Astm D 149 Pdf
This test method is useful for process control, acceptance or research testing. If a test set with motor-driven voltage control is available, the slow rate-of-rise test is simpler and preferable to the step-by-step test. At frequencies above Hz, dielectric heating is a potential problem. Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
For the most common test, the short-time method, voltage is applied across the two electrodes and raised from zero to dielectric breakdown at a uniform rate. Inspection Validating the specifications, value and safety of your raw materials, products and assets. 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. Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Due to copyright restrictions, we are not able to provide copies of standards.
Each of these three methods has the same basic set-up, which consists of the test specimen placed between two electrodes in air or oil. This test method covers procedures for the determination of dielectric strength of solid insulating materials at commercial power frequencies, under specified conditions. Work Item s - proposed revisions of this standard.
These procedures are the short-time method, the slow rate-of-rise method and the step-by-step method.
Detail Summary View all details. Dielectric strength is defined as the maximum voltage required to produce a dielectric breakdown through the material and is expressed as Volts per unit thickness. However, the longer-time tests, Methods B and C, which usually will give lower test results, will potentially give more meaningful results when different materials are being compared with each other. Send us a request Need help or have a question?
Standards can be obtained from appropriate standards authorities. It is suitable for use at various temperatures, and in any suitable gaseous or liquid surrounding medium. View Full Details and Buy.
The test is sometimes performed in oil to prevent arcing from the electrode to the ground. This test method is most commonly used to determine the dielectric breakdown voltage through the thickness of a test specimen puncture. The location of the failure is also recorded. Historical Version s - view previous versions of standard.
Link to Active This link will always route to the current Active version of the standard. The results obtained from Methods B and C are comparable to each other. To request a quote for this test or others Click Here. Validating the specifications, value and safety of your raw materials, products and assets. Toggle navigation Intertek.
Dielectric Breakdown Voltage and Dielectric Strength
Manage society memberships. Popular Standards Bundles. Breakdown is when an electrical burn-through punctures the sample, or decomposition occurs in the specimen. Plastics Technology Laboratories. Telecommunications Standards.
Assurance Testing Inspection Certification. This test method is not intended for measuring the dielectric strength of materials that are fluid under the conditions of test. Need help or have a question?
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Dielectric Strength ASTM D IEC
The rate of voltage rise is determined by the time it takes the sample to reach dielectric breakdown. This standard does not purport to address all of the safety concerns, if any, hydrophones pdf associated with its use.
ASTM D - National Technical Systems
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