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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Note both edges fit to the edge of the gage and the disk edge fits in the radius with no gap as in Fig. Link to Active This link will always route to the current Active version of the standard.
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.
Construct the cup so that no part is less than These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material.
Record the maximum voltage reached prior to the breakdown. Originally approved in The gap shall be reset in accordance with 7. We need your help! These examples represent samples that may have large differences between replicate tests. The top of the cup shall be maintained at least The cup shall then be filled slowly with the liquid to be tested in a manner that will avoid entrapment of air.
A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. This disk is acceptable, astk, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable.
ASTM D – DIELECTRIC BREAKDOWN VOLTAGE OF LIQUIDS
Take care to avoid touching the electrodes or the inside of the cup after cleaning. Active view current version of standard.
The d877 test uses ac voltage in the power-frequency range from 45 to 65 Hz. Both sides of the gage are flush with the disk, and the edge of the disk does not fit into the gage. After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent.
The equipment should produce a straight-line voltage-time curve over the operating range of the equipment. The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids.
This standard adtm been approved for use by agencies of the Asm of Defense. Calibrate and label automatic controls in terms of rate-of-rise. Check the disk in at least four locations for each criteria.
Therefore, results of two properly conducted tests in different laboratories on the same sample of oil should not differ by more than Test Method D is not sensitive to low levels of these contaminants.
Test Vessel ASTM D877, with disc electrodes
Combining values from the two systems may result in non-conformance with the standard. The sharp edge shall have a quarter circle radius no greater than 0. Procedure A may be used once the single operator precision of X877 the cup using part of the sample. We are a non-profit group that run this website to share documents. Use the same gage size when conducting comparative tests.
Note the sharp edge fits into the radius gage and only one side of the gage fits up against the disk while the other side has considerable space. Please copy and paste this embed script to where you want to embed Embed Script.
Hipotronics TCDE Oil Dielectric Test Cell for ASTM D877 testing
These examples represent samples that may have large differences between replicate aetm. This condition requires that the disk be machined back to a sharp edge.
A low-boiling solvent should not be used as its rapid evaporation may cool the cup, causing moisture condensation.