Active view current version of standard. Translated Standard: Russian. Other Historical Standards. Work Item s - proposed revisions of this standard. More D The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz.
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Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water.
A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. See Appendix X1. Test Method D is not sensitive to low levels of these contaminants.
Breakdown in this test method is dominated by events occurring at the electrode edges. The voltage stress distribution between the parallel disk electrodes used in this test method are quasi-uniform and there is substantial stress concentration at the sharp edges of the flat disk faces. Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids.
The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. It is no longer applicable to new insulating liquids upon receipt, in which case Test Method D shall be used.
It is recommended to move all new and in-service electrical discharge voltage testing of electrical insulating liquids to Test Method D For further information refer to RR:D These liquids include petroleum oils, hydrocarbons, natural and synthetic esters, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus. Procedure B, modified in accordance with Section 17 of Test Methods D , is acceptable for testing silicone dielectric liquids if the requirements of 1.
These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. These examples represent samples that may have large differences between replicate tests. The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids.
Procedure A may be used once the single operator precision of The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Scope 1.
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ASTM D877/D877M - 19
Transformer oils serve several functions. They provide dielectric strength, protect the solid insulation and facilitate heat transfer. Perhaps most importantly, they also offer a way to determine if a problem exists when looking inside the transformer. While several different dielectric fluids are used in transformers today, by far the most common are mineral oils. Of these, the majority are of naphthenic base stocks.
This test method describes two procedures, A and B, for determining the electrical breakdown voltage of insulating liquid specimens. The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. Your Alert Profile lists the documents that will be monitored. If the document is revised or amended, you will be notified by email. You may delete a document from your Alert Profile at any time.
Keys for Testing Transformer Oils
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