IEC 61109:2008

FOREWORD
INTRODUCTION
1 Scope and object
2 Normative references
3 Terms, definitions and abbreviations
   3.1 Terms and definitions
   3.2 Abbreviations
4 Identification
5 Environmental conditions
6 Transport, storage and installation
7 Hybrid insulators
8 Tolerances
9 Classification of tests
   9.1 Design tests
   9.2 Type tests
   9.3 Sample tests
   9.4 Routine tests
10 Design tests
   10.1 General
   10.2 Test specimens for IEC 62217
        10.2.1 Tests on interfaces and connections of end
               fittings
        10.2.2 Tracking and erosion test
        10.2.3 Tests on core material
   10.3 Product specific pre-stressing for IEC 62217
        10.3.1 Sudden load release
        10.3.2 Thermal-mechanical pre-stress
   10.4 Assembled core load-time tests
        10.4.1 Test specimens
        10.4.2 Mechanical load test
11 Type tests
   11.1 Electrical tests
   11.2 Damage limit proof test and test of the
        tightness of the interface between end
        fittings and insulator housing
        11.2.1 Test specimens
        11.2.2 Performance of the test
        11.2.3 Evaluation of the test
12 Sample tests
   12.1 General rules
   12.2 Verification of dimensions (E1 + E2)
   12.3 Verification of the end fittings (E2)
   12.4 Verification of tightness of the interface
        between end fittings and insulator housing
        (E2) and of the specified mechanical load,
        SML (E1)
   12.5 Galvanizing test (E2)
   12.6 Re-testing procedure
13 Routine tests
   13.1 Mechanical routine test
   13.2 Visual examination
Annex A (informative) Principles of the damage limit,
        load coordination and testing for composite
        suspension and tension insulators
Annex B (informative) Example of two possible devices
        for sudden release of load
Annex C (informative) Guidance on non-standard mechanical
        stresses and dynamic mechanical loading of
        composite tension/suspension insulators
Bibliography

IEC 61109:2008 applies to composite suspension/tension insulators consisting of a load-bearing cylindrical insulating solid core consisting of fibres - usually glass - in a resin-based matrix, a housing (outside the insulating core) made of polymeric material and end fittings permanently attached to the insulating core. The main technical changes with respect to the previous edition are
- removal of tests procedures now given in IEC 62217;
- inclusion of clauses on tolerances, environmental conditions, transport, storage and installation;
- general improvement of the description of tests and addition of a new Annex C on non-standard loads.