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

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. This test method should be used as recommended by professional organization standards such as IEEE C Construct the cup so that no part is less than Report “Astm d – 02 Dielectric Breakdown”.

Record the maximum voltage reached prior to the breakdown. Voltage Application to the Specimen This condition requires that the disk asrm machined back to a sharp edge. A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested.

It is the responsibility of the d877 of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. It should be filled to a level not less than During testing maintain at least two significant digits for each breakdown.

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ASTM D – DIELECTRIC BREAKDOWN VOLTAGE OF LIQUIDS

The gray area represents the disk and the white area represents the gage. Test Method D is not sensitive to low levels of these contaminants. After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent.

The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water. It is important to avoid touching the electrodes or the cleaned gage with the fingers or with portions of the tissue paper or chamois that have been in contact with the hands.

Test Vessel ASTM D877, with disc electrodes

It is recommended that the circuit design limit the disruptive current duration and magnitude to low values that will minimize damage to the disks and limit formation of non-soluble materials resulting from the breakdown, but consistent with the requirements of 4. A low-boiling solvent should not be used as its rapid evaporation may cool the cup, causing moisture condensation. Make a voltage breakdown test as specified in this test method.

Astmm you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Asgm, at the address shown below.

ASTM International – Standard References for ASTM D / DM – 13

These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, cables, and d8777 apparatus. This test method should be used as recommended by professional organization standards such as IEEE C The sample container should not be swirled as prescribed in 8.

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This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. Procedure B, modified in accordance with Section 17 of Test Methods D, is acceptable for testing silicone dielectric liquids if the requirements of 1.

A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested.

Last previous edition D —87 Breakdown in this test method is dominated by events occurring at the electrode edges. Adjustment and Care of Electrodes and Test Cup 7.

Hipotronics TCDE Oil Dielectric Test Cell for ASTM D877 testing

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

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Retain all breakdown values. The gap shall be reset in accordance with 7. During testing, maintain at least two significant digits for each breakdown.