IEC 62772:2023

IEC 62772 ®
Edition 2.0 2023-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Composite hollow core station post insulators for substations with a.c. voltage
greater than 1 000 V and d.c. voltage greater than 1 500 V – Definitions, test
methods and acceptance criteria

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IEC 62772 ®
Edition 2.0 2023-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Composite hollow core station post insulators for substations with a.c. voltage
greater than 1 000 V and d.c. voltage greater than 1 500 V – Definitions, test
methods and acceptance criteria
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.080.10  ISBN 978-2-8322-7899-4
– 2 – IEC 62772:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Identification and marking . 13
5 Environmental conditions . 13
6 Information on transport, storage and installation . 13
7 Classification of tests. 14
7.1 General . 14
7.2 Design tests . 14
7.3 Type tests . 17
7.4 Sample tests . 18
7.5 Routine tests. 18
8 Design tests . 18
8.1 General . 18
8.2 Tests on interfaces and connections of end fittings . 18
8.2.1 General . 18
8.2.2 Test specimens . 19
8.2.3 Reference disruptive- discharge dry power frequency voltage test . 19
8.2.4 Thermal mechanical pre-stressing test . 19
8.2.5 Water immersion pre-stressing test . 19
8.2.6 Verification tests . 19
8.3 Assembled core load tests . 20
8.3.1 Test for the verification of the maximum design cantilever load (MDCL) . 20
8.3.2 Test for the verification of the maximum design torsion load (MDToL) . 20
8.3.3 Verification of the specified tension load (STL) . 21
8.4 Tests on shed and housing material . 22
8.4.1 General Hardness test . 22
8.4.2 Accelerated weathering test . 22
8.4.3 Tracking and erosion test – 1 000 h salt fog AC voltage test . 22
8.4.4 Flammability test . 22
8.4.5 Hydrophobicity transfer test . 22
8.5 Tests on the tube material . 22
8.5.1 General . 22
8.5.2 Porosity test (Dye penetration test) . 22
8.5.3 Water diffusion test . 22
8.6 Water diffusion test on core with housing . 22
9 Type tests . 23
9.1 Internal pressure test . 23
9.2 Bending test . 23
9.3 Specified tension load test, compression and buckling withstand load test . 23
9.4 Electrical tests . 23
9.4.1 General . 23
9.4.2 Mounting arrangements for electrical tests . 23
9.4.3 Dry lightning impulse withstand voltage test. 23

9.4.4 Dry or wet switching impulse withstand voltage test . 24
9.4.5 Dry power-frequency withstand voltage test . 24
9.4.6 Wet power-frequency withstand voltage test . 24
9.5 Wet switching impulse withstand voltage .
10 Sample tests . 24
11 Routine tests . 24
11.1 General . 24
11.2 Routine seal leak rate test . 24
11.2.1 General . 24
11.2.2 Test procedure . 24
11.2.3 Acceptance criteria . 25
12 Documentation . 25
Annexe A (informative) Water diffusion test Qualification of fillers . 26
A.1 General . 26
A.2 Dye penetration test with solid filler . 26
A.3 Water diffusion test with solid filler . 26
A.4 Tests on interfaces and connections of end fittings with filler . 26
Annexe B (informative) Load definitions, relationship of loads . 28
Annexe C (informative) Principle sketch of hollow insulators design assembly . 31
Bibliography . 33

Figure A.1 – Example of sample preparation for water diffusion test . 27
Figure B.1 – Definitions according to IEC 62231 . 28
Figure B.2 – Definitions according to IEC 61462 . 29
Figure B.3 – Comparison of definitions IEC 61462 vs. IEC 62231 . 30
Figure C.1 – Interface description for insulator with housing made by modular
assembly . 31
Figure C.2 – Interface description for insulator with housing made by injection
moulding and ouvermold end fitting . 32

Table 1 – Required design and type tests . 15

– 4 – IEC 62772:2023 RLV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMPOSITE HOLLOW CORE STATION POST
INSULATORS FOR SUBSTATIONS
WITH AC VOLTAGE GREATER THAN
1 000 V AND DC VOLTAGE GREATER THAN 1 500 V –
DEFINITIONS, TEST METHODS AND ACCEPTANCE CRITERIA

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