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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Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
The top of the cup shall be maintained at least D — astmm 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. Historical D8877 s – view previous versions of standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations e877 to use.
Procedure A or Procedure B, A low-boiling solvent should not be used as its rapid evaporation may cool the cup, causing moisture condensation.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.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 B, modified in accordance with Section 17 of Test Methods Dis acceptable for testing silicone dielectric liquids if the requirements of 1. The cup material shall not absorb moisture or the cleaning and test liquids.
Originally approved in 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. Record the maximum voltage reached prior to the breakdown. 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.
Make a voltage breakdown test as specified in this test method. Procedure A may be used once the single operator precision of has been demonstrated. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Construct the electrodes of polished brass as disks Calibrate and label automatic controls in terms of rate-of-rise.
This test method should be used as recommended by professional organization standards such as IEEE C The sharp edge shall have a quarter circle radius no greater than 0. The breakdown test uses ac f877 in ast power-frequency range from 45 to 65 Hz.
ASTM International – Standard References for ASTM D / DM – 13
We are a non-profit group that run this website to share documents. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids. Refer to Annex A1 for illustrations of measuring edge radius.
Test Method D is not sensitive to low levels of these contaminants.
This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable. Clean and prepare the cup in accordance with 7. We need your help to maintenance this website.
Test Vessel ASTM D877, with disc electrodes
Fill the cup with a specimen from a sample with a known breakdown voltage. The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water. 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.
After the electrodes have been reinstalled in the test cup, clean and adjust spacing in accordance with 7. This test method should be used as recommended by professional organization standards such as IEEE C A number in parentheses indicates the year of last reapproval.