ASTM D1807-00(2005)

Standard Test Methods for Refractive Index and Specific Optical Dispersion of Electrical Insulating Liquids

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 the 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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2005
• ICS: 29.040.10 - Insulating oils
• Technical Committee: D27 - Electrical Insulating Liquids and Gases
• Drafting Committee: D27.07 - Physical Test

Relations

• Replaces: ASTM D1807-00 - Standard Test Methods for Refractive Index and Specific Optical Dispersion of Electrical Insulating Liquids
• Effective Date: 01-Oct-2005
• Replaced By: ASTM D1807-00(2005)e1 - Standard Test Methods for Refractive Index and Specific Optical Dispersion of Electrical Insulating Liquids (Withdrawn 2014)
• Effective Date: 01-Oct-2005
• Referred By: ASTM D4652-20 - Standard Specification for Silicone Liquid Used for Electrical Insulation
• Effective Date: 01-Oct-2005
• Referred By: ASTM D2225-20 - Standard Test Methods for Silicone Liquids Used for Electrical Insulation
• Effective Date: 01-Oct-2005

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
Designation: D1807 – 00 (Reapproved 2005)
Standard Test Methods for
Refractive Index and Specific Optical Dispersion of
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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.
1. Scope D1218 Test Method for Refractive Index and Refractive
Dispersion of Hydrocarbon Liquids
1.1 These test methods cover the determination of the
D1298 Test Method for Density, Relative Density (Specific
refractive index and the specific optical dispersion of electrical
Gravity), or API Gravity of Crude Petroleum and Liquid
insulating liquids such as are used in capacitors, transformers,
Petroleum Products by Hydrometer Method
circuit breakers, and oil-filled cables.
1.2 Two test methods are described, a routine method and a
3. Terminology
more precise referee method. Both methods are applicable to
3.1 Definitions:
transparent, light-colored, insulating liquids.
3.1.1 refractive index, n—the ratio of the velocity of light in
1.2.1 The routine method is used to determine refractive
air to its velocity in the substance under test.
index and specific optical dispersion as described in these test
3.1.2 relative density (specific gravity), n—the ratio of the
methods.
mass of a given volume of liquid at 15°C (60°F) to mass of an
1.2.2 The referee method is used when a test of high
equal volume of pure water at the same temperature.
accuracy is desired. These methods are described in Test
3.1.3 specific optical dispersion, n—the difference between
Method D1218. Specific optical dispersion is calculated by
the refractive indexes of light of two different wavelengths,
dividing the refractive dispersion value determined in Test
bothindexesmeasuredatthesametemperature,anddividedby
Method D1218 by the relative density (specific gravity) (see
the relative density (specific gravity), also measured at the test
Test Method D1298) of the liquid under test.
temperature.
1.3 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 Refractive Index—The refractive index of an insulating
1.4 This standard does not purport to address all of the
liquid varies with its composition and with the nature and
safety concerns, if any, associated with its use. It is the
amount of contaminants held in solution. Changes of refractive
responsibility of the user of this standard to establish appro-
index with time and service may form a basis for estimating
priate safety and health practices and determine the applica-
any change in composition or the degree of containment
bility of regulatory limitations prior to use.
acquired in service. For electrical insulating mineral oils, the
˚
wavelength of 5893 A for the spectral line of sodium is
2. Referenced Documents
2 commonly used. The test temperature is 25°C.
2.1 ASTM Standards:
4.2 Specific Optical Dispersion—Specific optical dispersion
serves as a quick index to the amount of unsaturated com-
1
These test methods are under the jurisdiction of ASTM Committee D27 on
pounds present in an oil. Dispersion values for paraffinic and
Electrical Insulating Liquids and Gases and are the direct responsibility of
naphthenic compounds are nearly the same and are essentially
Subcommittee D27.07 on Physical Tests.
independent of molecular weight and structural differences.
Current edition approved Oct. 1, 2005. Published November 2005. Originally
approved in 1960. Last previous edition approved in 2000 as D1807 – 00. DOI:
Values above 97 bear a direct relationship to the amount of
10.1520/D1807-00R05.
aromaticcompoundspresentininsulatingoil.Forconvenience,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4
the specific dispersion value is multiplied by 10 . For electri-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
cal insulating mineral oils, the wavelengths of 6563 and 4861
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D1807 – 00 (2005)
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A corresponding to the spectral lines of hydrogen are com- provided with the instrument. Divide the dispersion value by
monly used. Alternatively, the wavelengths of 6678 and 5016 the relative density (specific gravity) of the oil corrected to the
˚
A corresponding to the spectral lines of helium may be used. temperature at which the dispersion rea
...