tailieunhanh - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens

This test method covers a means of testing the surface insulation resistivity of single strips or punchings of flat-rolled electrical steel under predetermined conditions of voltage, pressure, and temperature. | Designation A717 A717M 12 Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens1 This standard is issued under the fixed designation A717 A717M the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. 1. Scope 4. Summary of Test Method This test method covers a means of testing the surface Ten metallic contacts of fixed area are applied to one of insulation resistivity of single strips or punchings of flat-rolled the surfaces of the specimen and electrical contact is made with electrical steel under predetermined conditions of voltage the base metal by two drills. The effectiveness of the surface pressure and temperature. insulation is then indicated by a measurement of average electrical current flowing between the contacts and the base The values stated in either SI units or inch-pound units metal under specified applied voltage. This measurement can are to be regarded separately as standard. The values stated in be used directly as an indicator of insulation quality or may be each system may not be exact equivalents therefore each converted to an apparent surface insulation resistivity value. system shall be used independently of the other. Combining values from the two systems may result in non-conformance 5. Significance and Use with the standard. This test method is particularly suitable for quality This standard does not purport to address all of the control in the application of insulating coatings. safety concerns if any associated with its use. It is the responsibility of the user of this standard to establish appro- Surface insulation resistivity is evaluated from a dc priate safety and health practices and determine the applica- current that can range from 0 perfect .