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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During testing maintain at least two significant digits for each breakdown. A number in parentheses indicates the year of last reapproval.
ASTM International – Standard References for ASTM D / DM – 13
Historical Version s wstm view previous versions of standard. If pitting or scratches of the disk faces are found, examine the electrodes in accordance with 7. The sharp edge shall have a quarter circle radius no greater than 0.
Precision and Bias If this occurs, the cup should be warmed slightly to evaporate astn 8. If the range e877 acceptable, report this mean value as the dielectric breakdown voltage. Prior to starting the test, the sample shall be inspected for the presence of moisture, sludge, metallic particles, or other foreign matter. This standard has been approved for use by agencies of the Department of Defense. Rapid agitation is undesirable, since an excessive amount of air may be introduced into the liquid.
A decrease in dielectric strength of the liquid can have an accentuated effect on the electric creepage strength of the solid insulating materials immersed in the liquid.
Resurfacing may be necessary in order to remove deep pit marks or edge damage. Procedure A or Procedure B, Obtain the new mean breakdown value for the ten breakdowns.
Please help us to share x877 service astj your friends. Procedure A may be used once the single operator precision of Retain all breakdown test values. After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent. The gray area represents the disk and the white area represents the gage.
These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus.
This test method should be used as recommended by professional organization standards such as IEEE C This condition requires that the disk be machined back to a sharp edge.
During testing, maintain at least two significant digits for each breakdown. It is important to avoid touching the electrodes or the cleaned gage with the fingers asym with portions of the tissue paper or chamois that have been in contact with the hands.
Test Vessel ASTM D877, with disc electrodes
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. Refer to Annex A1 for illustrations of measuring edge radius. This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable. Apply the test voltage as specified in Section 4 until operation of the interrupting equipment.
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 breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. Record on the label of the sample container identification of the device from which the sample was obtained, the date, and temperature of the sample at the time of collection Note 1.
It is the responsibility of d8777 user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 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.
For further information refer to RR: Both sides of the gage are flush with the disk, and the edge of the disk does not fit into the gage. Combining values from the two systems may result in non-conformance with the standard. The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz.
Astm d – 02 Dielectric Breakdown – Free Download PDF
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. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material.
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A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. It is recommended that the circuit design limit the disruptive current duration and magnitude to low values that will minimize damage to the disks and limit formation of non-soluble materials resulting from the breakdown, but consistent with the requirements of 4. If aztm sample shows evidence of free water, the dielectric breakdown test should be waived, and the sample shall be reported as unsatisfactory.
The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water. Record the maximum voltage 8d77 prior to the breakdown. This d8877 method should be used as recommended by professional organization standards such as IEEE C