ASTM D924 PDF


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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For decimal values up to 0. Take care that 9d24 surfaces on which the component parts of the cell are placed in the oven are clean. Not exactly what you want? Specific warnings are given in Historical Version s – view previous versions of standard.

The dissipation factor of these insulating materials must necessarily be low, particularly that between the guard and measuring electrodes; otherwise difficulty may be experienced in balancing the guard circuits at elevated temperatures. Historical Version s – view previous versions of standard Translated Version s: Take care not to lay the electrodes on any surface. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

In some research investigations, tests may be made at considerably higher temperatures while in other cases, particularly for tests on cable oils in service, tests may be made over a range of temperatures.

Send your message to this supplier. Caution should be taken when handling mercury and mercury containing products. 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. This standard has been approved for use by agencies of the Department of Defense.

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Enter between 20 to 4, characters. In general, since the dissipation factor or power factor of insulating oils in good condition have decimal values below 0. Last previous edition approved in as D — 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.

Consult such procedures before samples are taken. 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. Current edition approved Nov.

Replace the beaker with the remainder of the heated sample on the hot plate.

No other units of measurement are included in this r924. Transformer d9924, High voltage generatorRelay test kitPower quality analyzerinsulating oil testerHigh voltage tester, Insulation tester, Earth resistance tester and so on. Some liquids, such as oils of petroleum origin, undergo changes when exposed to sunlight. NOTE 1—The dissipation factor of an electrical insulating liquid usually decreases with increasing frequency in the frequency range covered by Also refer to Test Methods D for detailed discussion of terms.

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HS code is ; 2. Samples to be subjected to this test should preferably be obtained through a closed system. Wash the component parts with a mild abrasive soap or detergent.

Due regard should be given to the precautions outlined in Section Both measurements should be made at the same temperature. If the difference between the third measurement and either the rst or second is not within 0. Accordingly, there is no simple conversion factor for deter- mining the dissipation factor at 60 Hz, for example, if the measurements are made astk either a higher or lower frequency.

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Remove the inner electrode and hold it suspended in air; then decant the rinsing liquid and immediately ll the cell from the remainder of the heated specimen. Link to Active This link will always route to the current Active version of the standard. D — 08 Standard Test Method for Dissipation Factor d94 Power Factor and Relative Permittivity Dielectric Constant of Electrical Insulating Liquids1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

Rinse all parts thoroughly with hot tap water, then with cold tap water, followed by several rinses asm distilled water. Mercury, or its vapor, may be hazardous to health and corrosive to materials.

If it is not feasible, the length of time the sample is exposed to atmospheric conditions must be kept to a minimum.

ASTM D924 Large-Screen Auto Washing Insulating Oil Dielectric Loss Tester

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. However, an intermediate value of relative permittivity may sometimes be advantageous in achieving a better voltage distribution of ac electric fields between d294 liquid and solid insulating materials with which the liquid may be in series.

Solvents mentioned in