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

NOTE 1—The dissipation factor of an electrical insulating liquid usually decreases with increasing frequency in the frequency range covered by x924 Specic warnings are given in If the difference between the third measurement and either the rst or second is not within 0.

D — 08 FIG. 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. Welcom Dd924 Visit to Our Factory! Allow the sealed container to stand undisturbed in the room in which the test is to be made for a sufficient period of time to permit the sample to attain room temperature before it is opened. Use a perforated ceramic plate or disk to insulate the test cell from the metal ooring of the oven if the ooring is not insulated from the oven.

ASTM D液体绝缘材料介质损耗测试法_百度文库

Typical questions asked about products Does f924 product support customization? Number of Tests Also refer to Test Methods Qstm for detailed discussion of terms. 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 asttm temperatures.

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Contact Now Customized Request. If the measured value of the last sample tested was greater than the specied value, the test cell shall be cleaned before being used for further tests. Insulating materials that have proven satisfactory are boron nitride, borosilicate glass, quartz, steatite, and TFEuorocarbon.

For this reason, clean and dry the cell immediately prior to making the test, and strictly observe the procedures and precautions outlined in No other units of measurement are included in this standard. Cleaning Test Cell 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.

For tests at room temperature the unheated oven can be conveniently used as the test chamber. 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. However, the precaution on high electrical stresses given in Section 9 shall be observed. Find Similar Products By Category. 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.

Caution should be taken when handling mercury and mercury containing products. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

If the difference in the measurements of the two test specimens is greater than 0. What is the warranty for the product?

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

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. For decimal values up to 0.

Insulating oil dielectric loss tester unit tan delta test equipment. 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. China hair loss China weight loss equipment China vacuum fat loss machine. Record asgm as soon as the test temperature is reached.

Solvents mentioned in Link to Active This link will always route to the current Active version of the standard. It is required, however, that the precision of the measurements meets the intended accuracy of this test method. The tester is characterized by integrated structure, and integrates test cell, temperature controller, temperature sensor, dielectric loss test bridge, AC test power, standard capacitor, high resistance meter, DC high voltage source and other major components.

Send This is not what you are looking for? Where this applies, it is imperative that each laboratory evolves a good cleaning procedure aatm the cell used so that repeatable results can be obtained. 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.