ASTM D1807-00(2005)e1
(Test Method)Standard Test Methods for Refractive Index and Specific Optical Dispersion of Electrical Insulating Liquids (Withdrawn 2014)
Standard Test Methods for Refractive Index and Specific Optical Dispersion of Electrical Insulating Liquids (Withdrawn 2014)
SIGNIFICANCE AND USE
Refractive Index—The refractive index of an insulating liquid varies with its composition and with the nature and amount of contaminants held in solution. Changes of refractive index with time and service may form a basis for estimating any change in composition or the degree of contaminant acquired in service. For electrical insulating mineral oils, the wavelength of 5893 ˚A for the spectral line of sodium is commonly used. The test temperature is 25°C.
Specific Optical Dispersion—Specific optical dispersion serves as a quick index to the amount of unsaturated compounds present in an oil. Dispersion values for paraffinic and naphthenic compounds are nearly the same and are essentially independent of molecular weight and structural differences. Values above 97 bear a direct relationship to the amount of aromatic compounds present in insulating oil. For convenience, the specific dispersion value is multiplied by 10 4. For electrical insulating mineral oils, the wavelengths of 6563 and 4861 ˚A corresponding to the spectral lines of hydrogen are commonly used. Alternatively, the wavelengths of 6678 and 5016 ˚A corresponding to the spectral lines of helium may be used.
SCOPE
1.1 These test methods cover the determination of the refractive index and the specific optical dispersion of electrical insulating liquids such as are used in capacitors, transformers, circuit breakers, and oil-filled cables.
1.2 Two test methods are described, a routine method and a more precise referee method. Both methods are applicable to transparent, light-colored, insulating liquids.
1.2.1 The routine method is used to determine refractive index and specific optical dispersion as described in these test methods.
1.2.2 The referee method is used when a test of high accuracy is desired. These methods are described in Test Method D1218. Specific optical dispersion is calculated by dividing the refractive dispersion value determined in Test Method D1218 by the relative density (specific gravity) (see Test Method D1298) of the liquid under test.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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.
WITHDRAWN RATIONALE
These test methods cover the determination of the refractive index and the specific optical dispersion of electrical insulating liquids such as are used in capacitors, transformers, circuit breakers, and oil-filled cables.
Formerly under the jurisdiction of Committee D27 on Electronic Insulating Liquids and Gases, these test methods were withdrawn in January 2014 in accordance with section 10.6.3 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.
General Information
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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
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Designation:D1807 −00(Reapproved 2005)
Standard Test Methods for
Refractive Index and Specific Optical Dispersion of
Electrical Insulating Liquids
This standard is issued under the fixed designation D1807; 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 (´) indicates an editorial change since the last revision or reapproval.
´ NOTE—The word “containment” was corrected to “contaminant” in the second sentence of 4.1 editorially in December
2009.
1. Scope Dispersion of Hydrocarbon Liquids
D1298 Test Method for Density, Relative Density (Specific
1.1 These test methods cover the determination of the
Gravity), or API Gravity of Crude Petroleum and Liquid
refractive index and the specific optical dispersion of electrical
Petroleum Products by Hydrometer Method
insulating liquids such as are used in capacitors, transformers,
circuit breakers, and oil-filled cables.
3. Terminology
1.2 Two test methods are described, a routine method and a
3.1 Definitions:
more precise referee method. Both methods are applicable to
3.1.1 refractive index, n—the ratio of the velocity of light in
transparent, light-colored, insulating liquids.
air to its velocity in the substance under test.
1.2.1 The routine method is used to determine refractive
3.1.2 relative density (specific gravity), n—the ratio of the
index and specific optical dispersion as described in these test
mass of a given volume of liquid at 15°C (60°F) to mass of an
methods.
equal volume of pure water at the same temperature.
1.2.2 The referee method is used when a test of high
3.1.3 specific optical dispersion, n—the difference between
accuracy is desired. These methods are described in Test
the refractive indexes of light of two different wavelengths,
Method D1218. Specific optical dispersion is calculated by
bothindexesmeasuredatthesametemperature,anddividedby
dividing the refractive dispersion value determined in Test
the relative density (specific gravity), also measured at the test
Method D1218 by the relative density (specific gravity) (see
temperature.
Test Method D1298) of the liquid under test.
4. Significance and Use
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4.1 Refractive Index—The refractive index of an insulating
standard.
liquid varies with its composition and with the nature and
amount of contaminants held in solution. Changes of refractive
1.4 This standard does not purport to address all of the
index with time and service may form a basis for estimating
safety concerns, if any, associated with its use. It is the
any change in composition or the degree of contaminant
responsibility of the user of this standard to establish appro-
acquired in service. For electrical insulating mineral oils, the
priate safety and health practices and determine the applica-
wavelength of 5893 ˚A for the spectral line of sodium is
bility of regulatory limitations prior to use.
commonly used. The test temperature is 25°C.
2. Referenced Documents
4.2 Specific Optical Dispersion —Specific optical disper-
sion serves as a quick index to the amount of unsaturated
2.1 ASTM Standards:
compounds present in an oil. Dispersion values for paraffinic
D1218 Test Method for Refractive Index and Refractive
and naphthenic compounds are nearly the same and are
essentially independent of molecular weight and structural
These test methods are under the jurisdiction of ASTM Committee D27 on
differences. Values above 97 bear a direct relationship to the
Electrical Insulating Liquids and Gasesand are the direct responsibility of Subcom-
amount of aromatic compounds present in insulating oil. For
mittee D27.07 on Physical Test.
convenience, the specific dispersion value is multiplied by
Current edition approved Oct. 1, 2005. Published November 2005. Originally
10 . For electrical insulating mineral oils, the wavelengths of
approved in 1960. Last previous edition approved in 2000 as D1807 – 00. DOI:
10.1520/D1807-00R05E01.
6563 and 4861 ˚A corresponding to the spectral lines of
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
hydrogen are commonly used. Alternatively, the wavelengths
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
of 6678 and 5016 ˚A corresponding to the spectral lines of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. helium may be used.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D1807−00 (2005)
5. Apparatus provided with the instrument. Divide the dispersion value by
the relative density (specific gravity) of the oil corrected to the
5.1 Refractometer—The refractometer to be used in the
temperature at which the dispersion readings were made.
routine method shall have an index range of approximately
Determine the relative density (specific gravity) in accordance
1.33 to 1.5 and be readable to 60.0002 units. The refractome-
with
...
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