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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Astm d – 02 Dielectric Breakdown – Free Download PDF
Retain all breakdown values. 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.
If this occurs, the cup should be warmed slightly to evaporate any 8.
Note both edges fit to the edge of the gage and the disk edge fits in the radius with no gap as in Fig. The top of the cup shall be maintained at least Voltage Application to the Specimen Test Method D8777 is not sensitive to low levels of these contaminants.
Astm d 877 – 02 Dielectric Breakdown
Procedure A may be used once the single operator precision of Record the maximum voltage reached prior to the breakdown.
Rapid agitation is undesirable, since an excessive amount of air may be introduced into the liquid. During testing, maintain at least two significant digits for each breakdown. Therefore, results of two properly conducted tests by the same operator on the same sample should not differ by more than Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids.
Make a voltage breakdown test as specified in this test method. Both sides of the gage are flush with the disk, and the edge of the disk does not fit into the gage.
Hipotronics TCDE Oil Dielectric Test Cell for ASTM D testing – Mitchell Instrument Company
A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. Retain all breakdown test values. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
A low-boiling solvent should not be used as its rapid evaporation may cool the cup, causing moisture condensation. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material.
Apply the test voltage as specified in Section 4 until operation of the interrupting equipment. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
If the range is acceptable, report this mean value as the dielectric breakdown voltage. Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids. Use the same gage size when conducting comparative tests.
Test Vessel ASTM D877, with disc electrodes
Link to Active This link will always route to the current Active version of the standard. After the electrodes have been reinstalled in the test cup, clean and adjust spacing in accordance with 7. Historical Version s – view previous versions of standard Translated Version s: Construct the cup so that no part is less than The gray area represents the disk and the white area represents the aztm.
Please help us to share our service with your friends. These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, ast, and similar apparatus.
Refer to Annex A1 for illustrations of measuring edge radius. Prior to starting the test, the sample shall be inspected for the presence of moisture, sludge, metallic particles, or other foreign matter.