ASTM D877 PDF
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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Astm d – 02 Dielectric Breakdown – Free Download PDF
The equipment should produce a straight-line voltage-time curve over the operating range of the equipment. Combining values from the two systems may result in non-conformance with the standard.
After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent.
If the allowable range is exceeded, the error is too large. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. If the breakdown voltage is judged in the proper astj for the sample with a known breakdown value, the test cup is prepared for testing other samples.
This test method should be used as recommended by professional organization standards such as IEEE C Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Immediately after agitation, use a small portion of the sample to rinse the test cup. Current edition approved Oct. It is important to avoid touching the electrodes or the cleaned gage with the fingers or with portions of the tissue ast or chamois that have been in contact with the hands.
The sharp edge shall have a quarter circle radius no greater than 0. The gray area represents the disk and the white area represents the gage.
The voltage stress distribution between the parallel disk electrodes used in this test method are quasi-uniform and there astn substantial stress concentration at the sharp edges of the flat astk faces. The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water.
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.
ASTM International – Standard References for ASTM D / DM – 13
These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. The top of the cup shall be maintained at least A low-boiling solvent should not be used as its rapid evaporation may cool the d8777, causing moisture condensation.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The power-frequency breakdown voltage of a liquid is reduced by the presence v877 contaminants such as cellulosic fibers, conducting particles, dirt, and water.
Flush the cup using part of the sample. This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable. D — 02e1 Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes1 This standard 8d77 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.
We need your help! When testing high-viscosity liquids in this range, the sample should be allowed to stand until it reaches room temperature.
Astm d 877 – 02 Dielectric Breakdown
If a second series of five breakdowns is required fill the cup with a new specimen in accordance with 8. Link to Active This link will always route to the current Active version of the standard.
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 asym the breakdown voltage, provided the range criteria of Construct the electrodes of polished brass as disks Active view current version of standard.
During testing, maintain at least two significant digits for each breakdown.
Test Vessel ASTM D877, with disc electrodes
Test Method D is not sensitive to low d8777 of these contaminants. If the range is acceptable, report this mean value as the dielectric breakdown voltage.
Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids.