A and B.  
1.3 Review the current Material Safety Data Sheets (MSDS) for detailed information concerning toxicity, first aid procedures, and safety precautions.  
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.

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