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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Unless otherwise specied the upper electrodes shall be 50 6 2 g.

This type of failure, usually associated with slowrise tests at elevated temperatures, may in some cases be reversible, that is, recovery of the dielectric strength may occur if the specimen is allowed to cool to its original test temperature before reapplying voltage. Do not use another document, including those listed in this appendix, as a model for reference to this test method unless there is conformity with 5.

Originally approved in Standards which refer to this method need to determine for the material with which that standard is concerned the applicability of this precision statement to that particular material.

Test results are also affected by the electrode geometry. It should also be noted that if the solid is porous or capable of being permeated by the immersion medium, the breakdown strength of the solid is directly affected by the electrical properties of immersion medium. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

When making duplicate tests on? Need help or have a question?

Because of this it is important to measure the concentration of ozone in the atmosphere, using commercially available monitoring devices, whenever the odor of ozone is persistently present or when ozone generating conditions continue. Care must be taken in machining specimens not to contaminate or mechanically damage them.

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Dielectric Strength ASTM D149, IEC 60243

A number of different physical arrangements of voltage source, measuring equipment, baths or ovens, and electrodes are possible, but it is essential that 1 all gates or doors providing access to spaces in which there are electrically energized parts be interlocked to shut off the voltage source when opened; 2 clearances are sufficiently large that the eld in the area of the electrodes and specimen are not distorted and that ashovers and partial discharges corona do not occur except between the test electrodes; and 3 insertion and replacement of specimens between tests be as simple and convenient as possible.

For this reason it is important that the electrodes to be used be described when specifying this test method, and that they be described in the report. Generally speaking, the effect of the electrode material is difficult to establish because of the scatter of experimental data.

It is acceptable to use other electrodes as speci? Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. First, the condition of a material as installed in apparatus is much different from its condition in this test, particularly with regard to the d149-7a Current edition approved March 1, Due to copyright restrictions, we are not able to provide copies of standards.

It may be necessary to run one or two preliminary tests in order to determine the most suitable rate-of-rise. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

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In general, the dielectric strength will decrease with increasing temperatures, but the extent satm which this is true depends upon the material under test.

For this reason it is important that the electrodes to be used be described when specifying this test method, and that they be described in the report. If d149-97z occurred while the voltage was being increased to the starting voltage the failure time shall be zero. Aastm the addition of instructions modifying Sectionthis test method may be used for proof testing.

D — 97a 9. This critical eld intensity is called the intrinsic dielectric strength.

Dielectric Strength ASTM D, IEC

The material of the gaskets or seals around the electrodes has the potential to in? For such materials, the bath must be of such design that it will not be necessary to expose the specimens to air before testing.

Design test equipment, test chambers, and test specimens so as to minimize the possibility of such occurrences and to eliminate the possibility of personal injury. If the time to breakdown cannot be adhered to, the time shall be made a part of the report. Transformer oil is usually specied and its dielectric 9 Whitehead, S. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM D1499-7a Headquarters.

D — 09 controlled, it is possible that the precisions cited in For such materials, the conditioning shall be included in the standard referencing this test method.