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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A superscript epsilon indicates an editorial change since the last revision or reapproval. Equipped with over-voltage, over-current and limit protections.

The alignment of the electrodes shall not be inuenced by this temperature nor by the operation of lling the cell with the test liquid. HS code is ; 2. Cleaning Test Cell Internal standard capacitor electrode type capacitor,with electrode spacing 2mm. Ashm comments are invited either for revision of this standard or f924 additional standards and should be addressed to ASTM International Headquarters.

Enter between 20 to 4, characters. If the difference in the measurements of the two test specimens is greater than 0.

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

Some liquids, such as oils of petroleum origin, undergo changes when exposed f924 sunlight. 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. No minimum capacitance is therefore suggested. 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.

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People who viewed this also viewed. For decimal values up to 0. Accordingly, there is no simple conversion factor for deter- mining the dissipation factor at 60 D24, for example, if the measurements are made at either a higher or lower frequency. Mercury, or its vapor, may be hazardous to health and corrosive to materials.

ASTM D液体绝缘材料介质损耗测试法_百度文库

Samples to be subjected to this test should preferably be obtained through a closed system. Huazheng Electric Manufacturing Baoding Co. Current edition approved Nov. Measured temperature and system clock. Originally approved in as D — 47 T. What is the warranty for the product? Find Similar Products By Category. However, the precaution on high electrical stresses awtm in Section 9 shall be observed. 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.

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.

Shipped in 15 days after payment. Send your message to this supplier. However, an intermediate value of relative permittivity asrm 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. 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 therefore desirable that the elapsed time necessary for the test specimen to attain temperature equilibrium with the test cell be held to a minimum.

Take care that the surfaces on which the component parts of the cell are placed in the oven are clean. Decant the rinsing liquid and immediately ll the cell with a new aliquot of sample.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. No further reproductions authorized.

We have our own manufacturing factory,pls see the below certificate,we are the direct supplier. 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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The manner in which dissipation factor varies with frequency e924 determined by the nature of the dielectric losses, that is, whether they are predominantly polar or ionic, or are a combination of both types.