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ASTM

ASTM D3255-75

(Test Method)

Method for Investigating the Compatibility of Transformer Insulation and Construction Materials in Askarels (Withdrawn 1979)

Method for Investigating the Compatibility of Transformer Insulation and Construction Materials in Askarels (Withdrawn 1979)

General Information

Status
Withdrawn
Technical Committee
D27 - Electrical Insulating Liquids and Gases
Drafting Committee
D27.02 - Gases and Non-Mineral Oil Liquids
Current Stage
Ref Project

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ASTM D3255-75 - Method for Investigating the Compatibility of Transformer Insulation and Construction Materials in Askarels (Withdrawn 1979)ASTM D3255-75 - Method for Investigating the Compatibility of Transformer Insulation and Construction Materials in Askarels (Withdrawn 1979)
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ASTM D3255-75 - Method for Investigating the Compatibility of Transformer Insulation and Construction Materials in Askarels (Withdrawn 1979)
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~~l~ Designation: D 3255 - 75
Standard Method for
INVESTIGATING THE COMPATIBILITY OF
TRANSFORMER INSULATION AND
1
CONSTRUCTION MATERIALS IN ASKARELS
This Standard is issued under the fixed designation D 3255; 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
reapprova].
2
I. Scope
Constant of Electrical Insulating Liquids
D 1533 Test for Water in Insulating Liquids
I. I This method uses the change of electrical
(Karl Fischer Method)'
or chemical characteristics, or both, of trans­
D 2129 Test for Color of Chlorinated Aro­
former askarel resulting from controlled expo­
2
matic Hydrocarbons (Askarels)
sure to insulation and construction materials, to
D 2283 Specification for Chlorinated Aro­
evaluate their immediate major contamination
matic Hydrocarbons (Askarels) for Trans­
effect on the askarel fluid. Delayed or long-time
formers2
contamination: effects may not be detected.
Refer to Specification D 2283 for the definition
3. Summary of Method
of askarel.
3.1 Properly proportioned specimens of the
1.2 This method also utilizes various physi­
insulation or structural materials are immersed
cal tests on the electrical insulation and con­
in refined askarel for 168 hat 100 ± 1° Cina
struction materials after controlled exposure to
forced-draft oven. ·Changes in electrical and
the askarel to help in determining the compati­
chemical properties of the transformer askarel
bility of these materials with transformer as­
are compared against a control sample of the
karel.
askarel treated in the same manner, in absence
1.3 This method is not suitable for the
of the test specimens.
complete evaluation of the askarel-structural­
3.2 Color change or intensification beyond
insulating material system combination for any
that of the control indicates that the askarel has
given applicaticn. Other methods much more
extracted colored materials from the insulation
complex, which are beyond the scope of this
method, should be used for such an evaluation. or structural components or, the combination
may have degraded the askarel.
1.4 Suggested limits for judging compatibil­
3.3 Physical properties of the materials of
ity of materials are outlined in 8.4.
insulation and construction are determined be­
2. Applicable Documents
fore and after exposure to the askarel fluid.
2.1 ASTM Standards:
4. Significance
D 150 Tests for A-C Loss Characteristics
4.1 The interaction of transformer askarel
and Dielectric Constant (Permittivity) of
2
with materials used for dielectric or structural
Solid Electrical Insulating Materials
D 664 Test for Neutralization Number by
2
Potentiometric Titration
'This method is under the jurisdiction of ASTM Commit­
D 877 Test for Dielectric Breakdown Volt­
tee D-27 on Electrical Insulating Liquids and Gases.
Current edition approved July 25, 1975. Published
age of Insulating Liquid·s Using Disk
August 1975. Originally published as D 3255 - 73. Last
2
Electrodes
previous edition D 3255 - 73.
D 924 Test for Power Factor and Dirlectric
'Annual Book of ASTM Standards, Part40.
843

---------------------- Page: 1 ----------------------
D 3255
purposes is a complex phenomenon. This test
6.3.2 Karl Fisher-See Method D 1533.
provides information for selecting insulating
6.4 Physical Testing Apparatus:
and structural materials that will not adversely
6.4.1 Tensile Strength-Appropriate ASTM
affect the dielectric and chemical properties of
method for specific material being evaluated.
the askarel. The information generated from
6.4.2 Hardness-Appropriate ASTM
'method for specific material being evaluated.
the use of this test method should not be used to
6.4.3 Dimensional Change-Micrometer or
evaluate the effects of long-time service charac­
caliper.
teristics.
6.4.4 Weigh1 Change-Analytical balance.
4.2 Intensification of, or change in, color
6.4.5 Color-See Method D 2129.
indicates solubility of some component of the
solid in the askarel that may have an adverse
7. Procedure
effect on the fluid.
7.1 Refinement of the Askarel Fluid-Re­
4.3 The magnitude of change in the physical
fine the transformer askarel by adsorptive
properties of the solid specimens after exposure
treatment to the following specifications:
to askarel fluid may be used as a basis for
7.1.1 Color, Method D 2129, 100, max­
judging the short-term compatibility or these
imum.
insulating-structural materials in askarel.
7.1.2 Appearance, clear.
4.4 Conformance with the requirements of
7.1.3 Neutralization Number, Method
this method does not recommend a material for
application, unless all other required perform­ D 664, 0.014 mg KOH/g, maximum.
7.1.4 Moisture, Method D 1533, 30 ppm,
ance criteria are met.
maximum.
S. Interferences
7.1.5 Dielectric Breakdown Voltage,
Method D 877, 35 kV, minimum.
5.1 If the
...

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