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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This standard has been approved for use by agencies of the Department of Defense.

Oil cup is cleaned automatically and has electrode calibration function. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

For decimal values up aztm 0. Link to Active This link will always route to the current Active version of the standard. Large-screen LCD,backlight, display is clear. 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.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Some liquids, such as oils of petroleum origin, undergo changes when exposed to sunlight. Measured temperature and system clock.

ASTM D液体绝缘材料介质损耗测试法_百度文库

D — 08 Standard Test 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.

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A low dissipation factor or power factor indicates low 9d24 dielectric losses. 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. The operation display can be pulled out as the pictures show: Precision and Bias No fumigation,not influence the delivery; 4. Plated surfaces that may d9924 satisfactory for testing liquids having low acidity and for short periods of time d9924 gold, platinum, nickel, chromium over nickel, or rhodium.

A less satisfactory method is use of a hot plate, but variations in temperature throughout the cell may lead to questionable results. Once receive your question, the supplier will answer you as soon as possible. Where this applies, it is imperative that each laboratory evolves a d9924 cleaning procedure for the cell used so that repeatable results can be obtained.

It is essential, therefore, that the procedures outlined below xstm closely followed. Caution should be taken when handling mercury and mercury containing products. What is the warranty for the product?

Specic warnings are given in If it is not feasible, the length of time the sample is exposed to atmospheric conditions must be kept to a minimum. However, 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.

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

For decimal values up to 0. D — 08 FIG. Number s924 Tests Current edition approved Nov. 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.

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. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Consult such procedures before samples are taken. Rinse all parts thoroughly with hot tap water, then with cold tap water, followed by several rinses with distilled water. 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 axtm of surface area to sample thickness, in order to provide proper operation of the measuring equipment.