ASTM D149-97A PDF

Buy ASTM Da() Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at. Dielectric Strength ASTM D, IEC Scope: Dielectric Strength is a measure of the electrical strength of a material as an insulator. Dielectric strength is. ASTM DA – Designation: D – 97a (Reapproved ) An American National Standard Standa.

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Caution—The use of glass containers is not recommended for tests at voltages above about 10 kV, because the energy released at breakdown may be sufficient to shatter the container. The exposure limits are set by governmental agencies and are usually based upon recommendations made by the American Conference of Governmental Industrial Hygienists. It shall have a dielectric breakdown voltage as determined by Test Method D of at least 26 kV.

Set the sensing element to respond to a current that is indicative of specimen breakdown as dened in Visual observation of the astk and test specimen during the test is frequently desirable.

Dielectric Strength ASTM D, IEC

Breakdown may then occur astn of thermal instability of the material. However, this test method may be used at any frequency from 25 to Hz. Tests made with horizontal electrodes should not be directly compared with tests made with vertical electrodes, particularly when the tests are made in a liquid surrounding medium.

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Send us a request Wilton UK: Unless otherwise specied, measure the thickness after the test in the immediate vicinity of the area of breakdown. In any event the electrodes must be described in the report. This is to be expected because the thermal breakdown mechanism is time-dependent and the discharge mechanism is usually time-dependent, although in some cases the latter mechanism may astn rapid failure by xstm critically high local eld intensitives. Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.

Dielectric Strength ASTM D149, IEC 60243

Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. See also Appendix X1. These processes may continue until a complete failure path is formed between the electrodes.

If the items listed in 5. Make the setting high enough that transients, such as partial discharges, will not trip the breaker but not so high that excessive burning of the specimen, with resultant electrode damage, will occur on breakdown.

They are less critical as to concentricity of the electrodes than are the Types 1 and 2 electrodes. Through our network of over 43, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a ast range of industries around the world.

This study made use asym one electrode system and one test medium. For thin materials it will often be convenient to use specimens large enough to permit making more than one test on a single piece.

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In this case, the times to failures shall be made a part of the report. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

D — 97a Summary of Test Method 4. Repeated applications of voltage will sometimes result in failure at lower voltages sometimes unmeasurably lowusually with additional damage at the breakdown area. If no electrodes have been speci? For most d149-97w, using electrodes similar to d1499-97a shown in Table 1, an output current capacity of 40 mA is usually satisfactory.

It may also be used to determine dielectric breakdown voltage along the interface between a solid specimen and a gaseous or liquid surrounding medium ash1 This test method is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee D Summary of Test Method 4.

The electrode area is likely to have a signi? Breakdown may then occur because of thermal instability of the material. The last approved version of this historical standard is referenced on www.

This will usually reduce the probability of surface ashover. Assurance Testing Inspection Certification.