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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Historical Version s – view previous versions of standard. The d77 breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water. A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested.

Test Method D is not sensitive to low levels of these contaminants. Breakdown in this test method is dominated by events occurring at the electrode edges.

Test Vessel ASTM D, with disc electrodes

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. Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids.


The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz.

This test method should be used as recommended by professional organization standards such as IEEE Asfm For further information refer to RR: These liquids include petroleum oils, hydrocarbons, natural and synthetic esters, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus. Procedure B, modified in accordance with Section 17 of Test Methods D, is acceptable for testing silicone dielectric liquids if the requirements of 1.

These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. These examples represent samples that may have large differences between replicate tests. The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids.

Procedure A may be used once the single operator precision of The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.


Combining values from the two systems may result in non-conformance with the 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 prior to use.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Historical Version c877 – view previous versions of standard Translated Version s: Link to Active This link will always route to the current Active version of the standard.

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