IEC TS 60034-18-34:2000

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 General considerations
      3.1 Relationship to IEC 60034-18-1
      3.2 Thermomechanical ageing process
      3.3 Designation of test procedure
      3.4 Reference insulation system
4 Test specimens and test objects
      4.1 Construction
      4.2 Number of test specimens
5 Heating and cooling cycles
      5.1 Temperature and length of heating and cooling
             cycles
      5.2 Number of cycles
6 Test procedure 1 for bars/coils in model slots
      6.1 Model slot
      6.2 Support for end parts of test objects
      6.3 Methods of heating
      6.3 Methods of cooling
      6.5 Initial quality assurance and diagnostic tests
      6.6 Diagnostic tests during cycling
             6.6.1 Recommended frequency of diagnostic
                      tests
             6.6.2 Suggested diagnostic tests of
                      individual bars/coils
      6.7 Final diagnostic tests
7 Test procedure 2 for unrestrained bars/coils
      7.1 Positioning the bars/coils for test
      7.2 Method of heating
      7.3 Method of cooling
      7.4 Initial quality assurance and diagnostic tests
      7.5 Diagnostic tests during cycling
             7.5.1 Frequency of tests
             7.5.2 Type of suggested tests
      7.6 Final diagnostic tests
8 Analysing and reporting
Figure 1 - Details of test procedure
Figure 2 - Heating and cooling cycle schedule
Figure 3 - Example of the model slot with two bars

Deals with thermal cycling evaluation of insulation systems for form-wound windings. This kind of endurance is of special importance for long rotating machines ( especially indirectly cooled ) and machines that are exposed to a very large number of considerable load changes during normal operation.