ASTM D1169-19

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D1169 −19
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 U.S. Department of Defense.
1. Scope tivity (Dielectric Constant) of Solid Electrical Insulation
D257Test Methods for DC Resistance or Conductance of
1.1 This test method covers the determination of specific
Insulating Materials
resistance (resistivity) applied to new electrical insulating
D923Practices for Sampling Electrical Insulating Liquids
liquids, as well as to liquids in service, or subsequent to
D924Test Method for Dissipation Factor (or Power Factor)
service, in cables, transformers, circuit breakers, and other
and Relative Permittivity (Dielectric Constant) of Electri-
electrical apparatus.
cal Insulating Liquids
1.2 This test method covers a procedure for making referee
D2864Terminology Relating to Electrical Insulating Liq-
tests with dc potential.
uids and Gases
1.3 When it is desired to make routine determinations
requiring less accuracy, certain modifications to this test 3. Terminology
method are permitted as described in Sections19–26.
3.1 Definitions – Definitions of terms used in this test
1.4 The values stated in SI units are to be regarded as
method are given in Terminology D2864.
standard. No other units of measurement are included in this
standard.
4. Significance and Use
1.5 This standard does not purport to address all of the
4.1 The resistivity of a liquid is a measure of its electrical
safety concerns, if any, associated with its use. It is the
insulating properties under conditions comparable to those of
responsibility of the user of this standard to establish appro-
the test. High resistivity reflects low content of free ions and
priate safety, health, and environmental practices and deter-
ion-forming particles, and normally indicates a low concentra-
mine the applicability of regulatory limitations prior to use.
tion of conductive contaminants.
See 17.4.3 for a specific warning statement.
1.6 This international standard was developed in accor-
5. General Considerations
dance with internationally recognized principles on standard-
5.1 Theory and measuring equipment pertaining to this
ization established in the Decision on Principles for the
method shall be in accordance with Test Methods D257.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5.2 Where both ac loss characteristic (dissipation factor or
Barriers to Trade (TBT) Committee.
power factor) and resistivity measurements are to be made
consecutivelyonthesamespecimen,maketheacmeasurement
2. Referenced Documents
before applying the dc potential to the specimen, and short
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circuit the cell electrodes for 1 min immediately prior to
2.1 ASTM Standards:
making the resistivity measurements.
D150Test Methods forAC Loss Characteristics and Permit-
5.3 Make referee tests for resistivity in an atmosphere of
less than 50% relative humidity. For repeatable results make
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This test method is under the jurisdiction of ASTM Committee D27 on
these tests under carefully controlled atmospheric conditions.
Electrical Insulating Liquids and Gases and is the direct responsibility of Subcom-
mittee D27.05 on Electrical Test.
5.4 Aside from the adverse influence of contamination on
Current edition approved April 1, 2019. Published May 2019. Originally
results of the resistivity test, there are other factors that can
approved in 1951 as D1169–51T. Last previous edition approved in 2011 as
D1169–11. DOI: 10.1520/D1169-19.
contribute to variations in the test results as follows:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.4.1 Theuseofaninstrumentnothavinganadequaterange
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
foraccuratelymeasuringthecurrentflowinginthecircuit.(See
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Section 6 for two types of recommended instruments.)
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D1169−19
5.4.2 When the time of electrification is not exactly the 6.1.3 Time-MeasuringDevice,accurateto0.5s,formeasur-
same for every test. Upon the application of voltage, the ing the time of electrification.
current flow through the specimen decreases asympto
...