ASTM D6180-98(2004)
(Test Method)Standard Test Method for Stability of Insulating Oils of Petroleum Origin Under Electrical Discharge
Standard Test Method for Stability of Insulating Oils of Petroleum Origin Under Electrical Discharge
SCOPE
1.1 This test method covers a laboratory technique that measures the stability of new, used, or reclaimed insulating oils, similar to those described in Specification D 3487 in the presence of a controlled electric discharge. When subjected to this type of discharge, insulating oils absorb energy and produce gases as well as ionized molecules (charge carriers). The quantity of these decay products can be measured and can provide an indication of the stability of oils under the conditions of this test.
1.2 The gases are retained in the discharge cell and their pressure measured. The charge carriers remain in the test specimen. The change in the dissipation factor before and after the discharge is determined.
1.3 The values stated in SI units are to be regarded as the standard. The values stated in parentheses are 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 determine the applicability of regulatory limitations prior to use. Specific cautionary statements are given in and .
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Designation:D6180–98 (Reapproved2004)
Standard Test Method for
Stability of Insulating Oils of Petroleum Origin Under
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Electrical Discharge
This standard is issued under the fixed designation D 6180; 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 2.2 IEEE Standard:
4–1995 IEEE Standard Techniques for High-Voltage Test-
1.1 This test method covers a laboratory technique that
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ing
measures the stability of new, used, or reclaimed insulating
oils, similar to those described in Specification D 3487 in the
3. Summary of Test Method
presence of a controlled electric discharge. When subjected to
3.1 A test specimen is introduced into a discharge cell and
this type of discharge, insulating oils absorb energy and
degassed under vacuum at room temperature. An ac potential
produce gases as well as ionized molecules (charge carriers).
of 10 kV is applied between a high voltage electrode and a
The quantity of these decay products can be measured and can
grounded salt water electrode for 300 min. The gradual rise of
provide an indication of the stability of oils under the condi-
the pressure inside the discharge cell is measured on an
tions of this test.
electronic vacuum meter as a function of time. The dissipation
1.2 The gases are retained in the discharge cell and their
factor of the oil at 100°C is determined before and after the
pressure measured. The charge carriers remain in the test
stability test.
specimen.The change in the dissipation factor before and after
the discharge is determined.
4. Significance and Use
1.3 The values stated in SI units are to be regarded as the
4.1 During this test, insulating oil in an evacuated cell is
standard. The values stated in parentheses are for information
subjected to a high voltage discharge between two electrodes.
only.
The discharge generates free electrons. These electrons collide
1.4 This standard does not purport to address all of the
with the oil molecules causing many of them to become
safety concerns, if any, associated with its use. It is the
electronically excited. Some of these molecules lose this
responsibility of the user of this standard to establish appro-
energyasaquantaoflightemittingfluorescentradiation.Some
priate safety and health practices and determine the applica-
of the other excited molecules decompose into gases, ionized
bility of regulatory limitations prior to use. Specific cautionary
molecules and free radicals. These changes can provide an
statements are given in 5.3 and 7.1.
indication of the stability of oils under the conditions of this
test method. The measures of these changes are the increase of
2. Referenced Documents
2 the pressure in the test cell and the increase in the dissipation
2.1 ASTM Standards:
factor of the test specimen.
D 923 Practice for Sampling Electrical Insulating Liquids
4.2 During the test, the gas content increases in the cell and
D 924 TestMethodforDissipationFactor(orPowerFactor)
the concentration of charge carriers increases in the oil.
and Relative Permittivity (Dielectric Constant) of Electri-
cal Insulating Liquids
5. Apparatus
D 3487 Specification for Mineral Insulating Oil Used in
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5.1 Discharge Cell, shown in Fig. 1, includes an electronic
Electrical Apparatus
vacuummeter.Thecellmustbemadeofquartz,beofspherical
shape, and have a 500 mL capacity. The electrode is sealed in
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This test method is under the jurisdiction of ASTM Committee D27 on
Electrical Insulating Liquids and Gases and is the direct responsibility of Subcom-
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mittee D27.05 on Electrical Test. Available from the Institute of Electrical and Electronic Engineers, Inc., P.O.
Current edition approved Oct. 1, 2004. Published November 2004. Originally Box 1331, Piscataway, NJ 08855.
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approved in 1997. Last previous edition approved in 1998 as D 6180-98. The sole source of supply of the discharge cell known to the committee at this
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or time is Insoil Canada Ltd., 231 Hampshire Place, N.W., Calgary, AB Canada T3A
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 4Y7. If you are aware of alternative suppliers, please provide this information to
Standards volume information, refer to the standard’s Document Summary page on ASTM International Headquarters. Your comments will receive careful consider-
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the ASTM website. ation at a meeting of the responsible technical committee , which you may attend.
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