Astm d877 free download

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The breakdown test uses ac voltage in the breakdown of silicone fluid as specified in Test Methods power-frequency range from 45 to 65 Hz. D, provided the discharge energy into the sample is less than 20 mJ milli joule per breakdown for five consecutive 1.

See Specification D, Specification 1. This test method should do not completely settle from the space between the disks be used as recommended by professional organization stan- during the 1—min interval required in Procedure A.

B, modified in accordance with Section 17 of Test Methods D, is acceptable for testing silicone dielectric liquids if the 1.

These may include samples taken from circuit breakers, load 1. These examples represent this test method to the presence of water is decreased. For samples that may have large differences between replicate further information refer to RR:D The use of Procedure B will result in a more accurate 1. Procedure A may be used once the single operator voltage of liquids in which any insoluble breakdown products precision of These liquids include petroleum oils, are to be regarded separately as standard.

The values stated in hydrocarbons, natural and synthetic esters, and askarels PCB each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Combining values from the two systems may result in non-conformance 1 This test method is under the jurisdiction of ASTM Committee D27 on with the standard. Published January Originally safety concerns, if any, associated with its use. It is the approved in Last previous edition approved in as D—02 DOI: responsibility of the user of this standard to establish appro- No further reproductions authorized.

Referenced Documents before being placed into service. Test Method D should be 2. Calibration s shall be traceable to D Specification for Natural Vegetable Oil Ester Fluids national standards and should be conducted annually or more Used in Electrical Apparatus often. The voltage Testing waveshape should approximate a sinusoid with both half cycles C Significance and Use 4. The 3. 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.

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, either reapproved or withdrawn. Procedure A or Procedure B, Rapid agitation is undesirable, since an excessive amount of air may be introduced into the liquid.

Originally approved in Note both edges fit to the edge of the gage and the disk edge fits in the radius with no gap as in Fig. This disk is acceptable, however, consideration should be given to machining the disk to a sharp edge because any degradation will make it unacceptable.

After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent. Use the aetm gage size when conducting comparative tests.

This test method should be used as recommended by professional organization standards such as IEEE C The power-frequency breakdown voltage of a liquid is reduced by the presence of contaminants such as cellulosic fibers, conducting particles, dirt, and water. Investigate the cause of the error and repeat the tests. These liquids include petroleum oils, hydrocarbons, and askarels PCB used as insulating and cooling liquids in transformers, cables, and similar apparatus.

If the sample shows evidence of free water, the dielectric breakdown test should be waived, and the sample shall be reported as unsatisfactory. 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.

For severe problems resurfacing may be required. 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. Construct the electrodes of polished brass as disks Axtm residue from asfm buffing must be removed before the electrodes are reinstalled in the test cup. If this occurs, the cup should be warmed slightly to evaporate any 8.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Immediately after agitation, use a small portion of the sample to rinse the test cup. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

After adjustment of the gap spacing, the cup shall be rinsed with a dry solvent. Link to Active This link will always route to the current Active version of the standard.