ASTM D Standard Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids. Find the most up-to-date version of ASTM D at Engineering We perform testing by ASTM D on electrical insulating liquids used in cables, transformers, oil circuit breakers, and other electrical apparatus.

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Wash the component parts with a mild abrasive soap or detergent. No other units of measurement are included in this standard. Transformer tester, High voltage generatorRelay test kitPower quality analyzerinsulating oil testerHigh voltage tester, Insulation tester, Earth resistance tester and so on. Rinse all parts thoroughly with hot tap water, then with c924 tap water, followed by several rinses with distilled water.

Take care that the surfaces on which the component parts of the cell are placed in the oven are clean. For optimum procedure do not exceed 20 min for this time. D — 08 FIG.

In general, plated surfaces have been found less satisfactory than solid metal electrodes when testing liquids having low loss.

Some liquids, such as oils of petroleum origin, undergo changes when exposed to sunlight.

ASTM D924 method Transformer Oil Dielectric Loss And Tan-delta Tester

For decimal values up to 0. In general, the use of a forced-draft air test chamber or automatic thermo-regulator cell is preferable. China hair loss China weight loss equipment China vacuum fat loss machine. Dissipation factor or power factor may be useful as a means of quality control, and as an indication of changes in quality resulting from contamination and deterioration in service or as a result of handling. Mercury, or its vapor, may be hazardous to health and corrosive to materials.


Plated surfaces that may be satisfactory for testing liquids having low acidity and for short periods of time are gold, platinum, nickel, chromium over nickel, or rhodium. Do not dry test cells made of Monel at this elevated temperature for more than 90 min as oxidation will take place causing erroneous results. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

For the first use, a low value of relative permittivity is often desirable in order to have the capacitance be as small as possible, consistent with acceptable chemical and heat transfer properties. Tests at higher stresses are desirable but shall not reach such values that electrical discharges across the cell insulating surfaces occur or that internal ionization of the specimen may be expected.

Wooden box with foam inside, 3. The concentric cylinders are of nickel-plated brass which are mounted on a TFE-uorocarbon base and contained in an mL borosilicate glass beaker. The reported value of D or PF may be expressed as a decimal value or as a percentage. Also refer to Test Methods D for detailed discussion of terms. NOTE 1—The dissipation factor of an electrical insulating liquid usually decreases with increasing frequency in the frequency range covered by Insulating oil dielectric loss tester unit tan delta test equipment.

Measured temperature and system clock. It is essential, therefore, that the procedures outlined below be closely followed. For the rst use, a low value of relative permittivity is often desirable in order to have the capacitance be as small as possible, consistent with acceptable chemical and heat transfer properties. It is required, however, that the precision of the measurements meets the intended accuracy of this test method.


If d94 difference in the measurements of the two asgm specimens is equal to or less than 0. For routine tests, however, the requirement for a guard electrode may be waived, provided that the two-electrode cell used is of r924 capacitance and with sufficient ratio of surface area to sample thickness, in order to provide proper operation of the measuring equipment.

Contact Now Customized Request. Consult such procedures before samples are taken. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Wooden Box with Foam Inside. Where this applies, it is imperative that each laboratory evolves a good cleaning procedure for the cell used so that repeatable results can be obtained.

Take extreme care during the washing and rinsing of some test cells to prevent any moisture from entering the thermometer well in the inner electrode. In general, since the dissipation factor or power factor of insulating oils in good condition have decimal values below 0.

What is the warranty for the product? HS code is ; 2. When used as the dielectric in a capacitor, it is desirable to have a higher value of relative permittivity so the physical size of the capacitor may be as small as possible.

ASTM D液体绝缘材料介质损耗测试法_百度文库

The volume of oil required when using this cell is mL. We have our own manufacturing factory,pls see the below certificate,we are the direct supplier.

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