D1807

D1807-00
Standard Test Methods for Refractive Index and Specific Optical Dispersion of Electrical Insulating Liquids

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 D-1218. Specific optical dispersion is calculated by dividing the refractive dispersion value determined in Test Method D-1218 by the relative density (specific gravity) (see Test Method D-1298) of the liquid under test.

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