IEC 62772:2023

Composite hollow core station post insulators with a.c. voltage greater than 1 000 V and d.c. voltage greater than 1 500 V - Definitions, test methods and acceptance criteria

IEC 62772:2023 applies to composite hollow core station post insulators consisting of a load-bearing insulating tube (core) made of resin impregnated fibres, insulating filler material (solid, liquid, gaseous – pressurized or unpressurized), a housing (outside the insulating tube) made of polymeric material (for example silicone or ethylene-propylene) and fixing devices at the ends of the insulating tube. Composite hollow core station post insulators as defined in this standard are intended for general use in substations in both, outdoor and indoor environments, operating with a rated AC voltage greater than 1 000 V and a frequency not greater than 100 Hz or for use in direct current systems with a rated voltage greater than 1 500 V DC. The object of this document is:
- to define the terms used;
- to specify test methods;
- to specify acceptance criteria.

Isolateurs supports composites creux présentant une tension alternative supérieure à 1 000 V et une tension continue supérieure à 1 500 V - Définitions, méthodes d'essai et critères d'acceptation

L'IEC 62772:2023 s’applique aux isolateurs supports composites creux qui sont constitués d’un tube (noyau) isolant en fibres imprégnées de résine supportant la charge mécanique, d’un matériau de charge interne (solide, liquide, gaz, sous pression ou pas), d’un revêtement en polymère à l’extérieur du tube isolant (par exemple silicone ou éthylène-propylène) et de dispositifs de fixation à ses extrémités. Les isolateurs supports composites creux, tels que définis dans la présente norme, sont destinés à l’utilisation générale dans les postes, tant en extérieur qu’en intérieur. Ils fonctionnent avec une tension alternative assignée de plus de 1 000 V en courant alternatif et à une fréquence maximale de 100 Hz, ou sont utilisés dans les systèmes à courant continu avec une tension assignée supérieure à 1 500 V en courant continu. Le présent document a pour objet:
- de définir les termes utilisés;
- de spécifier des méthodes d’essai;
- de spécifier les critères d’acceptation.

General Information

• Status: Published
• Publication Date: 14-Nov-2023
• ICS: 29.080.10 - Insulators
• Technical Committee: TC 36 - Insulators
• Drafting Committee: MT 24 - TC 36/MT 24
• Current Stage: PPUB - Publication issued
• Start Date: 22-Sep-2023
• Completion Date: 15-Nov-2023

Relations

• Revises: IEC 62772:2016 - 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
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Secretariat Tel.: [phone]
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About the IEC
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International Standards for all electrical, electronic and related technologies.

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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

FOREWORD
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...

IEC 62772 ®
Edition 2.0 2023-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Composite hollow core station post insulators with a.c. voltage greater than
1 000 V and d.c. voltage greater than 1 500 V – Definitions, test methods and
acceptance criteria
Isolateurs supports composites creux présentant une tension alternative
supérieure à 1 000 V et une tension continue supérieure à 1 500 V – Définitions,
méthodes d'essai et critères d'acceptation

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
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IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
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If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: [e-mail].
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IEC 62772 ®
Edition 2.0 2023-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Composite hollow core station post insulators with a.c. voltage greater than

1 000 V and d.c. voltage greater than 1 500 V – Definitions, test methods and

acceptance criteria
Isolateurs supports composites creux présentant une tension alternative

supérieure à 1 000 V et une tension continue supérieure à 1 500 V – Définitions,

méthodes d'essai et critères d'acceptation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.10  ISBN 978-2-8322-7404-0

– 2 – IEC 62772:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Identification and marking . 12
5 Environmental conditions . 13
6 Information on transport, storage and installation . 13
7 Classification of tests. 13
7.1 General . 13
7.2 Design tests . 13
7.3 Type tests . 15
7.4 Sample tests . 16
7.5 Routine tests. 16
8 Design tests . 16
8.1 General . 16
8.2 Tests on interfaces and connections of end fittings . 16
8.2.1 General . 16
8.2.2 Test specimens . 17
8.2.3 Reference disruptive- discharge dry power frequency voltage test . 17
8.2.4 Thermal mechanical pre-stressing test . 17
8.2.5 Water immersion pre-stressing test . 17
8.2.6 Verification tests . 17
8.3 Assembled core load tests . 17
8.3.1 Test for the verification of the maximum design cantilever load (MDCL) . 17
8.3.2 Test for the verification of the maximum design torsion load (MDToL) . 18
8.3.3 Verification of the specified tension load (STL) . 19
8.4 Tests on shed and housing material . 19
8.4.1 Hardness test . 19
8.4.2 Accelerated weathering test . 20
8.4.3 Tracking and erosion – 1 000 h salt fog AC voltage test . 20
8.4.4 Flammability test . 20
8.4.5 Hydrophobicity transfer test . 20
8.5 Tests on the tube material . 20
8.5.1 General . 20
8.5.2 Porosity test (Dye penetration test) . 20
8.5.3 Water diffusion test . 20
8.6 Water diffusion test on core with housing . 20
9 Type tests . 20
9.1 Internal pressure test . 20
9.2 Bending test . 20
9.3 Specified tension load test, compression and buckling withstand load test . 20
9.4 Electrical tests . 21
9.4.1 General . 21
9.4.2 Mounting arrangements for electrical tests . 21
9.4.3 Dry lightning impulse withstand voltage test. 21

9.4.4 Dry or wet switching impulse withstand voltage test . 21
9.4.5 Dry power-frequency withstand voltage test . 21
9.4.6 Wet power-frequency withstand voltage test . 21
10 Sample tests . 21
11 Routine tests . 22
11.1 General . 22
11.2 Routine seal leak rate test . 22
11.2.1 General . 22
11.2.2 Test procedure . 22
11.2.3 Acceptance criteria . 22
12 Documentation . 23
Annex A (informative) Qualification of fillers . 24
A.1 General . 24
A.2 Dye penetration test with solid filler . 24
A.3 Water diffusion test with solid filler . 24
A.4 Tests on interfaces and connections of end fittings with filler . 24
Annex B (informative) Load definitions, relationship of loads . 26
Annex C (informative) Principle sketch of hollow insulators design assembly . 29
Bibliography . 31

Figure A.1 – Example of sample preparation for water diffusion test . 25
Figure B.1 – Definitions according to IEC 62231 . 26
Figure B.2 – Definitions according to IEC 61462 . 27
Figure B.3 – Comparison of definitions IEC 61462 vs. IEC 62231 . 28
Figure C.1 – Interface description for insulator with housing made by modular
assembly .
...