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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Please copy and paste this embed script to where you want to embed Embed Script. These examples represent samples that may have large differences between replicate tests. This standard has been approved for use by agencies of the Department of Defense. Combining values from the two systems may result in non-conformance with the standard.
The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids. For axtm problems resurfacing may be required. Voltage Application to the Specimen Clean and prepare the cup in accordance with 7.
Test Vessel ASTM D877, with disc electrodes
Automatic equipment should be used to control the voltage rate of rise because of the difficulty of maintaining a uniform voltage rise manually. Resurfacing may be necessary in order to remove deep pit marks or edge damage.
During testing, maintain at least two significant digits for each breakdown.
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. Apply the test voltage as specified in Section 4 until operation of the interrupting equipment. Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids.
Record the maximum voltage reached prior to the breakdown. Test Method D is not sensitive to low levels of these contaminants.
ASTM International – Standard References for ASTM D / DM – 13
The gap shall be reset in accordance with 7. This test method should be used as recommended by professional organization standards such as IEEE C Astj low-boiling solvent should not be used as its rapid evaporation may cool the cup, causing moisture condensation. Current edition approved Oct. Calibrate and label automatic controls in terms of rate-of-rise.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are asm provided as part of the standard. Therefore, results of two properly conducted tests by the same operator on the same sample should not differ by more than The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz.
Hipotronics TCDE Oil Dielectric Test Cell for ASTM D877 testing
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Flush the cup xstm part of the sample. Precision and Bias The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water.
Nondisruptive discharges in the test circuit should not reduce the test voltage to such an extent, and for such a time, that asym disruptive discharge breakdown voltage of the test specimen is significantly affected. The top of the cup shall be maintained at least A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested.
Please fill this form, we will try to respond as soon as possible. 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.
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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. Adjustment and Care of Electrodes and Test Cup 7. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Test Vessel ASTM D, with disc electrodes
This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable. Procedure B, modified in accordance with Section 17 of Test Methods D, is acceptable for testing silicone dielectric liquids if the requirements of 1.
Breakdown in this test method is dominated by events occurring at the electrode edges. 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.
Procedure A may be used once the single operator precision of Both sides of the gage are flush with the disk, and the edge of d8877 disk does not fit into the gage. Report “Astm d – 02 Dielectric Breakdown”. If xstm allowable range is exceeded, the error is too large.
The cup shall then be filled slowly with the liquid to be tested in a manner that will avoid entrapment of air. The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. For further information refer to RR: After the electrodes have been reinstalled in the test cup, clean and adjust spacing in accordance with 7.
Last previous edition D —87 Historical Version s – view previous versions of standard Translated Version s: A low result in this test method indicates d77 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.