oSIST prEN IEC 61558-2-14:2021
(Main)Safety of transformers, reactors, power supply units and combinations thereof - Part 2-14: Particular requirements and tests for variable transformers and power supply units incorporating variable transformers for general applications
Safety of transformers, reactors, power supply units and combinations thereof - Part 2-14: Particular requirements and tests for variable transformers and power supply units incorporating variable transformers for general applications
This part of IEC 61558 deals with the safety of variable transformers for general applications and power supply units incorporating variable transformers for general applications.
Variable transformers incorporating electronic circuits are also covered by this document.
NOTE 1 Safety includes electrical, thermal, mechanical and chemical aspects.
Unless otherwise specified, from here onward, the term transformer covers variable transformers for general applications and power supply units incorporating variable transformers for general applications.
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 variable dry-type transformers.
- variable auto-transformers;
- variable separating transformers;
- variable isolating transformers;
- variable safety isolating 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 operational frequencies do not exceed 500 Hz.
The rated output does not exceed:
- 40 kVA for single-phase variable auto-transformers;
- 200 kVA for poly-phase variable auto-transformers;
- 1 kVA for single-phase variable separating transformers;
- 5 kVA for poly-phase variable separating transformers;
- 25 kVA for single-phase variable isolating transformers;
- 40 kVA for poly-phase variable isolating transformers;
- 10 kVA for single-phase variable safety isolating transformers;
- 16 kVA for poly-phase variable safety isolating transformers.
This document is applicable to variable transformers without limitation of the rated 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.
[...]
Sicherheit von Transformatoren, Drosseln, Netzgeräten und deren Kombinationen - Teil 2-14: Besondere Anforderungen und Prüfungen für Stelltransformatoren und Netzgeräte, die Stelltransformatoren enthalten
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 2-14: Exigences particulières et essais pour les transformateurs variables et les blocs d'alimentation incorporant des transformateurs variables
IEC 61558-2-14:2022 est disponible sous forme de IEC 61558-2-14:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
- ajustement de la structure et des références conformément à l'IEC 61558-1:2017;
- description des constructions déplacées vers l'IEC 61558-1:2017;
- nouveaux symboles pour les blocs d'alimentation avec des tensions secondaires régulées linéairement et modifications de position du collecteur de courant exigées.
Il a le statut de publication groupée de sécurité conformément au Guide IEC 104.
Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-14. del: Posebne zahteve in preskusi za spremenljive transformatorje in napajalnike z vgrajenimi spremenljivimi transformatorji
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 61558-2-14:2021
01-julij-2021
Varnost transformatorjev, dušilk, napajalnikov in kombinacij teh elementov - 2-14.
del: Posebne zahteve in preskusi za spremenljive transformatorje in napajalnike z
vgrajenimi spremenljivimi transformatorji
Safety of transformers, reactors, power supply units and combinations thereof - Part 2-
14: Particular requirements and tests for variable transformers and power supply units
incorporating variable transformers for general applications
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments - Partie 2-14: Exigences particulières et essais pour les
transformateurs variables et les blocs d'alimentation incorporant des transformateurs
variables
Ta slovenski standard je istoveten z: prEN IEC 61558-2-14:2021
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN IEC 61558-2-14:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 61558-2-14:2021
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oSIST prEN IEC 61558-2-14:2021
96/507/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61558-2-14 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-04-30 2021-07-23
SUPERSEDES DOCUMENTS:
96/502/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 97,TC
Other TC/SCs are requested to indicate their interest, if
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 2-14:
Particular requirements and tests for variable transformers and power supply units
incorporating variable transformers for general applications
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 61558-2-14:2021
61558-2-14/Ed.2/CDV © IEC(E) 2 96/507/CDV
1 CONTENTS
2 FOREWORD. 3
3 INTRODUCTION . 5
4 1 Scope . 6
5 2 Normative references . 8
6 3 Terms and definitions . 8
7 4 General requirements . 9
8 5 General notes on tests . 9
9 6 Ratings . 9
10 7 Classification . 10
11 8 Marking and other information . 10
12 9 Protection against electric shock . 12
13 10 Change of input voltage setting . 13
14 11 Output voltage and output current under load . 13
15 12 No-load output voltage . 13
16 13 Short-circuit voltage . 15
17 14 Heating . 15
18 15 Short-circuit and overload protection . 16
19 16 Mechanical strength . 16
20 17 Protection against harmful ingress of dust, solid objects and moisture . 16
21 18 Insulation resistance, dielectric strength and leakage current . 16
22 19 Construction . 17
23 20 Components . 17
24 21 Internal wiring . 17
25 22 Supply connection and other external flexible cable or cords . 17
26 23 Terminals for external conductors . 17
27 24 Provisions for protective earthing . 17
28 25 Screws and connections . 17
29 26 Creepage distances, clearances and distances through insulation . 17
30 27 Resistance to heat, fire and tracking . 17
31 28 Resistance to rusting . 18
32 Annexes . 19
33 Bibliography . 20
34
35 Table 101 – Symbols indicating the kind of transformer . 11
36 Table 102 - – Output voltage ratio for auto-transformers, separating and safety
37 isolating transformers . 14
38 Table 103 – Output voltage ratio . 15
39 Table 104 - – Maximum permitted temperatures of the winding . 16
40
41
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oSIST prEN IEC 61558-2-14:2021
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42 INTERNATIONAL ELECTROTECHNICAL COMMISSION
43 ____________
44
45 SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS AND
46 COMBINATIONS THEREOF –
47
48 Part 2-14: Particular requirements and tests for variable transformers
49 and power supply units incorporating variable transformers
50 for general applications
51
52 FOREWORD
53 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
54 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
55 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
56 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
57 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
58 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
59 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
60 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
61 Standardization (ISO) in accordance with conditions determined by agreement 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 between
71 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
72 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
73 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
74 services carried out by independent certification bodies.
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, property 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 patent
84 rights. IEC shall not be held responsible for identifying any or all such patent rights.
85
86 International standard IEC 61558-2-14 has been prepared by IEC technical committee 96:
87 Transformers, reactors, power supply units and combinations thereof.
88 This second edition cancels and replaces the first edition published in 2012. This edition
89 constitutes a technical revision.
90 This edition includes the following significant technical changes with respect to the previous
91 edition:
92 a) Adjustment of structure and references in accordance with IEC 61558-1:2017;
93 b) Description of constructions moved to IEC 61558-1:2017;
94 c) New symbols for power supply units with linearly regulated output voltages and required
95 current collector position changes.
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oSIST prEN IEC 61558-2-14:2021
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96
97 The text of this International Standard is based on the following documents:
Draft Report on voting
96/XXX/FDIS 96/XXX/RVD
98
99 Full information on the voting for its approval can be found in the report on voting indicated in
100 the above table.
101 The language used for the development of this International Standard is English.
102 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
103 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
104 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
105 described in greater detail at www.iec.ch/standardsdev/publications.
106 It has the status of a group safety publication in accordance with IEC Guide 104.
107 This International Standard is to be used in conjunction with IEC 61558-1:2017.
108 NOTE When “Part 1” is mentioned in this standard, it refers to IEC 61558-1:2017.
109 This document supplements or modifies the corresponding clauses in IEC 61558-1:2017, so as
110 to convert that publication into the IEC standard: Particular requirements and tests for variable
111 transformers and power supply units incorporating variable transformers for general
112 applications.
113 A list of all parts in the IEC 61558 series published under the general title Safety of
114 transformers, reactors, power supply units and combinations thereof, can be found on the IEC
115 website.
116 Future standards in this series will carry the new general title as cited above. Titles of existing
117 standards in this series will be updated at the time of the next edition.
118 Where this document states "addition", "modification" or "replacement", the relevant text of
119 IEC 61558-1:2017 is to be adapted accordingly.
120 In this document, the following print types are used:
121 − requirements proper: in roman type;
122 − test specifications: in italic type;
123 − explanatory matter: in smaller roman type.
124 In the text of this document, the words in bold are defined in Clause 3.
125 Subclauses, notes, figures and tables additional to those in IEC 61558-1:2017 are numbered
126 starting from 101; supplementary annexes are entitled AA, BB, etc.
127 The committee has decided that the contents of this document will remain unchanged until the
128 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
129 the specific document. At this date, the document will be
130 • reconfirmed,
131 • withdrawn,
132 • replaced by a revised edition, or
133 • amended.
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134 INTRODUCTION
135 IEC/TC 96 has group safety function in accordance with IEC Guide 104 for transformers other
136 than those intended to supply distribution networks, in particular transformers and power supply
137 units intended to allow the application of protective measures against electric shock as defined
138 by TC 64, but in certain cases including limitation of voltage and horizontal safety function for
139 SELV in accordance with IEC 60364-4-41.
140 The group safety function (GSF) is necessary because of responsibility e.g. for safety extra-low
141 voltage (SELV) in accordance with IEC 61140:2016 5.2.6 and IEC 60364-4-41:2017 414.3.1 or
142 control circuits in accordance with IEC 60204-1: 2016, 7.2.4.
143 The group safety function is needed for each part of IEC 61558-2 because different standards
144 of the IEC 61558 series can be combined in one construction but in certain cases with no
145 limitation of rated output power.
146 For example an auto-transformer in accordance with IEC 61558-2-13 can be designed with a
147 separate SELV-circuit in accordance with the particular requirements for IEC 61558-2-6 relating
148 to the general requirements of IEC 61558-1.
149
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150 SAFETY OF TRANSFORMERS, REACTORS,
151 POWER SUPPLY UNITS AND COMBINATIONS THEREOF –
152
153 Part 2-14: Particular requirements and tests for variable transformers and
154 power supply units incorporating variable transformers
155 for general applications
156
157
158
159 1 Scope
160 Replacement
161 This part of IEC 61558 deals with the safety of variable transformers for general applications
162 and power supply units incorporating variable transformers for general applications.
163 Variable transformers incorporating electronic circuits are also covered by this document.
164 NOTE 1 Safety includes electrical, thermal, mechanical and chemical aspects.
165 Unless otherwise specified, from here onward, the term transformer covers variable
166 transformers for general applications and power supply units incorporating variable
167 transformers for general applications.
168 For power supply units (linear) this document is applicable. For switch mode power supply
169 units, IEC 61558-2-16 is applicable together with this document. Where two requirements are
170 in conflict, the most severe take precedence.
171 This document does not apply to transformers covered by IEC 60076-11.
172 This document is applicable to stationary or portable, single-phase or polyphase, air-cooled
173 (natural or forced) independent or associated variable dry-type transformers.
174 – variable auto-transformers;
175 – variable separating transformers;
176 – variable isolating transformers;
177 – variable safety isolating transformers.
178 The windings can be encapsulated or non-encapsulated.
179 The rated supply voltage does not exceed 1 000 V AC and the rated supply frequency and
180 the internal operational frequencies do not exceed 500 Hz.
181 The rated output does not exceed:
182 – 40 kVA for single-phase variable auto-transformers;
183 – 200 kVA for poly-phase variable auto-transformers;
184 – 1 kVA for single-phase variable separating transformers;
185 – 5 kVA for poly-phase variable separating transformers;
186 – 25 kVA for single-phase variable isolating transformers;
187 – 40 kVA for poly-phase variable isolating transformers;
188 – 10 kVA for single-phase variable safety isolating transformers;
189 – 16 kVA for poly-phase variable safety isolating transformers.
190 This document is applicable to variable transformers without limitation of the rated output
191 subject to an agreement between the purchaser and the manufacturer.
192 NOTE 2 Transformers intended to supply distribution networks are not included in the scope.
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193 For variable auto-transformers:
194 – the no-load output voltage or the rated output voltage does not exceed 1 000 V AC or
195 1 415 V ripple free DC;
196 – for independent variable auto-transformers the rated output voltage does exceed
197 50 V AC or 120 V ripple-free DC but not exceed 250 V AC.
198 NOTE 3 Normally variable auto-transformers are intended to be associated with the equipment to provide voltages
199 different from the supply voltage for the functional reasons. The protection against electric shock may be provided
200 or completed by other features of the equipment, such as the body.
201 NOTE 4 Variable auto-transformers intended to be used by technically skilled or trained personnel are considered
202 as associated variable transformers may have a rated output voltage less than 50 V AC.
203 For variable separating transformers:
204 – the no-load output voltage or the rated output voltage does not exceed 1 000 V AC or
205 1 415 V ripple free DC;
206 – for portable variable separating transformers the rated output voltage does exceed
207 50 V AC or 120 V ripple-free DC;
208 – are only used where double or reinforced insulation between circuits is not required by
209 the installation rules or by the end product standard.
210 NOTE 5 Normally variable separating transformers are intended to be associated with equipment to provide
211 voltages different from the supply voltage for the functional reasons. The protection against electric shock may be
212 provided or completed by other features of the equipment, such as the body. Parts of output circuits may be
213 connected to the protective earthing.
214 NOTE 6 Variable separating transformers intended to be used by technically skilled or trained personal are
215 considered as associated variable transformers and may have a rated output voltage less than 50 V AC or 120 V
216 ripple-free DC.
217 For variable isolating transformers:
218 – the no-load output voltage or the rated output voltage does not exceed 500 V AC or
219 708 V ripple free DC The no-load output voltage and the rated output voltage may be up
220 to 1 000 V AC or 1 415 V ripple free DC for special applications or in accordance with
221 national wiring rules;
222 – for independent variable isolating transformers the rated output voltage does not
223 exceed 250 V AC;.
224 – are used where double or reinforced insulation between circuits is required by the
225 installation rules or by the end product standard.
226 For variable safety isolating tr
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