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 mean of the five breakdowns shall be considered the dielectric breakdown voltage of the sample, provided the range criteria of Alternate procedures utilizing electrode shapes and configurations similar to those in the apparatus and in Test Method D should be used for oil-filled ast utilizing well-rounded and insulated electrodes.
Voltage Application to the Specimen If this occurs, the cup should be warmed slightly to evaporate any 8.
Record the temperature of the sample and ambient temperature. These examples represent samples that may have large differences between replicate tests. This test method should be used as recommended by professional organization standards such as IEEE C A decrease in dielectric strength of the liquid can d8877 an accentuated effect on the electric creepage strength of the solid insulating materials immersed in the liquid. Rapid agitation is undesirable, since an excessive amount of air may be introduced into the liquid.
Prior to starting the test, the sample shall be inspected for the presence of moisture, sludge, metallic particles, or other foreign matter.
For further information refer dd877 RR: Apply the test voltage as specified in Section 4 until operation of the interrupting equipment. Please help us to share our service with your friends.
If the allowable range is exceeded, the error is too large. These examples represent samples that may have large differences between replicate tests.
Astm d – 02 Dielectric Breakdown – Free Download PDF
After the electrodes have been reinstalled in the test cup, clean and adjust spacing in accordance with 7. We need your help to maintenance this website. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested.
Construct the electrodes of polished brass as disks The cup material shall not absorb moisture or the cleaning and test liquids. Procedure B, modified in accordance with Section 17 of Test Methods Dis acceptable for testing silicone dielectric liquids if the requirements of 1. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. Please copy and paste this embed script to where you want to embed Embed Script.
Active view current version of standard. The mean of the five breakdowns may be reported as the breakdown voltage, provided the range criteria of Historical Version s – view previous versions of standard Translated C877 s: The voltage in the test circuit should be stable enough to be practically unaffected by varying current flowing in the capacitive and resistive paths of the test circuit.
Test Vessel ASTM D877, with disc electrodes
Fill the cup with a specimen from a sample with a known breakdown voltage. This standard is aetm 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 A may be used once the single operator precision of has been demonstrated.
Investigate the cause of the error and repeat the tests. 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 superscript epsilon e indicates an editorial change since the last revision or reapproval.