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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Historical Version s – view previous versions of standard Translated Version s: Rinse all parts thoroughly with hot tap water, then with cold tap water, followed by several rinses with distilled water. 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.
If the difference in the measurements of the two test specimens is greater than 0.
No further reproductions authorized. In general, since the dissipation factor or power factor of insulating oils in good condition have decimal values below 0.
Remove the inner electrode and hold it suspended in air; then decant the rinsing liquid and immediately ll the cell from the c924 of the heated specimen. It is essential, therefore, that the procedures outlined below be closely followed.
Insulating oil dielectric loss tester unit tan delta test equipment. Consult d9924 procedures before samples are taken. Current edition approved Nov. Wooden Box with Foam Inside. Replace the inner electrode. In some research investigations, tests may be made at considerably higher temperatures while in asym cases, particularly for tests on cable oils in service, tests may be made over a range of temperatures.
If it is not feasible, the length of time the sample is exposed to atmospheric conditions must be kept to a minimum. Signicance and Use 4. 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.
Precision and Bias In general, the use of astn forced-draft air test chamber or automatic thermo-regulator cell is preferable.
ASTM D924 method Transformer Oil Dielectric Loss And Tan-delta Tester
Contact Now Customized Request. The reported value of D or PF may be expressed as a decimal value or as a percentage. A low dissipation factor or power factor indicates low ac dielectric losses.
Specific warnings are given in Once receive your question, the supplier will answer you as soon as possible.
Gold Member Since Mercury, or its vapor, may be hazardous to health and corrosive to materials. Use a shielded wire or coaxial cable for connecting the guard and measuring electrodes to the bridge. Not exactly what you want? 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. The volume of oil required when using this cell is mL.
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 a combination of both types. Huazheng Electric Manufacturing Baoding Co. Solvents mentioned in Can be delivered by air,ship and express. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Insulating oil dielectric loss and resistivity tester is used for asrm dielectric dissipation factor and DC resistivity of insulating oil and other insulating liquids. Historical Version s – view previous versions of standard.
On some instruments the cell must be in place before lling with specimen. Please see the below display and the operation details: Metals that have been found astmm from this standpoint are gold, nickel, Monel, platinum, and stainless steel. 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. qstm
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. D24, 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. No fumigation,not influence the delivery; 4.
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