prEN IEC 62896:2023

Hybrid insulators for a.c. and d.c. for high-voltage applications greater than 1000V AC and 1500 V DC - Definitions, test methods and acceptance criteria

Hybridisolatoren für Wechsel- und Gleichspannungsanwendungen für Spannungen größer 1000 V AC und 1500 V DC – Definitionen, Prüfmethoden und Annahmebedingungen

Hibridni izolatorji za izmenične in enosmerne visokonapetostne aplikacije za izmenične napetosti nad 1000 V in enosmerne napetosti nad 1500 V - Definicije, preskusne metode, merila sprejemljivost

General Information

• Status: Not Published
• Publication Date: 19-Nov-2024
• ICS: 29.080.10 - Insulators
• Technical Committee: CLC/SR 36 - Insulators for substations
• Drafting Committee: IEC/TC 36 - IEC_TC_36
• Current Stage: 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
• Start Date: 21-Apr-2023
• Completion Date: 21-Apr-2023
• Ref Project: oSIST prEN IEC 62896:2023 - Hybrid insulators for a.c. and d.c. for high-voltage applications greater than 1000V AC and 1500 V DC - Definitions, test methods and acceptance criteria

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN IEC 62896:2023
01-april-2023
Hibridni izolatorji za izmenične in enosmerne visokonapetostne aplikacije za
izmenične napetosti nad 1000 V in enosmerne napetosti nad 1500 V - Definicije,
preskusne metode, merila sprejemljivost

Hybrid insulators for a.c. and d.c. for high-voltage applications greater than 1000V AC

and 1500 V DC - Definitions, test methods and acceptance criteria
Ta slovenski standard je istoveten z: prEN IEC 62896:2023
ICS:
29.080.10 Izolatorji Insulators
oSIST prEN IEC 62896:2023 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 62896:2023
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oSIST prEN IEC 62896:2023
36/554/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62896 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-01-27 2023-04-21
SUPERSEDES DOCUMENTS:
36/539/CD, 36/551A/CC
IEC TC 36 : INSULATORS
SECRETARIAT: SECRETARY:
Sweden Mr Dan Windmar
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

This document is still under study and subject to change. It should not be used for reference purposes.

Recipients of this document are invited to submit, with their comments, notification of

• any relevant patent rights of which they are aware and to provide supporting documentation,

• any relevant “in some countries” clauses to be included should this proposal proceed. Recipients are

reminded that the enquiry stage is the final stage for submitting "in some countries" clauses. See

AC/22/2007.
TITLE:

Hybrid insulators for a.c. and d.c. for high-voltage applications greater than 1000V AC and 1500

V DC - Definitions, test methods and acceptance criteria
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:

Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to

download this electronic file, to make a copy and to print out the content for the sole purpose of preparing

National Committee positions. You may not copy or "mirror" the file or printed version of the document, o r any

part of it, for any other purpose without permission in writing from IEC.
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oSIST prEN IEC 62896:2023
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1 CONTENTS

2 FOREWORD ......................................................................................................................... 3

3 INTRODUCTION ................................................................................................................... 5

4 1 Scope ............................................................................................................................ 6

5 2 Normative references..................................................................................................... 6

6 3 Definitions ..................................................................................................................... 7

7 4 Identification ................................................................................................................ 10

8 5 Environmental conditions ............................................................................................. 10

9 6 Tolerances .................................................................................................................. 10

10 7 Classification of tests ................................................................................................... 10

11 7.1 Design tests ........................................................................................................ 10

12 7.2 Type tests ........................................................................................................... 11

13 7.3 Sample tests ....................................................................................................... 11

14 7.4 Routine tests ....................................................................................................... 11

15 8 Design tests ................................................................................................................ 13

16 8.1 General ............................................................................................................... 13

17 8.2 Tests on interfaces and connections of end fittings .............................................. 14

18 8.2.1 General ....................................................................................................... 14

19 8.2.2 Pre-stressing ............................................................................................... 14

20 8.2.3 Verification tests .......................................................................................... 15

21 8.3 Tests on Shed and Housing Material ................................................................... 15

22 8.3.1 Hardness test .............................................................................................. 15

23 8.3.2 Accelerated weathering test ......................................................................... 15

24 8.3.3 Tracking and erosion test ............................................................................. 15

25 8.3.4 Flammability test .......................................................................................... 15

26 8.3.5 Hydrophobicity transfer test .......................................................................... 15

27 9 Type tests ................................................................................................................... 16

28 9.1 General ............................................................................................................... 16

29 9.2 Electrical tests .................................................................................................... 16

30 9.3 Mechanical tests ................................................................................................. 16

31 10 Sample tests ............................................................................................................... 16

32 11 Routine tests ............................................................................................................... 16

33 Bibliography ....................................................................................................................... 18

35 Figure 1 – Thermal cycle test .............................................................................................. 14

37 Table 1 – Required tests ..................................................................................................... 12

38 Table 2 – Design tests ........................................................................................................ 13

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42 INTERNATIONAL ELECTROTECHNICAL COMMISSION
43 ____________
45 HYBRID INSULATORS FOR AC AND DC HIGH-VOLTAGE APPLICATIONS
46 GREATER THAN 1000 V AC and 1500 V DC – DEFINITIONS, TEST
47 METHODS
48 AND ACCEPTANCE CRITERIA
51 FOREWORD

52 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization compris ing

53 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

54 international co-operation on all questions concerning standardization in the electrical and electronic fields. To

55 this end and in addition to other activities, IEC publishes International Standards, Documents, Technical

56 Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”).

57 Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject

58 dealt with may participate in this preparatory work. International, governmental and non-governmental

59 organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the

60 International Organization for Standardization (ISO) in accordance with conditions determined by agreement

61 between the two organizations.

62 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

63 consensus of opinion on the relevant subjects since each technical committee has representation from all

64 interested IEC National Committees.

65 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

66 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

67 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

68 misinterpretation by any end user.

69 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

70 transparently to the maximum extent possible in their national and regional publications. Any divergence

71 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

72 the latter.

73 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

74 equipment declared to be in conformity with an IEC Publication.

75 6) All users should ensure that they have the latest edition of this publication.

76 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

77 members of its technical committees and IEC National Committees for any personal injury, proper ty damage or

78 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

79 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

80 Publications.

81 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

82 indispensable for the correct application of this publication.

83 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

84 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

85 This new edition cancels and replaces the technical specification and the document is

86 transferred into international standard as per result of inquiry.
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89 The text of this standard is based on the following documents:
CDV Report on voting
To be completed To be completed

91 Full information on the voting for the approval of this standard can be found in the report on

92 voting indicated in the above table.

93 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

94 The committee has decided that the contents of this publication will remain unchanged until

95 the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in

96 the data related to the specific publication. At this date, the publication will be

97 • reconfirmed,
98 • withdrawn,
99 • replaced by a revised edition, or
100 • amended.
101
102
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103 INTRODUCTION

104 Hybrid insulators consist of an insulating core, bearing the mechanical load protected by a

105 polymeric housing, the load being transmitted to the core by end fittings. Despite these

106 common features, the materials used and the construction details employed by different

107 manufacturers may be quite different. The core is made of ceramic or glass material.

108 Hybrid insulators are applied as overhead line, post or hollow core equipment insulators. In

109 order to perform the design tests, IEC 62217 shall be applied for the polymeric housing and

110 the interfaces between core and the housing. For the core, the test standards for the

111 respective ceramic product (IEC 60168, IEC 60383-1/-2 and IEC 62155) shall be applied.

112 Some tests have been grouped together as "design tests", to be performed only once on

113 insulators which satisfy the same design conditions. For all design tests of hybrid insulators,

114 the common clauses defined in IEC 62217 are applied. As far as practical, the influence of

115 time on the electrical and mechanical properties of the components (core material, housing,

116 interfaces etc.) and of the complete hybrid insulators has been considered in specifying the

117 design tests to ensure a satisfactory life-time under normally known stress conditions in

118 service.

119 Polymeric housing materials that show the hydrophobicity transfer mechanism (HTM) are

120 preferred for hybrid insulators. They are applied as a countermeasure against severe polluted

121 service conditions.

122 Pollution tests according to IEC 60507 or IEC 61245 are not included in this standard since

123 they are designed for non-polymeric items. Specific pollution tests for polymeric insulators are

124 still under consideration.
125
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126 HYBRID INSULATORS FOR AC AND DC HIGH-VOLTAGE APPLICATIONS
127 GREATER THAN 1000 V AC, and 1500 V DC – DEFINITIONS, TEST
128 METHODS
129 AND ACCEPTANCE CRITERIA
130
131
132
133 1 Scope

134 This document applies to hybrid insulators for AC and DC applications greater than 1000 V

135 AC and 1500 V DC consisting of a load-bearing insulating solid or hollow core consisting of

136 ceramic or glass, a housing (defined geometry, outside the insulating core) made of polymeric

137 material and end fittings permanently attached to the insulating core.

138 Hybrid insulators covered by this document are intended for use as suspension/tension long

139 rod and cap and pin type insulators, line post insulators, station post insulators and hollow

140 core insulators for apparatus.
141 The object of this document is to:
142 • define the terms used;
143 • prescribe test methods;
144 • prescribe acceptance criteria.

145 Silicone or other functional coatings (CIGRE Technical Brochure No. 478), booster sheds,

146 shed extenders and rain deflectors are not within the scope of this document. CIGRE B2.69

147 published two Technical Brochures, TB 837 and TB 838, in June 2021 with the scope of

148 practical applications and collection of experiences for anti-pollution coatings for insulators

149 This document does not include requirements dealing with the choice of insulators for specific

150 operating conditions.
151 2 Normative references

152 The following documents, in whole or in part, are normatively referenced in this document and

153 are indispensable for its application. For dated references, only the edition cited applies. For

154 undated references, the latest edition of the referenced document (including any

155 amendments) applies.

156 IEC 60050-471, International Electrotechnical Vocabulary – Part 471: Insulators

157 IEC 60168, Tests on indoor and outdoor post insulators of ceramic material or glass for

158 systems with nominal voltages greater than 1000 V

159 IEC 60383-1, Insulators for overhead lines with a nominal voltage above 1000 V – Part 1:

160 Ceramic or glass insulator units for a.c. systems – Definitions, test methods and acceptance

161 criteria

162 IEC 60383-2, Insulators for overhead lines with a nominal voltage above 1000 V – Part 2:

163 Insulator strings and insulator sets for a.c. systems – Definitions, test methods and

164 acceptance criteria

165 IEC 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in

166 electrical equipment with rated voltages greater than 1 000 V
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167 IEC 62217, Polymeric HV insulators for indoor and outdoor use – General definitions, test

168 methods and acceptance criteria

169 IEC 61211, Insulators of ceramic material or glass for overhead lines with a nominal voltage

170 greater than 1 000 V – Impulse puncture testing in air

171 IEC 61325, Insulators for overhead lines with a nominal voltage above 1000 V - Ceramic or

172 glass insulator units for d.c. systems - Definitions, test methods and acceptance criteria

173 3 Definitions

174 For the purpose of this document the terms and definitions given in IEC 60050-471 and the

175 following apply (some definitions from IEC 62217 are reproduced here for ease of reference).

176 3.1
177 High-voltage
178 HV
179 voltage over 1 000 V AC or over 1 500 V DC or over 1 500 V peak value
180 3.2
181 polymeric insulator

182 insulator whose insulating body consists of at least one organic based material

183 Note 1 to entry: Polymeric insulators are also known as non-ceramic insulators.

184 Note 2 to entry: Coupling devices may be attached to the ends of the insulating body.

185 [SOURCE: IEC 60050-471, 471-01-13]
186 3.3
187 resin insulator

188 polymeric insulator whose insulating body consists of a solid insulator trunk and sheds

189 protruding from the insulator trunk made from only one organic based housing material (e.g.

190 cycloaliphatic epoxy)
191
192 3.4
193 composite insulator

194 polymeric insulator made of at least two polymeric insulating parts, namely a core and a

195 housing, equipped with metal fittings

196 Note 1 to entry: Composite insulators, for example, can consist either of individual sheds mounted on the core,

197 with or without an intermediate sheath, or alternatively, of a housing directly moulded or cast in one or several

198 pieces on to the core.
199 [SOURCE: IEC 60050-471, 471-01-02]
200 3.5
201 hybrid insulator

202 insulator that consists of a ceramic core and a polymeric housing, equipped with one or more

203 metal fittings
204 Note 1 to entry: According to IEC TS 62896.

205 Note 2 to entry: The mechanical functions are mainly characterised by the core, the external electrical functions are mainly

206 characterised by the polymeric housing. The housing may cover the core completely or partly. In the latter case the exposed

207 portions of the ceramic core are usually covered by glaze.
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Polymeric insulator Ceramic / glass insulator
Housing Core
Resin Composite
Hybrid insulator
insulator insulator
IEC
208
209
210 3.6
211 core

212 central insulating part of an insulator which provides the mechanical characteristics

213 Note 1 to entry: The housing and sheds are not part of the core.
214 [SOURCE: IEC 60050-471, 471-01-11]
215 3.7
216 insulator trunk
217 central insulating part of an insulator from which the sheds project
218 Note 1 to entry: Also known as shank on smaller insulators.
219 [SOURCE: IEC 60050-471, 471-01-11]
220 3.8
221 housing

222 external insulating part of a composite insulator providing the necessary creepage distance and

223 protecting core from environment

224 Note 1 to entry: An intermediate sheath made of insulating material may be part of the housing.

225 [SOURCE: IEC 60050-471, 471-01-09]
226 3.9
227 shed (of an insulator)

228 insulating part, projecting from the insulator trunk, intended to increase the creepage distance

229 Note 1 to entry: The shed can be with or without ribs.
230 [SOURCE: IEC 60050-471, 471-01-15]
231 3.10
232 creepage distance

233 shortest distance or the sum of the shortest distances along the surface on an insulator between

234 two conductive parts which normally have the operating voltage between them
235 [SOURCE: IEC 60050-471, 471-01-04]
236 3.11
237 arcing distance

238 shortest distance in air external to the insulator between the metallic parts which normally have

239 the operating voltage between them
240 [SOURCE: IEC 60050-471, 471-01-01]
241 3.12
242 sheath
243 uniform and continuous tubular covering made of insulating material
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244 [SOURCE: IEC 60050-151, 151-12-41]
245 3.13
246 Interfaces
247 surface between the different materials

248 Note 1 to entry: Various interfaces can be found in most composite insulators, e.g.:

249 - between housing and fixing devices;

250 - between various parts of the housing; e.g. between sheds, or between sheath and sheds;

251 - between core and housing.
252 3.14
253 end fitting fixing device

254 integral component or formed part of an insulator, intended to connect it to a supporting

255 structure, or to a conductor, or to an item of equipment, or to another insulator

256 Note 1 to entry: Where the end fitting is metallic, the term “metal fitting” is normally used.

257 [SOURCE: IEC 60050-471, 471-01-06, modified by the addition of a synonym]
258 3.15
259 connection zone

260 zone where the mechanical load is transmitted between the insulating body and the fixing

261 device
262 3.16
263 coupling

264 part of the fixing device which transmits load to the hardware external to the insulator

265 3.17
266 tracking

267 progressive degradation of the surface of a solid insulating material by local discharges to form

268 conducting or partially conducting paths (see IEC 60060-212-01-42)
269 Note 1 to entry: Tracking paths are conductive even under dry conditions..
270 3.18
271 erosion
272 Loss of material due to leakage current or electrical discharge.

273 Note 1 to entry: Light surface traces, commonly tree-shaped, can occur on composite insulators as on ceramic

274 insulators, after
...