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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These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus.
Astm d – 02 Dielectric Breakdown – Free Download PDF
Note the sharp edge fits into the radius gage and only one side of the gage fits up against the disk while the aastm side has considerable space. Test Method D is not sensitive to low levels of these contaminants.
This can be accomplished by repeated wiping axtm lint-free adtm paper saturated with a suitable solvent such as petroleum etherfollowed by solvent rinsing or ultrasonic cleaning.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of d87 standard. Retain all breakdown values.
The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus. 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.
Active view current version of standard.
This standard has been approved for use by agencies of the Department of Defense. During testing maintain at least two significant digits for each breakdown.
Obtain the new mean breakdown value for the ten breakdowns. The mean of the five breakdowns shall be considered the dielectric breakdown voltage of the sample, provided the range criteria of 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.
If pitting or scratches of the disk faces are found, examine the electrodes in accordance with 7. This test method should be used as recommended by professional organization standards such as IEEE C Historical Version s – view previous versions of standard.
Immediately after agitation, use a small portion of the sample to rinse the test cup. These examples represent samples that may have large differences between replicate tests. A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. We need your help!
Adjustment and Care of Electrodes and Test Cup 7. Flush the cup using part of the sample.
Test Vessel ASTM D877, with disc electrodes
The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids. All residue from the buffing must d877 removed before the electrodes are reinstalled in the test cup. The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. The adjustment is made with a standard round gage of 2. We are a non-profit group that run this website to share documents.
Refer to Annex A1 for illustrations of measuring edge radius. After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent. 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. The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and aastm.
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.
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. Breakdown in this test method is dominated by events occurring at the electrode edges. Link to Active This link will always route to the current Active version of the standard. The mean of the five breakdowns may be reported as the breakdown voltage, provided the range criteria of This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable.