ASTM D3455-95

Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin

SCOPE
1.1 These test methods cover screening for the compatibility of materials of construction with electrical insulating oil for use in electrical equipment.  
1.2 This standard does not purport to address all of the safety problems, 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.

General Information

• Status: Historical
• Publication Date: 31-Dec-1994
• ICS: 29.040.10 - Insulating oils
• Technical Committee: D27 - Electrical Insulating Liquids and Gases
• Drafting Committee: D27.06 - Chemical Test

Relations

• Replaced By: ASTM D3455-02 - Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin (Withdrawn 2011)
• Effective Date: 10-Oct-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: D 3455 – 95
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Methods for
Compatibility of Construction Material with Electrical
1
Insulating Oil of Petroleum Origin
This standard is issued under the fixed designation D 3455; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.4 A material meeting the criteria recommended does not
necessarily indicate suitability for use in electrical equipment.
1.1 These test methods cover screening for the compatibility
Other properties must also be considered. Additionally, certain
of materials of construction with electrical insulating oil for use
materials containing additives may meet the requirements of
in electrical equipment.
these test methods, yet be unsatisfactory when subjected to
1.2 This standard does not purport to address all of the
longer term evaluations.
safety problems, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Apparatus
priate safety and health practices and determine the applica-
4.1 Sample-Handling Apparatus:
bility of regulatory limitations prior to use.
4.1.1 Oven, forced-draft, adjustable to 100 6 1°C, and a
drying oven, adjustable to 105 6 5°C.
2. Referenced Documents
4.1.2 Glass Containers, 1-L, fitted with glass or aluminum
2.1 ASTM Standards:
foil covers.
D 877 Test Method for Dielectric Breakdown Voltage of
2
Insulating Liquids Using Disk Electrodes
NOTE 1—Other materials have been found to be suitable as covers.
D 924 Test Method for Dissipation Factor (or Power Factor)
4.2 Sample-Testing Apparatus:
and Relative Permittivity (Dielectric Constant) of Electri-
4.2.1 Tensile Strength—As specified in appropriate test
2
cal Insulating Liquids
method.
D 971 Test Method for Interfacial Tension of Oil Against
4.2.2 Hardness—As specified in appropriate test method.
2
Water by the Ring Method
4.2.3 Dimensional Change—Micrometer and caliper.
D 974 Test Method for Acid and Base Number by Color-
4.2.4 Weight Change—Analytical balance.
3
Indicator Titration
D 1500 Test Method for ASTM Color of Petroleum Prod-
5. Preparation of Test Specimen
3
ucts (ASTM Color Scale)
5.1 Test specimen size shall be such that the ratio of surface
D 3487 Specification for Mineral Insulating Oil Used in
area to oil volume is four times as large as the ratio encoun-
2
Electrical Apparatus
tered in normal use in electrical equipment unless there is some
special reason for using a different ratio (Note 2). Some
3. Significance and Use
suggested ratios are as follows:
3.1 The magnitude of the changes in the electrical properties
5.1.1 If the test specimen can be measured, no less than 52
of the insulating oil are of importance in determining the 2
cm are used with each 800 mL of oil.
contamination of the oil by the test specimen.
5.1.2 If the test specimen is insoluble in oil and the surface
3.2 Physical and chemical changes in the oil such as color,
area cannot be measured, the test specimen shall be used in the
interfacial tension and acidity, also indicate solubility or other
amount of 1 % by the weight of the oil.
adverse effects of the test specimen on the oil.
5.1.3 If the material is soluble in the oil, the test specimen
3.3 Physical changes of the test specimen such as hardness,
shall be used in the amount of 0.5 % by the weight of the oil.
swelling, and discoloration show the effect of the oil on the test
5.1.4 Varnishes and materials used as dip coatings shall be
specimen and are used to determine the suitability of the
cured on aluminum foil or paper known to be compatible with
material for use in insulating oil.
insulating oil. They should be tested at a ratio of 14 g or
2
approximately 1300 cm of surface area per 800 mL of oil.
1 5.1.5 Core steel and core-steel coatings shall be tested at a
These test methods are under the jurisdiction of ASTM Committee D-27 on
2
ratio of 3100 cm for each 400 mL of oil, for transformer
Electrical Insulating Liquids and Gasesand are the direct responsibility of Subcom-
mittee D27.06on Chemical Tests.
applications. A realistic core steel ratio for regulators is 5000
Current edition approved June 15, 1995. Published August 1995. Originally 2
cm of surface area per each 400 mL of oil.
published as D 3455 – 75. Last previous edition D 3455 – 89.
2
2
5.1.6 Gasket materials shall be tested at a ratio of 65 cm
Annual Book of ASTM Standards, Vol 10.03.
3
Annual Book of ASTM Standards, Vol 05.01. surface area per 800 mL of oil.
1

...