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BS EN IEC 61462:2023

BS EN IEC 61462:2023

$198.66

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

Published By Publication Date Number of Pages
BSI 2023 56
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
13 2 Normative references
3 Terms and definitions
17 4 Relationships of mechanical loads
4.1 Loads from outside the insulator
4.2 Pressures
Tables
Table 1 ā€“ Mechanical loads applied to the insulator
Table 2 ā€“ Pressures applied to the insulator
18 5 Marking
6 Classification of tests
6.1 General
6.2 Design tests
19 Table 3 ā€“ Tests to be carried out after design changes
20 6.3 Type tests
6.4 Sample tests
6.5 Routine tests
21 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 ā€“ discharge dry power frequency test
7.2.4 Thermal-mechanical pre-stressing test
22 7.2.5 Water immersion pre-stressing test
7.2.6 Verification tests
23 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 ā€“ 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
24 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
25 8.3 Preparation of the test specimen
26 8.4 Internal pressure test
8.4.1 General
8.4.2 Test procedure
27 8.4.3 Acceptance criteria
8.5 Bending test
8.5.1 General
8.5.2 Test procedure
28 8.5.3 Acceptance criteria
9 Sample tests
9.1 Selection and number of insulators
Table 4 ā€“ Sample sizes
29 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
30 9.4.3 Acceptance criteria
9.5 Galvanizing test
9.6 Re-test procedure
Table 5 ā€“ Choice of re-test procedure
31 10 Routine tests
10.1 General
10.2 Visual examination
10.3 Routine mechanical test
10.4 Routine pressure test
32 10.5 Routine tightness test
11 Documentation
33 Figures
Figure 1 ā€“ Thermal-mechanical pre-stressing test ā€“ Typical cycles
34 Figure 2 ā€“ Thermal-mechanical pre-stressing test ā€“ Typical test arrangement
35 Figure 3 ā€“ Test arrangement for the leakage rate test
36 Figure 4 ā€“ Examples of sealing systems for composite hollow insulators
37 Annexes
Annex A (normative) Tolerances of form and position
Figure A.1 ā€“ Parallelism, coaxiality and concentricity
38 Figure A.2 ā€“ Angular deviation of fixing holes: Example 1
Figure A.3 ā€“ Angular deviation of fixing holes: Example 2
39 Figure A.4 ā€“ Tolerances according to standard drawing practice
40 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
41 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
42 Table B.1 ā€“ Loads/stress and classification of tests
43 Table B.2 ā€“ Example of pressure/bending values ā€“ Practical relationship of the values
44 Figure B.1 ā€“ Relationship of bending loads
Figure B.2 ā€“ Relationship of pressures
45 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
46 Figure C.1 ā€“ Position of strain gauges for pressure load and bending load
Figure C.2 ā€“ Strain/time curve, reversible elastic phase
47 Figure C.3 ā€“ Strain/time curve, irreversible plastic phase, damage limit
48 Annex D (informative) Principle sketch of hollow insulators design assembly
Figure D.1 ā€“ Interface description for insulator with housing made by modular assembly
49 Figure D.2 ā€“ Interface description for insulator with housing made by injection molding and overmolded end fitting
50 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
51 E.3 Internal pressure test
E.4 Bending test
Figure E.1 ā€“ Illustration of tapered insulators in bending
52 Figure E.2 ā€“ Illustration of axial membrane stress along the insulator when the length of the cylindrical parts is changed
53 E.5 References
54 Bibliography

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BS EN IEC 61462:2023
$198.66