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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Internal standard capacitor electrode type capacitor,with electrode spacing 2mm. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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. Wooden Box with Foam Inside. 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.

The operation display can be pulled out as the pictures show: If the difference in the measurements of the two test specimens is equal to or less than 0. Current edition approved Nov.

Wash the component parts with a mild abrasive soap or detergent. For this reason, clean and dry the cell immediately prior to making the test, and strictly observe the procedures and precautions outlined in Send This is not what you are looking for?

Zstm a precaution against this eventuality, use a suitable stopper to plug this opening prior to starting the cleaning operation.

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ASTM D液体绝缘材料介质损耗测试法_百度文库

Caution should be taken when handling mercury and mercury containing products. 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. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Shipped in 15 days after payment.

For optimum procedure do not exceed 20 min for this time. A superscript epsilon indicates an editorial change since the last revision or reapproval. Can be delivered by air,ship and express. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Equipped with over-voltage, over-current and limit protections. Send your message to this supplier.

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

Leakage across these paths has been found to produce an unsteady bridge balance on some bridges. In general, plated surfaces have been found less satisfactory than solid metal electrodes when testing liquids having low loss.

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. Find Similar Products By Category. Record data as soon as the test temperature is reached.

China hair loss China weight loss equipment China vacuum fat loss machine. This standard has been approved for use by agencies of the Department of Defense. Not exactly what you want? The concentric cylinders are of nickel-plated brass which are mounted on a TFE-uorocarbon base and contained in an mL borosilicate glass beaker.

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It is essential, therefore, that the procedures outlined below be closely followed. Huazheng Electric Manufacturing Baoding Co. Replace the inner electrode. Decant the rinsing liquid and immediately ll the cell with a new aliquot of sample. Gold Member Since A less satisfactory method is use of a hot plate, but variations in temperature throughout the cell may lead to questionable results.

NOTE 1—The dissipation factor of an electrical insulating liquid usually decreases with increasing frequency in axtm frequency range covered by 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 zstm small as possible. No further reproductions authorized. Use these measurements in calculating the relative permittivity from the following equation: Get Latest Price Min.

Immediately return the lled cell to the test chamber adjusted to a temperature above the desired test temperature and make the necessary electrical connections d9924 the cell.

For routine tests, however, the requirement for a guard electrode may be waived, provided that the two-electrode cell used is of adequate capacitance and with sufficient ratio of surface area to sample thickness, in order to provide proper operation of the measuring equipment.