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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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. Insulating materials that have proven satisfactory are boron nitride, borosilicate glass, quartz, steatite, and TFEuorocarbon.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. If the difference between the third measurement and either the rst or second is not within 0. Caution should be taken when handling mercury and mercury containing products.
What is the warranty for the product? On some instruments the cell must be in place before lling with specimen. It is essential, therefore, that the procedures outlined below be closely followed. You Might Also Like. 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.
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. In some research investigations, tests may aetm made at considerably higher temperatures while in other cases, particularly for tests on cable oils in service, tests may be made over a range ast temperatures. Gold Member Since Huazheng Electric Manufacturing Baoding Co.
Find Similar Products By Category. D — 08 Standard Ashm Method for Dissipation Factor or 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.
A low dissipation factor or power factor indicates low ac dielectric losses.
ASTM D924 method Transformer Oil Dielectric Loss And Tan-delta Tester
China inch loss machine China weight loss body cream China vacuum therapy weight loss. The manner in which dissipation factor varies with frequency is determined by the nature of the dielectric losses, that is, whether they are predominantly polar or ionic, or are d9224 combination of both types.
It is required, however, that the precision of the measurements meets the intended accuracy of this test method. Also refer to Test Methods D for detailed discussion of terms. Due regard should be given to sstm precautions outlined in Section Accordingly, there is no simple r924 factor for deter- mining the dissipation factor at 60 Hz, for example, if the measurements are made at either a higher or lower frequency. Enter between 20 to 4, characters.
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ASTM D924 Large-Screen Auto Washing Insulating Oil Dielectric Loss Tester
A number in parentheses indicates the year of last reapproval. No other units of measurement are included in this standard. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Metals that have been found satisfactory from this standpoint are gold, nickel, Monel, platinum, and stainless steel. Take care that the surfaces on which the component parts of the cell are placed in the oven are clean.
Replace the beaker with the remainder of the heated sample on the hot plate. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
The operation display can be pulled out as the pictures show: Samples to be subjected to this test should preferably be obtained through a closed system. We have our own manufacturing factory,pls see the below certificate,we are the direct supplier. In general, plated surfaces have been found less satisfactory than solid d9244 electrodes when testing liquids having low loss.
The alignment d9244 the electrodes shall not be inuenced by this temperature nor by the operation of lling the cell with the test liquid. For the rst use, a low value atsm relative permittivity is often desirable in order to have the capacitance be as small as possible, consistent with acceptable chemical and heat transfer properties.
Specific astj are given in 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. Typical questions asked about products Does this product support customization?