IEC 60034-27-3-2015 pdf download.Rotating electrical machines – Part 27-3: Dielectric dissipation factor measurement on stator winding insulation of rotating electrical machines.
This part of IEC 60034 provides guidelines for the test procedures and the interpretation of test results for dielectric dissipation factor measurements on the stator winding insulation of rotating electrical machines. These guidelines are valid for rotating electrical machines with conductive slot coatings operating at a rated voltage of 6 kV and higher.
This standard applies to individual form-wound stator bars and coils outside a core (uninstalled), individual stator bars and coils installed in a core and complete form-wound stator winding of machines in new or aged condition.
This International Standard applies to all kind of vacuum impregnated or resin-rich (fullyloaded) taped bars, coils and complete windings. It is not applicable to non-impregnated individual bars and coils or non-impregnated complete windings.
Requirements for the dielectric dissipation factor characteristics of individual form-wound stator bars and coils of machines with rating voltages from 6 kV and higher when tested with 50 Hz or 60 Hz alternating voltages are given.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amend- ments) applies.
IEC 60060-1 , High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60060-2, High-voltage test techniques – Part 2: Measuring systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 rated voltage
U N voltage or voltage range between lines at the terminals (also called line-to-line voltage) as- signed, generally by a manufacturer, for a specified operating condition of a machine
3.2 dielectric dissipation factor
tan δ tangent of the dielectric loss angle δ (complement of the insulation power factor angle) at pre- determined values of temperature, frequency, and voltage or dielectric stress
Note 1 to entry: Other terms sometimes used for this property are tan delta, loss tangent, dielectric loss factor or dielectric power factor. Between the dielectric dissipation factor and the power factor (the cosine of power factor ngle or the sine of the dielectric loss angle) a physical difference exists, but the two measurements are very near- ly the same, when the dielectric dissipation factor is lower than 1 00 × 1 0 –3 (see 4.1 ).
Note 2 to entry: Although the dielectric dissipation factor tan δ is expressed in absolute value in this standard, it is also expressed in percentage in other documents.IEC 60034-27-3 pdf download.