oSIST prEN IEC 61558-2-20:2022

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-20: Particular requirements and tests for small reactors

Sicherheit von Transformatoren, Drosseln, Netzgeräten und entsprechende Kombinationen - Teil 2-20: Besondere Anforderungen und Prüfungen an Kleindrosseln

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 2-20: Règles particulières et essais pour les petites bobines d'inductance

Varnost transformatorjev, dušilk, napajalnikov in podobnih izdelkov - 2-20. del: Posebne zahteve in preskusi za majhne dušilke

General Information

• Status: Not Published
• Public Enquiry End Date: 20-Apr-2022
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: I96 - Imaginarni 96
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 07-Feb-2022
• Due Date: 27-Jun-2022
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: prEN IEC 61558-2-20:2022 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-20: Particular requirements and tests for small reactors

RELATIONS

• Revised: SIST EN 61558-2-20:2011 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-20: Particular requirements and tests for small reactors (IEC 61558-2-20:2010)
• Effective Date: 21-Sep-2021

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN IEC 61558-2-20:2022
01-april-2022
Varnost transformatorjev, dušilk, napajalnikov in podobnih izdelkov - 2-20. del:
Posebne zahteve in preskusi za majhne dušilke

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-

20: Particular requirements and tests for small reactors
Sicherheit von Transformatoren, Drosseln, Netzgeräten und entsprechende

Kombinationen - Teil 2-20: Besondere Anforderungen und Prüfungen an Kleindrosseln

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des

combinaisons de ces éléments - Partie 2-20: Règles particulières et essais pour les

petites bobines d'inductance
Ta slovenski standard je istoveten z: prEN IEC 61558-2-20:2022
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN IEC 61558-2-20:2022 en

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

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oSIST prEN IEC 61558-2-20:2022
96/530/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61558-2-20 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-01-28 2022-04-22
SUPERSEDES DOCUMENTS:
96/525/RR
IEC TC 96 : TRANSFORMERS, REACTORS, POWER SUPPLY UNITS, AND COMBINATIONS THEREOF
SECRETARIAT: SECRETARY:
Germany Mr Wolfgang Reichelt
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
SC 3C,TC 14,TC 22,SC 22E,SC 34C,TC 51,TC
55,TC 61,SC 62A,TC 64,TC 66,TC 77,TC 85,TC
Other TC/SCs are requested to indicate their interest, if
97,TC 106,TC 108,TC 109,TC 111,TC 112
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

Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

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.
TITLE:

Safety of transformers, reactors, power supply units and combinations thereof - Part 2-20:

Particular requirements and tests for small reactors
PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:

Copyright © 2021 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, or any part of it,

for any other purpose without permission in writing from IEC.
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1 CONTENTS

3 FOREWORD ........................................................................................................................... 3

4 INTRODUCTION ..................................................................................................................... 5

5 1 Scope .............................................................................................................................. 6

6 2 Normative references ...................................................................................................... 7

7 3 Terms and definitions ...................................................................................................... 7

8 4 General requirements ...................................................................................................... 9

9 5 General notes on tests .................................................................................................... 9

10 6 Ratings ............................................................................................................................ 9

11 7 Classification ................................................................................................................. 10

12 8 Marking and other information ....................................................................................... 10

13 9 Protection against electric shock ................................................................................... 13

14 10 Change of input voltage setting ..................................................................................... 13

15 10 Change of voltage setting .............................................................................................. 13

16 11 Output voltage and output current under load ................................................................ 13

17 11 Voltage drop .................................................................................................................. 13

18 12 No-load output voltage .................................................................................................. 13

19 13 Short-circuit voltage....................................................................................................... 14

20 14 Heating .......................................................................................................................... 14

21 15 Short-circuit and overload protection ............................................................................. 14

22 16 Mechanical strength ...................................................................................................... 16

23 17 Protection against harmful ingress of dust, solid objects and moisture ........................... 16

24 18 Insulation resistance, dielectric strength and leakage current ........................................ 16

25 19 Construction .................................................................................................................. 16

26 20 Components .................................................................................................................. 16

27 21 Internal wiring ................................................................................................................ 17

28 22 Supply connection and other external flexible cable or cords ......................................... 17

29 23 Terminals for external conductors .................................................................................. 17

30 24 Provisions for protective earthing .................................................................................. 17

31 25 Screws and connections ................................................................................................ 17

32 26 Creepage distances, clearances and distances through insulation ................................. 17

33 27 Resistance to heat, fire and tracking .............................................................................. 17

34 28 Resistance to rusting ..................................................................................................... 18

35 Annexes ............................................................................................................................... 19

36 Annex AA (informative) Characteristic parameter measurements ........................................ 19

37 Bibliography .......................................................................................................................... 20

39 Table 101 – Symbols indicating the kind of transformer ........................................................ 12

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42 INTERNATIONAL ELECTROTECHNICAL COMMISSION
43 ____________
45 SAFETY OF TRANSFORMERS, REACTORS,
46 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
48 Part 2-20: Particular requirements and tests for small reactors
51 FOREWORD

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

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

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

55 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

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

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

58 may participate in this preparatory work. International, governmental and non-governmental organizations liaising

59 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

60 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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

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

63 interested IEC National Committees.

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

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

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

67 misinterpretation by any end user.

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

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

70 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

71 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

72 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

73 services carried out by independent certification bodies.

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

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

76 members of its technical committees and IEC National Committees for any personal injury, property damage or

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

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

79 Publications.

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

81 indispensable for the correct application of this publication.

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

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

84 International standard IEC 61558-2-20 has been prepared by IEC technical committee 96:

85 Transformers, reactors, power supply units and combinations thereof.

86 This third edition cancels and replaces the second edition published in 2010. This edition

87 constitutes a technical revision.

88 This edition includes the following significant technical changes with respect to the previous

89 edition:
90 a) Adjustment of structure and references in accordance with IEC 61558-1:2017

91 b) Additional Annex AA with references for characteristic parameter measurements

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94 The text of this International Standard is based on the following documents:
Draft Report on voting
96/XXX/FDIS 96/XXX/RVD

96 Full information on the voting for its approval can be found in the report on voting indicated in

97 the above table.

98 The language used for the development of this International Standard is English.

99 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

100 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

101 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

102 described in greater detail at www.iec.ch/standardsdev/publications.

103 It has the status of a group safety publication in accordance with IEC Guide 104.

104 This International Standard is to be used in conjunction with IEC 61558-1:2017.

105 NOTE When “Part 1” is mentioned in this standard, it refers to IEC 61558-1:2017.

106 This document supplements or modifies the corresponding clauses in IEC 61558-1:2017, so as

107 to convert that publication into the IEC standard: Particular requirements and tests for small

108 reactors.

109 A list of all parts in the IEC 61558 series published under the general title Safety of transformers,

110 reactors, power supply units and combinations thereof, can be found on the IEC website.

111 Future standards in this series will carry the new general title as cited above. Titles of existing

112 standards in this series will be updated at the time of the next edition.

113 Where this document states "addition", "modification" or "replacement", the relevant text of

114 IEC 61558-1:2017 is to be adopted accordingly.
115 In this document, the following print types are used:
116 – requirements proper: in roman type;
117 – test specifications: in italic type;
118 – explanatory matter: in smaller roman type.
119 In the text of this document, the words in bold are defined in Clause 3.

120 Subclauses, notes, figures and tables additional to those in IEC 61558-1:2017 are numbered

121 starting from 101; supplementary annexes are entitled AA, BB, etc.

122 The committee has decided that the contents of this document will remain unchanged until the

123 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

124 the specific document. At this date, the document will be
125  reconfirmed,
126  withdrawn,
127  replaced by a revised edition, or
128  amended.
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129 INTRODUCTION

130 IEC TC 96 has a group safety function in accordance with IEC Guide 104 for transformers other

131 than those intended to supply distribution networks, in particular transformers and power supply

132 units intended to allow the application of protective measures against electric shock as defined

133 by TC 64, but in certain cases including the limitation of voltage and horizontal safety function

134 for SELV, in accordance with IEC 60364-4-41.

135 The group safety function (GSF) is necessary because of responsibility for safety extra-low

136 voltage (SELV) in accordance with IEC 61140:2016, 5.2.6 and IEC 60364-4-41:2017, 414.3.1

137 or control circuits in accordance with IEC 60204-1:2016, 7.2.4.

138 The group safety function is needed for each part of IEC 61558-2 because different standards

139 of the IEC 61558 series can be combined in one construction but in certain cases with no

140 limitation of rated output power.

141 For example an auto-transformer in accordance with IEC 61558-2-13 can be designed with a

142 separate SELV-circuit in accordance with the particular requirements for IEC 61558-2-6 relating

143 to the general requirements of IEC 61558-1.
144
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145 SAFETY OF TRANSFORMERS, REACTORS,
146 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
147
148 Part 2-20: Particular requirements and tests for small reactors
149
150
151 1 Scope
152 Replacement

153 This part of IEC 61558 deals with the safety of small reactors for general applications. Small

154 reactors incorporating electronic circuits are also covered by this document.

155 NOTE 1 Safety includes electrical, thermal and mechanical aspects.

156 Unless otherwise specified, from here onward, the term transformer or reactor covers small

157 reactors.

158 This document is applicable to stationary or portable, single-phase or polyphase, air-cooled

159 (natural or forced) general purpose reactors including alternating current, premagnetised and

160 current compensated independent or associated dry-type reactors. The windings can be

161 encapsulated or non-encapsulated.

162 The rated supply voltage does not exceed 1 000 V AC or 1 500 V ripple-free DC, the rated

163 supply frequency and the internal operating frequencies do not exceed 100 MHz.

164 The rated power does not exceed:
165  25 kVAR AC (25 kW DC) for single-phase reactors,
166  50 kVAR AC (50 kW DC) for poly-phase reactors.

167 This document is applicable to reactors without limitation of the rated power subject to an

168 agreement between the purchaser and the manufacturer.
169 This document does not apply to:
170  reactors covered by IEC 60076-6;
171  ballast for tubular fluorescent covered by IEC 61347-2-8;

172  ballast for discharge lamps (excluding tubular fluorescent lamps) covered by

173 IEC 61347-2-9.

174 NOTE 2 For reactors filled with liquid dielectric or pulverised material such as sand, additional requirements are

175 under consideration.

176 NOTE 3 Normally, reactors are intended to be associated with equipment for functional requirements of the

177 equipment or requirements by the installation rules or by other appliance specifications. The protection against

178 electric shock may be provided or completed by other parts or features of the equipment, such as the body.

179 NOTE 4 Reactors for particular applications will in the future be covered by complementary normative annexes.

180 Attention is drawn to the following if necessary:

181  for reactors intended to be used in vehicles, on board ships, and aircraft, additional

182 requirements (from other applicable standards, national rules, etc.);

183  measures to protect the enclosure and the components inside the enclosure against

184 external influences such as fungus, vermin, termites, solar-radiation, and icing;

185  the different conditions for transportation, storage, and operation of the reactors;

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186  additional requirements in accordance with other appropriate standards and national

187 rules may be applicable to reactors intended for use in special environments.

188 Future technological development of reactors may necessitate a need to increase the upper

189 limit of the frequencies. Until then this document may be used as a guidance document.

190 This GROUP SAFETY PUBLICATION focusing on SAFETY guidance is primarily intended to

191 be used as a PRODUCT SAFETY STANDARD for the products mentioned in the scope, but is

192 also intended to be used by TCs in the preparation of publications for products similar to those

193 mentioned in the scope of this GROUP SAFETY PUBLICATION, in accordance with the

194 principles laid down in IEC Guide 104 and lSO/lEC Guide 51.

195 One of the RESPONSIBILITIES of a TC is, wherever applicable, to make use of BSPs and/or

196 GSPs in the preparation of its publications.
197
198 2 Normative references
199 This clause of Part 1 is applicable, except as follows:
200 Addition

201 IEC 61558-1:2017, Safety of transformers, reactors, power supply units and combinations

202 thereof – Part 1: General requirements and tests

203 IEC 61558-2-16:2021, Safety of transformers, reactors, power supply units and combinations

204 thereof – Part 1: Particular requirements and tests for switch mode power supply units and

205 transformers for switch mode power supply units for general applications
206
207 3 Terms and definitions

208 For the purposes of this document, the terms and definitions given in Part 1 apply.

209 ISO and IEC maintain terminological databases for use in standardization at the following

210 addresses:
211  IEC Electropedia: available at http://www.electropedia.org/
212  ISO Online browsing platform: available at http://www.iso.org/obp
213 Modification

214 Where Part 1 is applicable, the word "transformer", if used, shall be replaced by "reactor".

215
216 3.1 Transformers
217 Addition
218 3.1.101
219 alternating current reactor

220 reactor in which the magnetising current generates an alternating magnetic field, changing its

221 polarity depending on the frequency
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222 3.1.102
223 premagnetised reactor

224 reactor in which the magnetising direct current generates a magnetic field of only one polarity,

225 while a superimposed alternating current alters the direct magnetic field depending on its

226 strength and the frequency
227 3.1.103
228 current compensated reactor

229 reactor with at least two windings on a common core, where the magnetising currents are in

230 opposite directions in order to reduce the magnetic flux
231 Replacement
232 3.1.9
233 overload proof reactor

234 reactor in which the temperature does not exceed the specified limits when the reactor is

235 overloaded and continues to meet all requirements of this standard after the removal of the

236 overload
237 3.1.9.1
...