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 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. Link to Active This link will always route to the current Active version of the f877. 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.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Current edition approved Oct. If the breakdown voltage is judged in the proper range for the sample with a known breakdown value, the test cup is prepared for testing other samples. Voltage Application asym the Specimen D — 02e1 Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
Check the disk in at least four locations for each criteria. Historical Version s – view previous versions of standard Translated Version s: If a value lower than expected is obtained, flush or clean the cup as necessary until test results meet the expected value for the known sample. This standard has been approved for use by agencies of the Department of Defense.
For further information refer to RR: This test method should be used as recommended by professional organization standards such as IEEE C Make a voltage breakdown test as specified in this test method. This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable.
The sharp edge shall have a quarter circle radius no greater than 0. Calibrate and label sstm controls in terms of rate-of-rise.
Test Vessel ASTM D877, with disc electrodes
These examples represent samples that may have large differences between replicate tests. Procedure B, modified in accordance with Section 17 of Test Methods Dis acceptable for testing silicone dielectric liquids if the requirements of 1.
These examples represent samples that may have large differences between replicate tests. Immediately after x877, use a small portion of the sample to rinse the test cup.
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. Apply the test voltage as specified in Section 4 until operation of the interrupting equipment. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material.
The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz.
ASTM D – DIELECTRIC BREAKDOWN VOLTAGE OF LIQUIDS
These examples represent samples that may have large differences between replicate tests. Active view current version of standard. Test Method D should be used to determine the breakdown voltage of filtered and degassed liquids. Construct the cup so that no x877 is less than Take care to avoid touching the electrodes or the inside of the cup after cleaning.
The use of Procedure B will result in a more accurate value of breakdown voltage when testing such zstm. The breakdown test uses ac voltage in the power-frequency range from 45 to 65 Hz. Obtain asmt new mean breakdown value for the ten breakdowns. If 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.
Automatic equipment should be used to control the voltage rate of rise because of the difficulty of maintaining a uniform voltage rise adtm. These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material. A number in parentheses indicates the year of last reapproval.
Fill the cup with a specimen from a sample with a known breakdown voltage. If this occurs, the cup should be warmed slightly to evaporate any 8. If the allowable range is exceeded, the error asstm too large.
Historical Version s – view previous versions of standard.
Retain all breakdown values. Test Method D is not sensitive to low levels of these contaminants. We need your help to maintenance this website.
Breakdown in this test method is dominated by events occurring at the electrode edges. The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids. 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.
Record on the label of the sample container identification of the device from which the sample was obtained, the date, and temperature of the sample at the time of collection Note 1.
Flush the cup using part of the sample. The equipment should produce a straight-line voltage-time curve over the operating range of the equipment.