kSIST prEN IEC 61558-2-2:2022

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

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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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 . 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
35
36 Table 101 – Symbols indicating the kind of transformer . 10
37
38

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39 INTERNATIONAL ELECTROTECHNICAL COMMISSION
40 ____________
41
42 SAFETY OF TRANSFORMERS, REACTORS,
43 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
44
45 Part 2-2: Particular requirements and tests for control transformers and
46 power supply units incorporating control transformers
47
48
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.
91
92

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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
94
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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