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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Test Method D is not sensitive to low levels of these contaminants. Resurfacing may be necessary in order to remove deep pit marks or edge damage.

Test Vessel ASTM D877, with disc electrodes

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.

Investigate the cause of the error and repeat the tests. Procedure B, modified in accordance with Section 17 of Test Methods Dis acceptable for testing silicone dielectric liquids if the requirements of 1. If this occurs, the cup should be warmed slightly to evaporate any 8. The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. Obtain the new mean breakdown value for the ten breakdowns.

The mean of the five breakdowns shall be considered the dielectric breakdown voltage of the sample, provided the range criteria of Make a voltage breakdown test as specified in this test method. Check the disk in at least four locations for each criteria. Retain all breakdown values.


During testing maintain at least two significant digits for each breakdown. These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus. The sharp edge shall have a quarter circle radius no greater than 0. If the sample shows evidence of free water, the dielectric breakdown test should be waived, and the sample shall be reported as unsatisfactory.

Note both edges fit to the edge of the gage and the disk edge fits in the radius with no gap as in Fig.

Flush the cup using part of the sample. Construct the cup so that no part is less than If dd877 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. If the allowable range is exceeded, the error is too large. Procedure B, modified in accordance with Section 17 of Test Methods Dis acceptable for testing silicone dielectric liquids if the requirements of 1.

Asym A may be used once the single operator precision of A low-boiling solvent should not be used as its rapid 8d77 may cool the cup, causing moisture condensation. Historical Version s – view previous versions of standard Translated Version s: This test method should be used as recommended by professional organization standards such as IEEE C The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids.


Calibration s shall be traceable to national standards and should be conducted annually or more often. It is the d8777 of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Test Vessel ASTM D, with disc electrodes

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. For further information refer to RR: A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested.

Alternate procedures utilizing electrode shapes and configurations similar to those in the apparatus and in Test Method D should be used for oil-filled equipment utilizing well-rounded and insulated electrodes. Current edition approved Oct.