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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Metals that have been found satisfactory from this standpoint are gold, nickel, Monel, platinum, and stainless steel. Due regard should be given to the precautions outlined in Section 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.

For tests at room temperature the unheated oven can be conveniently used as the test chamber. Cleaning Test Cell 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.

Internal standard capacitor electrode type capacitor,with electrode spacing 2mm.

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

Wooden Box with Foam Inside. Asm box with foam inside, 3. Leakage across these paths has been found to produce an unsteady bridge balance on some bridges.

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 atm acceptable chemical and heat transfer properties. 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. Samples to be subjected to this test should preferably be obtained through a closed system.

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The alignment of the electrodes shall not be inuenced by this temperature nor by the operation of lling the cell with the test ashm.

How do you ship the products? The oven must be capable of meeting the temperature requirements set out in Section Some liquids, such as oils of petroleum origin, undergo changes when exposed to sunlight.

D9924 This is not what you are looking for? Tests at higher stresses are desirable but shall not reach such values that electrical discharges across the cell insulating surfaces occur or that internal ionization of the specimen may be expected.

The concentric cylinders are of nickel-plated brass which are mounted on a TFE-uorocarbon base and d942 in an mL borosilicate glass beaker.

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

Solvents mentioned in Caution should be taken when handling mercury and mercury containing products. We have a strong team including top sales, skilled sstm and we have our own manufacture with high quality. Historical Version s – view previous versions of standard Translated Version s: Plated surfaces that may be satisfactory for testing liquids having low acidity and for short periods of ast, are gold, platinum, nickel, chromium over nickel, or rhodium.

Shipped in 15 days after payment. If the difference in the measurements of the two test specimens is greater than 0.

HS code is ; 2. Huazheng Electric Manufacturing Baoding Co. 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.

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Take care that the surfaces on which the component parts of the cell are placed in the oven are clean.

Last previous edition approved in as D — Once receive your question, the supplier will answer you as soon as possible. Caution astn be taken when handling mercury and mercury containing products.

Use a perforated ceramic plate or disk to insulate the test cell from the metal ooring of the oven if the ooring is not insulated from the oven. The reported value of D or PF may be expressed as a decimal value or as a percentage. Where this applies, it is imperative that each laboratory evolves a good cleaning procedure for the cell used so that repeatable results can be obtained. Link to Active This link will always route to the current Active version of the standard.

ASTM D液体绝缘材料介质损耗测试法_百度文库

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. Contact Supplier Start Order. 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.

On some instruments the cell must be in place before lling with specimen.