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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Oil cup astk cleaned automatically and has electrode calibration function. The alignment of the electrodes shall not be inuenced by this temperature nor by the operation of lling the cell with the test liquid.

The manner in which dissipation factor varies with frequency is determined by the nature of the dielectric losses, that is, whether they atm predominantly polar or ionic, or are a combination of both types.

Mercury, or its vapor, may be hazardous to health and corrosive to materials. A low dissipation factor or power factor indicates low ac dielectric losses.

ASTM D液体绝缘材料介质损耗测试法_百度文库

A number in astj indicates the year of last reapproval. Provide a safety interlock on the door of the oven so that the electrical circuit supplying voltage to the test cell will be broken when the oven door is opened. HS code is ; 2. The reported value adtm D or PF may be expressed as a decimal value or as a percentage.

Record data as soon as the test temperature is reached.

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

Take care not to lay the electrodes on any surface. Enter between 20 to 4, characters.

Last previous edition approved in as D — China hair loss China weight loss equipment China vacuum fat loss machine. No minimum capacitance is therefore suggested. Wooden box with foam inside, 3. Welcom Your Visit to Our Factory!

Insulating materials of the molded mica-dust type, have been found to absorb solvents and therefore are not considered as satisfactory in the measurement of low loss liquids. If it is not feasible, the length of time the sample is exposed to atmospheric conditions must be kept to a minimum. Contact Supplier Start Order. Get Latest Price Min.

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Immediately return the lled cell to the test chamber adjusted to a temperature above the desired test temperature and make the necessary electrical connections to the cell. Can be delivered by air,ship and express. Replace the beaker with the remainder of the heated sample on the hot plate. NOTE 1—The dissipation factor of an electrical insulating liquid usually decreases with increasing frequency in the frequency range covered by This standard has been approved for use by agencies of the Department of Defense.

Not exactly what you want? 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. Huazheng Electric Manufacturing Baoding Co. If the difference in the measurements of the two test specimens is equal to or less than 0. Measurements are made at many different temperatures.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. A low dissipation factor or power factor indicates low ac dielectric losses. China inch loss machine China weight loss body cream China vacuum therapy weight loss. It is therefore desirable that the elapsed time necessary for the test specimen to attain temperature equilibrium with the test cell be held to a minimum. Accordingly, there is no simple conversion factor for deter- mining the dissipation factor at 60 Hz, for example, if the measurements are made at either a higher or lower frequency.

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. On some instruments the cell must be in place before lling with specimen.

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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. Number of Tests Samples to be subjected to this test should preferably be obtained through a closed system. If the difference in the measurements of the two test specimens is greater than 0. However, an intermediate value of relative permittivity may sometimes be advantageous in achieving a better voltage distribution of a-c electric elds between the liquid and solid insulating materials with which the liquid may be in series.

Large-screen LCD,backlight, display is clear. We have our own manufacturing factory,pls see the below certificate,we are the direct supplier. Decant the rinsing liquid and immediately ll the cell with a new aliquot of sample.

Use these measurements in calculating the relative permittivity from the following equation: Solvents mentioned in As a precaution against this eventuality, use a suitable stopper to plug this opening prior to starting the cleaning operation.

The operation display can be pulled out as the pictures show: However, an intermediate value of relative permittivity may sometimes be advantageous in achieving a better voltage distribution of ac electric fields between the liquid and solid insulating materials with which the liquid may be in series. Preparation of Specimen and Filling Test Cell It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.