IEC 60034-18-32 pdf download Rotating electrical machines – Part 18-32: Functional evaluation of insulation systems – Test procedures for form-wound windings – Evaluation by electrical endurance
This part of IEC 60034-1 8 describes test procedures for the evaluation of electrical endurance of insulation systems for use in a.c. or d.c. rotating electrical machines using form-wound windings. The test procedures are comparative in nature, such that the performance of a candidate insulation system is compared to that of a reference insulation system with proven service experience. The test procedures are principally directed at the insulation systems in air-cooled machines but may also be used for evaluating parts of the insulation systems in hydrogen cooled machines. Note that the qualification procedures of inverter duty insulation systems for form-wound windings can be found in IEC 60034-1 8-42.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60034-1 , Rotating electrical machines – Part 1: Rating and performance
IEC 60034-1 5:2009, Rotating electrical machines – Part 15: Impulse voltage withstand levels of form-wound stator coils for rotating a.c. machines
IEC 60034-1 8-1 :201 0, Rotating electrical machines – Part 18-1: Functional evaluation of insulation systems – General guidelines
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
main electrical insulation that separates the conductors from the earthed stator/rotor core in motor and generator windings
electrical insulation that covers each conductor in coils/bars
electrical insulation that separates the conductor turns from each other in coils/bars
corona protection material
material which is used to coat a stator coil/bar within the slot portion of the stator core to avoid slot discharges
stress grading material
material generally having a non-linear resistivity characteristic, applied to the endwindings of stators to reduce the maximum surface electrical stress
4 General considerations
4.1 Relationship to Part 1 of IEC 60034-1 8
The principles of Part 1 of IEC 60034-1 8 should be followed unless the recommendations of this International Standard indicate otherwise.
4.2 Selection and designation of test procedures
One or more of the procedures in this International Standard should be suitable for the majority of evaluations. Evaluation is usually performed by the manufacturer of the machine/coils or by a third party laboratory. It is the manufacturer’s responsibility to justify the most suitable procedure in Table 1 on the basis of past experience and knowledge of the insulation systems to be compared.
The test procedure should be selected from Table 1 and designated by IEC 60034-1 8-32 procedure N, where N is the designation given in the Table 1 . Subclauses 4.3, 4.4 and 4.5 give guidance on how to select the test procedure.