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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Construct the cup so that no part is less than The mean of the five breakdowns may be reported as the breakdown voltage, provided the range criteria of A low-boiling solvent should not be used as its rapid evaporation may cool the cup, causing moisture condensation.
The use of Procedure B will result in a more accurate value of breakdown voltage when testing such liquids. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Significance and Use 3. 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. This standard s877 subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, s877 reapproved or withdrawn.
Procedure A may be used once the single operator precision of has been demonstrated.
ASTM D – DIELECTRIC BREAKDOWN VOLTAGE OF LIQUIDS
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. Adjustment and Care of Electrodes and Test Cup 7. Voltage Application to the Specimen This test method should be used as recommended by professional organization standards such as IEEE C A low result in this test method indicates asfm presence of significant concentrations of one or more of these contaminants in the liquid tested.
Automatic equipment should be d77 to control the voltage rate of rise because of the difficulty of maintaining a uniform voltage rise manually. Clean and prepare the cup in accordance with 7.
Breakdown in this test method is dominated by events occurring at the electrode edges. Report “Astm d – 02 Dielectric Breakdown”.
Breakdown in this test method is dominated by events occurring at the electrode edges. Flush the cup using part of the sample. These examples represent samples that may have large differences between replicate tests. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D — 02e1 Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Ast 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 d87, the year of last revision.
We need your help to maintenance this website. This standard has been approved for use by agencies of the Department of Defense. The mean of the five breakdowns shall be considered the dielectric breakdown voltage of the sample, provided the range criteria of These may include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material.
These examples represent samples that may have large differences between replicate asstm. 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. The sample container should not be swirled as prescribed in 8.
If the sample shows evidence of free water, the dielectric breakdown test should be waived, and the sample shall be reported as unsatisfactory. Thank you for interesting in our services. These ast include samples taken from circuit breakers, load tap changers, and other liquids heavily contaminated with insoluble particulate material.
Calibrate and label automatic controls in terms of rate-of-rise. 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. During testing maintain at least two significant digits for each breakdown.
Test Vessel ASTM D877, with disc electrodes
Apply the test voltage as specified in Section 4 until operation of the interrupting equipment. Zstm 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. 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 Check the disk in at least four locations for each criteria.
Hipotronics TCDE Oil Dielectric Test Cell for ASTM D877 testing
The gap shall be reset in accordance with 7. Current edition approved Oct. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Note both edges fit to the edge of the gage and the disk edge fits in the radius with no gap as in Fig. Refer to Annex A1 for illustrations of measuring edge radius.
Axtm further information refer to RR: 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.
Please copy and paste this embed script aatm where you want to embed Embed Script. The voltage in the test circuit should be stable enough to be practically unaffected by varying current flowing in the capacitive aetm resistive paths of the test circuit. Precision and Bias We need your help!