This International Standard applies to composite hollow insulators consisting of a load-bearing insulating tube made of resin impregnated fibres, a housing (outside the insulating tube) made of elastomeric material (for example silicone or ethylene-propylene) and metal fixing devices at the ends of the insulating tube. Composite hollow insulators as defined in this standard are intended for general use (unpressurized) or for use with a permanent gas pressure (pressurized). They are intended for use in both outdoor and indoor electrical equipment operating on alternating current with a rated voltage greater than 1 000 V a.c. and a frequency not greater than 100 Hz or for use in direct current equipment with a rated voltage greater than 1 500 V d.c. The object of this standard is: – to define the terms used; – to prescribe test methods; – to prescribe acceptance criteria. Hollow insulators are integrated into electrical equipment which is electrically type tested as required by the applicable equipment standard. So, it is not the object of this standard to prescribe dielectric type tests because the withstand voltages and flashover behaviour are not characteristics of the hollow insulator itself but of the apparatus of which it ultimately forms a part. All the tests in this standard, apart from the thermal-mechanical test, are performed at normal ambient temperature. This standard does not prescribe tests that may be characteristic of the apparatus of which the hollow insulator ultimately forms a part. Composite hollow insulators are intended for use in electrical equipment, such as, but not limited to: – HV circuit-breakers, – switch-disconnectors, – disconnectors, – station posts, – disconnecting circuit breakers, – earthing switches, – instrument- and power transformers, – bushings, – cable terminations. Additional testing defined by the relevant IEC equipment standard may be required.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 Scope <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 4 Relationships of mechanical loads 4.1 Loads from outside the insulator 4.2 Pressures Tables Table 1 \u2013 Mechanical loads applied to the insulator Table 2 \u2013 Pressures applied to the insulator <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5 Marking 6 Classification of tests 6.1 General 6.2 Design tests <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Table 3 \u2013 Tests to be carried out after design changes <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6.3 Type tests 6.4 Sample tests 6.5 Routine tests <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7 Design tests 7.1 General 7.2 Tests on interfaces and connections of end fittings 7.2.1 General 7.2.2 Test specimen 7.2.3 Reference disruptive \u2013 discharge dry power frequency test 7.2.4 Thermal-mechanical pre-stressing test <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 7.2.5 Water immersion pre-stressing test 7.2.6 Verification tests <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 7.3 Tests on shed and housing material 7.3.1 Hardness test 7.3.2 Accelerated weathering test 7.3.3 Tracking and erosion test \u2013 1000 h salt fog AC voltage test 7.3.4 Flammability test 7.3.5 Hydrophobicity transfer test 7.4 Tests on the tube material 7.4.1 General <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 7.4.2 Porosity test (Dye penetration test) 7.4.3 Water diffusion test 7.5 Water diffusion test on core with housing 8 Type tests (only mechanical tests) 8.1 General 8.2 Test specimens <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 8.3 Preparation of the test specimen <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 8.4 Internal pressure test 8.4.1 General 8.4.2 Test procedure <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 8.4.3 Acceptance criteria 8.5 Bending test 8.5.1 General 8.5.2 Test procedure <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 8.5.3 Acceptance criteria 9 Sample tests 9.1 Selection and number of insulators Table 4 \u2013 Sample sizes <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 9.2 Testing 9.3 Verification of dimensions 9.3.1 Test procedure 9.3.2 Acceptance criteria 9.4 Mechanical tests 9.4.1 General 9.4.2 Test procedure <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 9.4.3 Acceptance criteria 9.5 Galvanizing test 9.6 Re-test procedure Table 5 \u2013 Choice of re-test procedure <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 10 Routine tests 10.1 General 10.2 Visual examination 10.3 Routine mechanical test 10.4 Routine pressure test <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 10.5 Routine tightness test 11 Documentation <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Figures Figure 1 \u2013 Thermal-mechanical pre-stressing test \u2013 Typical cycles <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure 2 \u2013 Thermal-mechanical pre-stressing test \u2013 Typical test arrangement <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Figure 3 \u2013 Test arrangement for the leakage rate test <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Figure 4 \u2013 Examples of sealing systems for composite hollow insulators <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Annexes Annex A (normative) Tolerances of form and position Figure A.1 \u2013 Parallelism, coaxiality and concentricity <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure A.2 \u2013 Angular deviation of fixing holes: Example 1 Figure A.3 \u2013 Angular deviation of fixing holes: Example 2 <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Figure A.4 \u2013 Tolerances according to standard drawing practice <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Annex B (informative) General recommendations for design and construction B.1 Guidance for design B.2 Guidance for the maximum service pressure B.3 Guidance on sample testing of tube material <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | B.4 Guidance for the temperature required by the equipment manufacturer B.5 Guidance for the mechanical loads required by the equipment manufacturer B.6 Summary of the tests <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Table B.1 \u2013 Loads\/stress and classification of tests <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Table B.2 \u2013 Example of pressure\/bending values \u2013 Practical relationship of the values <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Figure B.1 \u2013 Relationship of bending loads Figure B.2 \u2013 Relationship of pressures <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Annex C (informative) Principles of damage limit and use of reversible and irreversibles train caused by internal pressure and\/or bending loads on composite hollow insulator tubes C.1 Overview C.2 Definition C.3 Example of determining the strain tolerance <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Figure C.1 \u2013 Position of strain gauges for pressure load and bending load Figure C.2 \u2013 Strain\/time curve, reversible elastic phase <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Figure C.3 \u2013 Strain\/time curve, irreversible plastic phase, damage limit <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Annex D (informative) Principle sketch of hollow insulators design assembly Figure D.1 \u2013 Interface description for insulator with housing made by modular assembly <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Figure D.2 \u2013 Interface description for insulator with housing made by injection molding and overmolded end fitting <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Annex E (informative) Type tests on tapered (conical) insulators E.1 General E.2 Minimum length on the most stressed cylindrical parts on shortened test specimens <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | E.3 Internal pressure test E.4 Bending test Figure E.1 \u2013 Illustration of tapered insulators in bending <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | Figure E.2 \u2013 Illustration of axial membrane stress along the insulator when the length of the cylindrical parts is changed <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | E.5 References <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Composite hollow insulators. Pressurized and unpressurized insulators for use in electrical equipment with AC rated voltage greater than 1 000 V AC and D.C. voltage greater than 1500V. Definitions, test methods, acceptance criteria and design recommendations<\/b><\/p>\n |