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 gap shall be reset in accordance with 7. A low result in this test method indicates the presence of significant concentrations of one or more of these contaminants in the liquid tested. The cup material shall not absorb moisture or the cleaning and test liquids.
Automatic equipment should be used to control the voltage rate of rise because e877 the difficulty of maintaining a uniform voltage rise manually. Please fill this form, we will try to respond as soon as possible. Use the same gage size when conducting comparative tests.
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time by the responsible technical committee and must be reviewed every five years and if not revised, atm reapproved or withdrawn.
Link to Active This link will always route to the current Active version of the standard. Historical Version s – view previous versions of standard Translated Version s: In order that a representative test specimen containing the impurities may be obtained, invert and swirl the sample container several times before filling the test cup.
Note both edges fit to the edge of the gage and the disk edge fits in the radius with no gap as in Fig. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. If the range is acceptable, report this mean value as the dielectric breakdown voltage.
Retain all breakdown values. The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids. Make a voltage breakdown test as specified in this test method. This can be accomplished by repeated wiping with lint-free tissue paper saturated with a suitable solvent such as petroleum etherfollowed by solvent rinsing or ultrasonic cleaning.
Both sides of the gage are flush with the disk, aatm the edge of the disk does not fit into the gage. 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. Originally approved in Last previous edition D —87 The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids.
The breakdown test uses ac astj in the power-frequency range from 45 to 65 Hz.
We need your help to maintenance this website. 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. Procedure A may be used once the single operator precision of The mean of the five breakdowns shall be considered the dielectric breakdown voltage of the sample, provided the range criteria of We need your help!
During testing maintain at least two significant digits for each breakdown.
The cup shall be designed to permit easy removal of the electrodes for cleaning and polishing, verification that the sharp edge is within the specified tolerance, and to permit easy adjustment of the gap spacing. Asm you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
ASTM International – Standard References for ASTM D / DM – 13
Therefore, results of two properly conducted tests in different laboratories on the same sample of oil should not differ by more than Link to Active This link will always route to the current Active version of the standard. Referenced Documents purchase separately R877 documents listed below are referenced within the subject standard but are not provided as part of the standard. These examples represent samples that may have large differences between replicate tests.
During testing, maintain at least two significant digits for each breakdown.
Retain all breakdown test values. If pitting or scratches of the disk faces are found, examine the electrodes in accordance with 7.
Astm d 877 – 02 Dielectric Breakdown
When testing high-viscosity liquids in this range, the sample should be allowed to stand until it reaches room temperature. Procedure A or Procedure B, Record the maximum voltage reached prior to the breakdown. These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus. Size px x x x x The cup shall then be filled slowly with the liquid to be tested in a manner that will avoid entrapment of air.
We are a non-profit group that run this website to share documents. Current edition approved Oct. The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water.
A number in parentheses indicates the year of last reapproval. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. Therefore, results of two properly conducted tests by the same operator on the same sample should not differ by more than All residue from the buffing must be removed before the electrodes are reinstalled in the test cup.
The sample container should not be swirled as prescribed in 8. A decrease in dielectric strength of the liquid can have an accentuated effect on the electric creepage strength of the solid insulating materials immersed in the liquid. The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz.
After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent. Construct the electrodes of polished brass as disks The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz.