kSIST FprEN 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

IEC 61558-2-20:2022 is available as IEC 61558-2-20:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61558-2-20:2022 deals with the safety of small reactors for general applications. Small reactors incorporating electronic circuits are also covered by this document. This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- adjustment of structure and references in accordance with IEC 61558-1:2017.
- additional Annex AA with references for characteristic parameter measurements.
- additional Annex BB for associated reactors with frequencies above 500 Hz.
- additional Annex CC for partial discharge.
It has the status of a group safety publication in accordance with IEC Guide 104.

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

IEC 61558-2-20:2022 est disponible sous forme de IEC 61558-2-20:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

L'IEC 61558-2-20:2022 traite de la sécurité des petites bobines d'inductance pour applications d'ordre général. Les petites bobines d'inductance qui incorporent des circuits électroniques sont également couvertes par le présent document. Cette troisième édition annule et remplace la deuxième édition parue en 2010. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- la structure et les références ont été alignées sur l'IEC 61558-1:2017;
- l'Annexe AA a été ajoutée et contient des références pour les mesurages des paramètres caractéristiques;
- l'Annexe BB a été ajoutée pour les bobines d'inductance associées dont les fréquences sont supérieures à 500 Hz;
- l'Annexe CC a été ajoutée pour l'essai de décharge partielle.
Il a le statut de publication groupée de sécurité conformément au l'IEC Guide 104.

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: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 11-Oct-2022
• Due Date: 29-Nov-2022
• Completion Date: 08-Dec-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: FprEN 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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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
2
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
38
39 Table 101 – Symbols indicating the kind of transformer . 12
40
41

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42 INTERNATIONAL ELECTROTECHNICAL COMMISSION
43 ____________
44
45 SAFETY OF TRANSFORMERS, REACTORS,
46 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
47
48 Part 2-20: Particular requirements and tests for small reactors
49
50
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
92
93

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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
95
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
...