IEC TR 60575:1977

Contents
Foreword
Preface
Introduction
Clause
1. Scope
2. Object
3. Thermal-mechanical performance test
4. Mechanical performance test
Appendix A:
A1. Background
A2. Insulator mechanics
A3. Notes on the thermal-mechanical performance test
A4. Notes on the mechanical performance test
A5. Survey of test results
Table I. Particulars relating to the cap and pin type
          string insulator units tested
Table II. Particulars relating to the long rod type
          string insulator units tested
Table III. Summary of test resultws for cap and pin type
           string insulator units CP 1 to CP 5
Table IV. Summary of test results for cap and pin type
          string insulator units CP 6 to CP 13
Table V. Summary of test results for cap and pin type
          string insulator units CP 14 to CP 21
Table VI. Summary of test results for long rod type
          string insulator units
Table VII. Number of failures observed below rated load
           valves for cap and pin type string insulator
           units
Table VII. Number of failures observed below rated load
           values for long rod type string insulator units
A.6 Criteria for judging test results
     Table IX. Index values Qs for cap and pin type string
               insulator units tested
     Table X. Index values Qs for long rod type string
               insulator units tested
A7. Conclusions

Applies to string insulator units of the cap and pin type as well as of the long rod type with insulating parts of ceramic material or glass intended for a.c. and d.c. overhead lines with a nominal voltage greater than 1000 V and also to insulators of similar design when used in substations. Note -This publication should be read in conjunction with IEC 60383.