ASTM D1169-09

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Designation: D1169 – 09
Standard Test Method for
Specific Resistance (Resistivity) of Electrical Insulating
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Liquids
This standard is issued under the fixed designation D1169; 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 (´) 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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1. Scope 2.2 ASTM Adjunct:
Test cells
1.1 This test method covers the determination of specific
resistance (resistivity) applied to new electrical insulating
3. Terminology
liquids, as well as to liquids in service, or subsequent to
3.1 Definitions of Terms Specific to This Standard:
service, in cables, transformers, circuit breakers, and other
3.1.1 specific resistance (resistivity), n—the ratio of the dc
electrical apparatus.
potentialgradientinvoltspercentimetreparallelingthecurrent
1.2 This test method covers a procedure for making referee
flowwithinthespecimen,tothecurrentdensityinamperesper
tests with dc potential.
square centimetre at a given instant of time and under
1.3 When it is desired to make routine determinations
prescribed conditions. This is numerically equal to the resis-
requiring less accuracy, certain modifications to this test
tancebetweenoppositefacesofacentimetrecubeoftheliquid.
method are permitted as described in Sections 19-26.
The units are ohm-centimetres.
1.4 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Significance and Use
standard.
4.1 The resistivity of a liquid is a measure of its electrical
1.5 This standard does not purport to address all of the
insulating properties under conditions comparable to those of
safety concerns, if any, associated with its use. It is the
the test. High resistivity reflects low content of free ions and
responsibility of the user of this standard to establish appro-
ion-forming particles, and normally indicates a low concentra-
priate safety and health practices and determine the applica-
tion of conductive contaminants.
bility of regulatory limitations prior to use. See 17.6 for a
specific warning statement.
5. General Considerations
5.1 Theory and measuring equipment pertaining to this
2. Referenced Documents
2 method shall be in accordance with Test Methods D257.
2.1 ASTM Standards:
5.2 Where both ac loss characteristic (dissipation factor or
D150 Test Methods for AC Loss Characteristics and Per-
power factor) and resistivity measurements are to be made
mittivity (Dielectric Constant) of Solid Electrical Insula-
consecutivelyonthesamespecimen,maketheacmeasurement
tion
before applying the dc potential to the specimen, and short
D257 Test Methods for DC Resistance or Conductance of
circuit the cell electrodes for 1 min immediately prior to
Insulating Materials
making the resistivity measurements.
D923 Practices for Sampling Electrical Insulating Liquids
5.3 Make referee tests for resistivity in an atmosphere of
D924 Test Method for Dissipation Factor (or Power Factor)
less than 50% relative humidity. For repeatable results make
and Relative Permittivity (Dielectric Constant) of Electri-
these tests under carefully controlled atmospheric conditions.
cal Insulating Liquids
5.4 Aside from the adverse influence of contamination on
results of the resistivity test, there are other factors that can
contribute to variations in the test results as follows:
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This test method is under the jurisdiction of ASTM Committee D27 on
5.4.1 Theuseofaninstrumentnothavinganadequaterange
Electrical Insulating Liquids and Gases and is the direct responsibility of Subcom-
mittee D27.05 on Electrical Test.
foraccuratelymeasuringthecurrentflowinginthecircuit.(See
Current edition approved May 1, 2009. Published June 2009. Originally
Section 6 for two types of recommended instruments.)
approved in 1951 as as D1169–51T. Last previous edition approved in 2002 as
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D1169–02 . DOI: 10.1520/D1169-09.
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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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D1169 – 09
5.4.2 When the time of electrification is not exactly the 6.1.4 Batteries or other stable direct-voltage supplies are
same
...