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

This part of IEC 61558 deals with the safety of control transformers and power supply units incorporating control transformers. Transformers incorporating electronic circuits are also covered by this document.
NOTE 1 Safety includes electrical, thermal and mechanical aspects.
Unless otherwise specified, from here onward, the term transformer covers control transformers and power supply units incorporating control transformers.
For power supply units (linear) this document is applicable. For switch mode power supply units IEC 61558-2-16 is applicable together with this document. Where two requirements are in conflict, the most severe take precedence.
This document does not apply to transformers covered by IEC 60076-11.
This document is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated dry- type transformers. The windings can be encapsulated or non-encapsulated.
The rated supply voltage does not exceed 1 000 V AC and the rated supply frequency and the internal operating frequencies do not exceed 500 Hz.
The rated thermal output does not exceed:
- 25 kVA for single-phase transformers,
- 40 kVA for polyphase transformers;
This document is applicable to transformers without limitation of the rated thermal output, subject to an agreement between the purchaser and the manufacturer.
NOTE 2 Transformers intended to supply distribution networks are not included in the scope.
The no-load output voltage or the rated output voltage does not exceed 1 000 V AC or 1 415 V ripple-free DC. For independent transformers the no-load output voltage and / or the rated output voltage is not less than 50 V AC or 120 V ripple-free DC.
This document is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers.
NOTE 3 Transformers covered by this document are only used in applications where double or reinforced insulation between circuits is not required by the installation rules or by the end product standard.
NOTE 4 Normally the control transformers are intended to be used with equipment to provide voltages different from the supply voltage for the functional requirements of the equipment. The protection against electric shock may be provided or completed by other features of the equipment, such as the body. Parts of output circuits may be connected to the input circuits or to protective earthing.
Attention is drawn to the following:
- for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc.);
- measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing;
- the different conditions for transportation, storage, and operation of the transformers;
- additional requirements in accordance with other appropriate standards and national rules may be applicable to transformers intended for use in special environments.
Future technological development of transformers may necessitate a need to increase the upper limit of the frequencies. Until then this document may be used as a guidance document.
This GROUP SAFETY PUBLICATION focusing on SAFETY guidance is primarily intended to be used as a PRODUCT SAFETY STANDARD for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products similar to those mentioned in the scope of this GROUP SAFETY PUBLICATION, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
One of the RESPONSIBILITIES of a TC is, wherever applicable, to make use of BSPs and/or GSPs in the preparation of its publications.

Sicherheit von Transformatoren, Drosseln, Netzgeräten und entsprechenden Kombinationen – Teil 2-2: Besondere Anforderungen und Prüfungen für Steuertransformatoren und Netzgeräten, die Steuertransformatoren enthalten

Sécurité des transformateurs, alimentations, bobines d'inductance et produits analogues - Partie 2-2: Règles particulières et essais pour les transformateurs de commande et les alimentations incorporant les transformateurs de commande

IEC 61558-2-2:2022 est disponible sous forme de IEC 61558-2-2:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 61558-2-2:2022 traite de la sécurité des transformateurs de commande et des blocs d'alimentation qui incorporent des transformateurs de commande. Les transformateurs qui incorporent des circuits électroniques sont également couverts par le présent document. Cette troisième édition annule et remplace la deuxième édition parue en 2007. 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;
- un nouveau symbole général a été ajouté pour les transformateurs de commande;
- un nouveau symbole a été ajouté pour les blocs d'alimentation dont la régulation de la tension secondaire est linéaire.
Il a le statut de publication groupée de sécurité conformément au Guide 104 de l'IEC.

Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-2. del: Posebne zahteve in preskusi za kontrolne transformatorje in napajalnike s kontrolnimi transformatorji

General Information

Status
Not Published
Public Enquiry End Date
29-Nov-2021
Technical Committee
Current Stage
5020 - Formal vote (FV) (Adopted Project)
Start Date
17-Aug-2022
Due Date
05-Oct-2022
Completion Date
25-Nov-2022

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SLOVENSKI STANDARD
oSIST prEN IEC 61558-2-2:2021
01-november-2021

Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-2.

del: Posebne zahteve in preskusi za kontrolne transformatorje in napajalnike s
kontrolnimi transformatorji

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

Particular requirements and tests for control transformers and power supply units

incorporating control transformers

Sécurité des transformateurs, alimentations, bobines d'inductance et produits analogues

- Partie 2-2: Règles particulières et essais pour les transformateurs de commande et les

alimentations incorporant les transformateurs de commande
Ta slovenski standard je istoveten z: prEN IEC 61558-2-2:2021
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN IEC 61558-2-2:2021 en

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

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oSIST prEN IEC 61558-2-2:2021
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oSIST prEN IEC 61558-2-2:2021
96/522/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61558-2-2 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-10-01 2021-12-24
SUPERSEDES DOCUMENTS:
96/519/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 2-2:

Particular requirements and tests for control transformers and power supply units

incorporating control transformers
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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oSIST prEN IEC 61558-2-2:2021
61558-2-2/Ed.3/CDV © IEC(E) 2 96/522/CDV
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 .................................................................................................... 8

9 5 General notes on tests ................................................................................................... 8

10 6 Ratings .......................................................................................................................... 8

11 7 Classification ................................................................................................................. 9

12 8 Marking and other information ........................................................................................ 9

13 9 Protection against electric shock .................................................................................. 10

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

15 11 Output voltage and output current under load ............................................................... 10

16 12 No-load output voltage ................................................................................................. 11

17 13 Short-circuit voltage ..................................................................................................... 12

18 14 Heating ....................................................................................................................... 12

19 15 Short-circuit and overload protection ............................................................................ 12

20 16 Mechanical strength ..................................................................................................... 12

21 17 Protection against harmful ingress of dust, solid objects and moisture .......................... 12

22 18 Insulation resistance, dielectric strength and leakage current ........................................ 12

23 19 Construction ................................................................................................................ 12

24 20 Components ................................................................................................................ 13

25 21 Internal wiring .............................................................................................................. 14

26 22 Supply connection and other external flexible cable or cords ........................................ 14

27 23 Terminals for external conductors ................................................................................ 14

28 24 Provisions for protective earthing ................................................................................. 14

29 25 Screws and connections .............................................................................................. 14

30 26 Creepage distances, clearances and distances through insulation ................................ 14

31 27 Resistance to heat, fire and tracking ............................................................................ 14

32 28 Resistance to rusting ................................................................................................... 14

33 Annexes ............................................................................................................................. 15

34 Bibliography ....................................................................................................................... 16

36 Table 101 – Symbols indicating the kind of transformer ....................................................... 10

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39 INTERNATIONAL ELECTROTECHNICAL COMMISSION
40 ____________
42 SAFETY OF TRANSFORMERS, REACTORS,
43 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
45 Part 2-2: Particular requirements and tests for control transformers and
46 power supply units incorporating control transformers
49 FOREWORD

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

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

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

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

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

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

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

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

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

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

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

61 interested IEC National Committees.

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

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

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

65 misinterpretation by any end user.

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

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

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

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

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

71 services carried out by independent certification bodies.

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

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

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

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

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

77 Publications.

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

79 indispensable for the correct application of this publication.

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

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

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

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

84 This third edition cancels and replaces the second edition published in 2007. This edition

85 constitutes a technical revision.

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

87 edition:

88 a) Adjustment of structure and references in accordance with IEC 61558-1:2017;

89 b) New general symbol for control transformers
90 c) New symbol for power supply unit with linearly regulated output voltage.
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93 The text of this International Standard is based on the following documents:
Draft Report on voting
96/XXX/FDIS 96/XXX/RVD

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

96 the above table.

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

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

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

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

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

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

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

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

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

106 to convert that publication into the IEC standard: Particular requirements and tests for control

107 transformers and power supply units incorporating control transformers.

108 A list of all parts in the IEC 61558 series published under the general title Safety of

109 transformers, reactors, power supply units and combinations thereof, can be found on the IEC

110 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.
129
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130 INTRODUCTION

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

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

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

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

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

136 The group safety function (GSF) is necessary because of responsibility for example for safety

137 extra-low voltage (SELV) in accordance with IEC 61140:2016, 5.2.6 and IEC 60364-4-41:2005,

138 414.3.1 or control circuits in accordance with IEC 60204-1:2016, 7.2.4.

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

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

141 limitation of rated output power.

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

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

144 to the general requirements of IEC 61558-1.
145
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146 SAFETY OF TRANSFORMERS, REACTORS,
147 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
148
149 Part 2-2: Particular requirements and tests for control transformers and
150 power supply units incorporating control transformers
151
152
153 1 Scope
154 Replacement

155 This part of IEC 61558 deals with the safety of control transformers and power supply units

156 incorporating control transformers. Transformers incorporating electronic circuits are also

157 covered by this document.
158 NOTE 1 Safety includes electrical, thermal and mechanical aspects.

159 Unless otherwise specified, from here onward, the term transformer covers control

160 transformers and power supply units incorporating control transformers.

161 For power supply units (linear) this document is applicable. For switch mode power supply

162 units IEC 61558-2-16 is applicable together with this document. Where two requirements are

163 in conflict, the most severe take precedence.
164 This document does not apply to transformers covered by IEC 60076-11.

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

166 (natural or forced) independent or associated dry- type transformers. The windings can be

167 encapsulated or non-encapsulated.

168 The rated supply voltage does not exceed 1 000 V AC and the rated supply frequency and

169 the internal operating frequencies do not exceed 500 Hz.
170 The rated thermal output does not exceed:
171 − 25 kVA for single-phase transformers,
172 − 40 kVA for polyphase transformers;

173 This document is applicable to transformers without limitation of the rated thermal output,

174 subject to an agreement between the purchaser and the manufacturer.

175 NOTE 2 Transformers intended to supply distribution networks are not included in the scope.

176 The no-load output voltage or the rated output voltage does not exceed 1 000 V AC or

177 1
...

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