ASTM D1169-02e1

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e1
Designation: D 1169 – 02
Standard Test Method for
Specific Resistance (Resistivity) of Electrical Insulating
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Liquids
This standard is issued under the fixed designation D 1169; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
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e NOTE—Adjunct references were corrected editorially in May 2006.
1. Scope cal Insulating Liquids
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2.2 ASTM Adjunct:
1.1 This test method covers the determination of specific
Test cells
resistance (resistivity) applied to new electrical insulating
liquids, as well as to liquids in service, or subsequent to
3. Terminology
service, in cables, transformers, circuit breakers, and other
3.1 Definitions of Terms Specific to This Standard:
electrical apparatus.
3.1.1 specific resistance (resistivity), n—the ratio of the dc
1.2 This test method covers a procedure for making referee
potentialgradientinvoltspercentimetreparallelingthecurrent
tests with dc potential.
flowwithinthespecimen,tothecurrentdensityinamperesper
1.3 When it is desired to make routine determinations
square centimetre at a given instant of time and under
requiring less accuracy, certain modifications to this test
prescribed conditions. This is numerically equal to the resis-
method are permitted as described in Sections 19-26.
tancebetweenoppositefacesofacentimetrecubeoftheliquid.
1.4 This standard does not purport to address all of the
The units are ohm-centimetres.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
4.1 The resistivity of a liquid is a measure of its electrical
bility of regulatory limitations prior to use. See 17.6 for a
insulating properties under conditions comparable to those of
specific warning statement.
the test. High resistivity reflects low content of free ions and
ion-forming particles, and normally indicates a low concentra-
2. Referenced Documents
2 tion of conductive contaminants.
2.1 ASTM Standards:
D150 Test Methods for AC Loss Characteristics and Per-
5. General Considerations
mittivity (Dielectric Constant) of Solid Electrical Insula-
5.1 Theory and measuring equipment pertaining to this
tion
method shall be in accordance with Test Methods D257.
D257 Test Methods for DC Resistance or Conductance of
5.2 Where both ac loss characteristic (dissipation factor or
Insulating Materials
power factor) and resistivity measurements are to be made
D923 Practices for Sampling Electrical Insulating Liquids
consecutivelyonthesamespecimen,maketheacmeasurement
D924 TestMethodforDissipationFactor(orPowerFactor)
before applying the dc potential to the specimen, and short
and Relative Permittivity (Dielectric Constant) of Electri-
circuit the cell electrodes for 1 min immediately prior to
making the resistivity measurements.
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This test method is under the jurisdiction of ASTM Committee D27 on
5.3 Make referee tests for resistivity in an atmosphere of
Electrical Insulating Liquids and Gases and is the direct responsibility of Subcom-
less than 50% relative humidity. For repeatable results make
mittee D27.05 on Electrical Tests.
these tests under carefully controlled atmospheric conditions.
Current edition approved Oct. 10, 2002. Published December 2002. Originally
published as D1169–51T. Last previous edition D1169–95.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Information as to where these cells can be purchased and working drawings of
Standards volume information, refer to the standard’s Document Summary page on them may be obtained from ASTM International Headquarters. Order Adjunct No.
the ASTM website. ADJD116901.
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D 1169–02
5.4 Aside from the adverse influence of contamination on deflection shall be not less than 20 divisions for the applicable
−9
results of the resistivity test, there are other factors that can Ayrton shunt ratio. For currents less than 10 Aan electronic
contribute to variations in the test results as follows: picoammeter has been found suitable. In using this instrument
5.4.1 Theuseofaninstrumentnothavinganadequaterange the multiplier selected shall be such as to give at least one-half
foraccuratelymeasuringthecurrentflowinginthecircuit.(See full-scale deflection on t
...