ASTM D3455-11(2019)

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: D3455 − 11 (Reapproved 2019)
Standard Test Methods for
Compatibility of Construction Material with Electrical
Insulating Oil of Petroleum Origin
This standard is issued under the fixed designation D3455; 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 D2413 Practice for Preparation of Insulating Paper and
Board Impregnated with a Liquid Dielectric
1.1 Thesetestmethodscoverscreeningforthecompatibility
D3487 Specification for Mineral Insulating Oil Used in
ofmaterialsofconstructionwithelectricalinsulatingoilforuse
Electrical Apparatus
in electrical equipment.
1.2 The values stated in SI units are to be regarded as
3. Significance and Use
standard. No other units of measurement are included in this
3.1 Themagnitudeofthechangesintheelectricalproperties
standard.
of the insulating oil are of importance in determining the
1.3 This standard does not purport to address all of the
contamination of the oil by the test specimen.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.2 Physical and chemical changes in the oil such as color,
priate safety, health, and environmental practices and deter-
interfacial tension and acidity, also indicate solubility or other
mine the applicability of regulatory limitations prior to use.
adverse effects of the test specimen on the oil.
1.4 This international standard was developed in accor-
3.3 Physical changes of the test specimen such as hardness,
dance with internationally recognized principles on standard-
swelling, and discoloration show the effect of the oil on the test
ization established in the Decision on Principles for the
specimen and are used to determine the suitability of the
Development of International Standards, Guides and Recom-
material for use in insulating oil.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3.4 A material meeting the criteria recommended does not
necessarily indicate suitability for use in electrical equipment.
2. Referenced Documents
Other properties must also be considered.Additionally, certain
2.1 ASTM Standards:
materials containing additives may meet the requirements of
D877 Test Method for Dielectric Breakdown Voltage of
these test methods, yet be unsatisfactory when subjected to
Insulating Liquids Using Disk Electrodes
longer term evaluations. Examples of such materials are
D924 Test Method for Dissipation Factor (or Power Factor)
polyvinyl chloride (PVC) based compounds, nylon and elasto-
and Relative Permittivity (Dielectric Constant) of Electri-
meric compounds.
cal Insulating Liquids
D971 Test Method for Interfacial Tension of Insulating
4. Apparatus
Liquids Against Water by the Ring Method
4.1 Sample-Handling Apparatus:
D974 Test Method for Acid and Base Number by Color-
4.1.1 Oven, forced-draft, adjustable to 100 6 1 °C, and a
Indicator Titration
drying oven, adjustable to 105 6 5 °C.
D1500 Test Method forASTM Color of Petroleum Products
(ASTM Color Scale) 4.1.2 Glass Containers, 1-L, fitted with glass or aluminum
foil covers.
NOTE 1—Other materials have been found to be suitable as covers.
These test methods are under the jurisdiction of ASTM Committee D27 on
Electrical Insulating Liquids and Gases and are the direct responsibility of
4.2 Sample-Testing Apparatus:
Subcommittee D27.06 on Chemical Test.
Current edition approved Dec. 1, 2019. Published December 2019. Originally
4.2.1 Tensile Strength—As specified in appropriate test
approved in 1975. Last previous edition approved in 2011 as D3455 – 2011. DOI:
method.
10.1520/D3455-11R19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 4.2.2 Hardness—As specified in appropriate test method.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.2.3 Dimensional Change—Micrometer and caliper.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.2.4 Weight Change—Analytical balance.
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D3455 − 11 (2019)
5. Preparation of Test Specimen 7. Procedure
7.1 With a pair of clean tongs remove the test specimen
5.1 Test specimen size shall be such that the ratio of surface
from the oil, observe the condition, and conduct any desired
area to oil volume is four times as large as the ratio encoun-
test on the material.
teredinnormaluseinelectricalequipmentunlessthereissome
7.1.1 Typical tests on materials can include swelling or
special reason for using a different ratio (Note 2). Some
suggested ratios are as follows: dimensional change, hardness, discoloration, brittleness, etc.
7.1.2 For comparative tests use the appropriate method.
5.1.1 If the test specimen can be measured, no less than 52
cm are used with each 800 mL of oil.
7.2 The following tests on all oil specimens are suggested:
5.1.2 If the test specimen is insoluble in oil and the surface
7.2.1 Interfacial Tension—Test Method D971.
area cannot be measured, the test specimen shall be used in the
7.2.2 Neutralization Number—Test Method D974.
amount of 1 % by the weight of the oil.
7.2.3 Dielectric Strength—Test Method D877.
5.1.3 If the material is soluble in the oil, the test specimen
7.2.4 Dissipation (Power Factor)—Test Method D924.
shall be used in the amount of 0.5 % by the weight of the oil.
7.2.5 Color—Test Method D1500.
5.1.4 Varnishes and materials used as
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