ASTM D specifies that for insulating fluids to qualify ASTM D – Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using. Page 1. Page 2. Page 3. Page 4. ASTM D DIELECTRIC BREAKDOWN VOLTAGE OF LIQUIDS. This test method describes two procedures, A and B, for determining the electrical breakdown.
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Historical Version s – view previous versions of standard. Retain all breakdown values. We need your help! For further information refer to RR: The cup material shall not absorb moisture or the cleaning and test liquids.
Please copy and paste this embed script to where you want to embed Embed Script. Size px x x x x Breakdown in this test method is dominated by events occurring at the electrode edges.
Test Method Aatm should be used to determine the breakdown voltage of filtered and degassed liquids.
ASTM International – Standard References for ASTM D / DM – 13
Procedure A may be used once the single operator precision 8d77 has been demonstrated. The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water.
Both sides of the gage are flush with the disk, and the edge of the disk does not fit into the gage.
Automatic equipment should be used to control the voltage rate of rise because of the difficulty of maintaining a uniform voltage rise manually.
It is important to avoid touching the electrodes or the cleaned gage with the fingers or with portions of the tissue paper or chamois that have been in contact with the hands. Flush the cup using part of the sample.
Current edition approved Oct.
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D — 02e1 Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
This d8777 is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. After adjustment of the gap wstm, the cup shall be rinsed with a dry solvent. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
These examples represent samples that may have large differences between replicate tests. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Obtain the new mean breakdown value for the ten breakdowns. This standard has been approved for use by agencies of the Department of Astk. Investigate the cause of the error and repeat the tests. Procedure A may be used once the single operator precision of The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz.
The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids. In order to permit the escape of air, allow the liquid to stand in the cup for not less than 2 min and not more than 3 min before voltage is applied. The mean of the five breakdowns shall be considered the dielectric breakdown voltage of the sample, provided the range criteria of These examples represent samples that may have large differences between replicate tests.
These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. The mean of the five breakdowns may be reported as the breakdown voltage, provided the range criteria of Procedure A may be used once the single operator precision of Significance and Use 3. Report “Astm d – 02 Dielectric Xstm.
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The voltage in the test circuit should be stable enough to be practically unaffected by varying current flowing in the capacitive and resistive paths of the test circuit. Voltage Application to the Specimen Nondisruptive discharges in the test circuit should not reduce the test voltage to such an extent, and for such a time, that the disruptive discharge breakdown voltage of the test specimen is significantly affected.
If the allowable range is exceeded, the error is too large. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Last previous edition D —87 This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable.
Procedure B, modified in accordance with Section 17 of Test Methods Dis acceptable for testing silicone dielectric liquids if the requirements of 1. Combining values from the two systems may result in non-conformance with the standard.