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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If the allowable range is exceeded, the error is too large.
Hipotronics TCDE Oil Dielectric Test Cell for ASTM D testing – Mitchell Instrument Company
Both sides of the gage are flush with the disk, and the edge of the disk does not fit into the gage. A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. The mean of the five breakdowns may be reported d8877 the breakdown voltage, provided the range criteria of Clean and prepare the cup in accordance with 7.
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.
Hipotronics TCDE Oil Dielectric Test Cell for ASTM D877 testing
Link to Active This link will always route to the current Active version of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Current edition approved Oct. Nondisruptive discharges in the test circuit should not reduce the test voltage to such an extent, and for such aztm time, that the disruptive discharge breakdown voltage of the test specimen is significantly affected.
Refer to Annex A1 for illustrations of measuring edge radius. A number in parentheses indicates the year of last reapproval. The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water.
Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids. During testing, maintain at least two significant digits for each breakdown.
We need your help to maintenance this website. If a second series of five breakdowns is required fill the cup with a new specimen in accordance with 8.
Combining values from the two systems may result in non-conformance with the standard. After the electrodes have been reinstalled in the test cup, clean and adjust spacing in accordance with 7.
In order to permit the escape of air, allow the liquid to stand in the cup for not adtm than 2 min and not more than 3 min before voltage is applied. The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids. The gap shall be reset in accordance with 7.
Astm d – 02 Dielectric Breakdown – Free Download PDF
A low-boiling solvent should not be used as its rapid evaporation may cool the cup, causing moisture condensation. If this occurs, the cup should be warmed slightly zstm evaporate any 8. These examples represent samples that may have large differences between replicate tests. If the breakdown voltage is judged in the proper range for the sample with a known breakdown value, the test cup is prepared for testing other samples.
Test Vessel ASTM D877, with disc electrodes
We need your help! Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard 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. Procedure A or Procedure B, Rapid agitation is undesirable, since an excessive amount of air may be introduced into the liquid.
Originally approved in Note both edges fit to the edge of the gage and the disk edge fits in the radius with no gap as in Fig. This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable. After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent. Use the aetm gage size when conducting comparative tests.
Significance and Use 3. The sample container should not be swirled as prescribed in 8.
This test method should be used as recommended by professional organization standards such as IEEE C The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water. Investigate the cause of the error and repeat the tests. These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus.
If the sample shows evidence of free water, the dielectric breakdown test should be waived, and the sample shall be reported as unsatisfactory. 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.
A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. Calibration s shall be traceable to national standards and should be conducted annually or more often. Construct the cup so that no part is less than This test method should be used as recommended by professional organization standards such as IEEE C If a value lower than expected is obtained, flush or clean the cup as necessary until test results meet the expected value for the known sample.
For further information refer to RR: In order that a representative test specimen containing the impurities may be obtained, invert and swirl the sample container several times before filling the test cup.