SIST EN 61558-2-26:2014

SLOVENSKI STANDARD
SIST EN 61558-2-26:2014
01-februar-2014
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Safety of transformers, reactors, power supply units and combinations thereof - Part 2-
26: Particular requirements and tests for transformers and power supply units for saving
energy and other purposes
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments - Partie 2-26: Exigences particulières et essais pour les
transformateurs et les blocs d’alimentation destinés à l’économie d’énergie et à d’autres
fins
Ta slovenski standard je istoveten z: EN 61558-2-26:2013
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 61558-2-26:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61558-2-26:2014

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SIST EN 61558-2-26:2014

EUROPEAN STANDARD
EN 61558-2-26

NORME EUROPÉENNE
September 2013
EUROPÄISCHE NORM

ICS 29.180


English version


Safety of transformers, reactors, power supply units and combinations
thereof -
Part 2-26: Particular requirements and tests for transformers and power
supply units for saving energy and other purposes
(IEC 61558-2-26:2013)


Sécurité des transformateurs, bobines Sicherheit von Transformatoren, Drosseln,
d’inductance, blocs d’alimentation et des Netzgeräten und deren Kombinationen -
combinaisons de ces éléments - Teil 2-26: Besondere Anforderungen und
Partie 2-26: Règles particulières et essais Prüfungen für Transformatoren und
pour les transformateurs et les blocs Netzgeräte zur Energieeinsparung sowie
d’alimentation entièrement destinés à für andere Zwecke
l’économie d’énergie et à d’autres fins (IEC 61558-2-26:2013)
(CEI 61558-2-26:2013)




This European Standard was approved by CENELEC on 2013-08-14. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61558-2-26:2013 E

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SIST EN 61558-2-26:2014
EN 61558-2-26:2013 - 2 -

Foreword
The text of document 96/400/FDIS, future edition 1 of IEC 61558-2-26, prepared by IEC TC 96
"Transformers, reactors, power supply units and combinations thereof" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN 61558-2-26:2013.
The following dates are fixed:
(dop) 2014-05-14
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-08-14
standards conflicting with the

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed
for Use within Certain Voltage Limits (LVD - 2006/95/EC).

Endorsement notice
The text of the International Standard IEC 61558-2-26:2013 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60076 series NOTE  Harmonised in EN 60079 series.
IEC 61558-2-1 NOTE  Harmonised as EN 61558-2-1.
IEC 61558-2-4 NOTE  Harmonised as EN 61558-2-4.
IEC 61558-2-6 NOTE  Harmonised as EN 61558-2-6.

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SIST EN 61558-2-26:2014
- 3 - EN 61558-2-26:2013
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Addition to the Annex ZA of EN 61558-1:2005:

Publication Year Title EN/HD Year

IEC 61558-1 2005 Safety of power transformers, power supplies, EN 61558-1 2005
+ corr. March 2008 reactors and similar products - + corr. August 2006
+ corr. March 2010 Part 1: General requirements and tests
+ corr. April 2011


IEC 61558-2-13 - Safety of transformers, reactors, power supply EN 61558-2-13 -
units and similar products for supply voltages
up to 1 100 V -
Part 2-13: Particular requirements and tests
for auto transformers and power supply units
incorporating auto transformers


IEC 61558-2-14 - Safety of transformers, reactors, power supply EN 61558-2-14 -
units and combinations thereof -
Part 2-14: Particular requirements and test for
variable transformers and power supply units
incorporating variable transformers


IEC 61558-2-16 - Safety of transformers, reactors, power supply EN 61558-2-16 -
units and similar products for voltages up to
1 100 V -
Part 2-16: Particular requirements and tests
for switch mode power supply units and
transformers for switch mode power supply
units

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SIST EN 61558-2-26:2014

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SIST EN 61558-2-26:2014



IEC 61558-2-26

®


Edition 1.0 2013-07




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Safety of transformers, reactors, power supply units and combinations thereof –

Part 2-26: Particular requirements and tests for transformers and power supply

units all for saving energy and other purposes




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

combinaisons de ces éléments –


Partie 2-26: Règles particulières et essais pour les transformateurs et les blocs

d’alimentation entièrement destinés à l’économie d’énergie et à d’autres fins












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX R


ICS 29.180 ISBN 978-2-8322-0913-4



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61558-2-26:2014
– 2 – 61558-2-26 © IEC:2013
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements . 8
5 General notes on test . 8
6 Ratings . 9
7 Classification . 9
8 Marking and other information . 9
9 Protection against electric shock . 10
10 Change of input voltage setting . 11
11 Output voltage and output current under load . 11
12 No-load output voltage . 12
13 Short-circuit voltage . 12
14 Heating. 12
15 Short circuit and overload protection . 13
16 Mechanical strength . 13
17 Protection against harmful ingress of dust, solid objects and moisture . 13
18 Insulation resistance, dielectric strength and leakage current . 13
19 Construction . 13
20 Components . 15
21 Internal wiring . 15
22 Supply connection and other external flexible cables or cords . 15
23 Terminals for external conductors . 15
24 Provisions for protective earthing . 15
25 Screws and connections . 15
26 Creepage distances, clearances and distances through insulation . 15
27 Resistance to heat, fire and tracking . 15
28 Resistance to rusting . 15
Annexes . 16
Annex B (normative) Testing a series of transformers . 16
Annex L (normative) Routine tests (production test) . 16
Annex AA (informative) Saving energy . 17
Annex BB (informative) Incorporated transformers . 18
Bibliography . 19

Table 101 – Output voltage difference . 12

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SIST EN 61558-2-26:2014
61558-2-26 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –

Part 2-26: Particular requirements and tests for transformers and
power supply units all for saving energy and other purposes

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 61558-2-26 has been prepared by IEC technical committee 96:
Transformers, reactors, power supply units and combinations thereof.
The text of this standard is based on the following documents:
FDIS Report on voting
96/400/FDIS 96/404/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN 61558-2-26:2014
– 4 – 61558-2-26 © IEC:2013
This part is intended to be used in conjunction with the latest edition of IEC 61558-1 and its
amendments. It is based on the second edition (2005) of that standard.
This part supplements or modifies the corresponding clauses in IEC 61558-1, so as to convert
that publication into the IEC standard: Particular requirements and tests for transformers and
power supply units all for saving energy and other purposes.
A list of all parts of the IEC 61558 series, under the general title: Safety of transformers,
reactors, power supply units and combination thereof, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
Where a particular subclause of Part 1 is not mentioned in this part that subclause applies as
far as is reasonable. Where this part states "addition", "modification" or "replacement", the
relevant text of Part 1 is to be adapted accordingly.
In this part the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type:
In the text of this part, the words in bold are defined in Clause 3.
Subclauses, notes, figures and tables additional to those in Part 1 are numbered starting from
101; supplementary annexes are entitled AA, BB, etc.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip them for conducting new or revised
tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation
nationally not earlier than 12 months from the date of publication.

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SIST EN 61558-2-26:2014
61558-2-26 © IEC:2013 – 5 –
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –

Part 2-26: Particular requirements and tests for transformers and
power supply units all for saving energy and other purposes



1 Scope
Replacement:
This part of IEC 61558 deals with the safety of transformers, power supply units and
switch mode power supply units all for saving energy and other purposes in electrical
installations by adjusting the output voltage and/or other electrical characteristics on the
output circuits without interruption affected by the transformers, power supply unit and
switch mode power supply unit.
NOTE 1 Safety includes electrical, thermal and mechanicals aspects.
The saving of energy is obtained by voltage stabilization and/or voltage adjusting of the
electrical installation. This standard may also be used for power supply units and switch
mode power supply units intended to be used where adjusting of the voltage or other
electrical characteristics is required by the final application.
NOTE 2 An example of electrical installation is lighting installations, outdoor or indoor.
NOTE 3 In special applications the reduction of the output voltage may affect the safety and the performance of
the supplied equipment.
This part applies to single-phase or three-phase transformers, power supply units and
switch mode power supply units all for saving energy which are air-cooled (natural or
forced), independent or incorporated and containing transformers and/or power supply
units from the following parts of the IEC 61558 series:
Part 2-1: Particular requirements and tests for separating transformers and power supplies
incorporating separating transformers for general applications.
Part 2-4: Particular requirements and tests for isolating transformers and power supply units
incorporating isolating transformers.
Part 2-6: Particular requirements and tests for safety isolating transformers and power supply
units incorporating safety isolating transformers.
Part 2-13: Particular requirements and tests for auto transformers and power supply units
incorporating auto transformers.
Part 2-14: Particular requirements and tests for variable transformers and power supply units
incorporating variable transformers.
Part 2-16: Particular requirements and tests for switch mode power supply units and
transformers for switch mode power supply units.
The rated supply voltage does not exceed 1 000 V a.c., and the rated supply frequency
does not exceed 500 Hz.

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SIST EN 61558-2-26:2014
– 6 – 61558-2-26 © IEC:2013
This standard is applicable to linear powers supply units with internal operational
frequency not exceeding 500 Hz.
This standard in combination with part 2-16 is also applicable to switch mode power supply
unit and transformer all for saving energy with internal operating frequency higher than 500
Hz.
For specific application corresponding to the other parts 2 of IEC 61558 series, the necessary
requirements of the relevant parts 2 are applicable. In addition, the requirements listed in this
part apply.
When two requirements are in conflict, the most severe take precedence.
The rated output does not exceed:
– 150 kVA for single-phase transformer, power supply unit and switch mode power
supply unit all for saving energy;
– 400 kVA for three-phase transformer, power supply unit and switch mode power
supply unit all for saving energy.
This part is also applicable to transformer, power supply unit and switch mode power
supply unit all for saving energy without limitation of the rated output subject to an
agreement between the purchaser and the manufacturer.
The standard is also not applicable to external circuits and their components intended to be
connected to the input terminals and/or output terminals of the transformer, power supply
unit and switch mode power supply unit all for saving energy.
This standard is not applicable to other devices having similar functions, for example double
level control gears, electronic control gears and specific dimmers covered by other standards.
Measures to protect the enclosure and components inside the enclosure against external
influences such as fungus, vermin, termites, solar-radiation, and icing shall also be
considered.
The different conditions for transportation, storage, and operation of the transformer, power
supply unit and switch mode power supply unit all for saving energy shall also be
considered.
Additional requirements in accordance with other appropriate standards and national rules
may be applicable to transformer, power supply unit and switch mode power supply unit
all for saving energy intended for use in special environments, such as tropical environment.
2 Normative references
This clause of Part 1 is applicable, except as follows.
Addition:
IEC 61558-1:2005, Safety of power transformers, power supplies, reactors and similar
products – Part 1: General requirements and tests
IEC 61558-2-13, Safety of transformers, reactors, power supply units and similar products for
supply voltages up to 1 100 V – Part 2-13: Particular requirements and tests for auto
transformers and power supply units incorporating auto transformers

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SIST EN 61558-2-26:2014
61558-2-26 © IEC:2013 – 7 –
IEC 61558-2-14, 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
IEC 61558-2-16, Safety of transformers, reactors, power supply units and similar products for
voltages up to 1 100 V – Part 2-16: Particular requirements and tests for switch mode power
supply units and transformers for switch mode power supply units
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
When the term transformer is used it covers transformer, power supply unit and/or switch
mode power supply unit all for saving energy as defined in this part.
3.1 Transformers
Addition:
3.1.101
transformer, power supply unit and switch mode power supply unit all for saving
energy
devices including multiple components which together adjust the output voltage and/or
electrical characteristics on the output circuits and thereby saving energy in end-products like
streetlights
3.4 Circuits and windings
Addition:
3.4.5.101
internal by-pass
electronic or electromechanical by-pass system included in the transformer, which in case of
malfunction connects the input supply and the output line
Note 1 to entry: The internal by-pass can operate automatically and/or manually.
Note 2 to entry: Switch-off devices for maintenance tasks or protective devices are not considered internal by-
pass systems.
3.5 Ratings
Addition:
3.5.1.101
operation rated supply voltage range
supply voltage range assigned by the manufacturer to the transformer, power supply unit
and switch mode power supply unit all for saving energy, within which the output voltage
and/or other electrical characteristics on the output circuits is stabilized during operation
Note 1 to entry: This range shall be not lower than ± 10 % from the rated supply voltage, and it will be the one
used to calculate the rated supply voltage range required for output voltage test.
3.5.4.101
rated minimum output current
output current assigned by the manufacturer to guarantee the correct operating conditions of
the transformer, power supply unit and switch mode power supply unit all for saving
energy

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SIST EN 61558-2-26:2014
– 8 – 61558-2-26 © IEC:2013
Note 1 to entry: For the definition of rated output current see 3.5.4 of Part 1.
3.5.7.101
rated minimum output
rated output assigned by the manufacturer to guarantee the correct operating conditions of
the transformer, power supply unit and switch mode power supply unit all for saving
energy
Note 1 to entry: For the definition of rated output see 3.5.7 of Part 1.
3.5.7.102
output level
level expressed as a voltage or an output that supplies the load and ensure that all the
devices connected continue to operate properly assigned by the manufacturer and expressed
in volts or as percentage of the rated output
Note 1 to entry: When the voltage stabilization and power reduction is performed by adjusting the voltage, the
output level is expressed in volt. In other cases the output level is expressed as a percentage of rated output.
3.5.7.102.1
nominal output level
output level assigned by the manufacturer for supplying the load with its rated voltage and
100 % of the output
3.5.7.102.2
start output level
output level assigned by the manufacturer ensuring that all devices connected will start
properly
3.5.7.103.3
minimum output level
output level assigned by the manufacturer ensuring that all the devices connected continue
to operate properly
3.5.7.103
output level change speed
speed assigned by the manufacturer for changes from one output level to another
Note 1 to entry: Depending on how the reduction output is set, the output levels change speed is expressed in
volt/minute or in percentage % rated output/minute.
Note 2 to entry: The output level change speed is assigned by the manufacturer.
Note 3 to entry: Output level change speed depends of the characteristics of the components to the installation
(type of lamps, minimum voltage change speed, etc.).
3.5.7.104
stabilization time
time to return to the output voltage for each output level when the rated supply voltage is set
from minimum to maximum operation rated supply voltage range assigned by the
manufacturer for each output level
4 General requirements
This clause of Part 1 is applicable.
5 General notes on test
This clause of Part 1 is applicable.

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SIST EN 61558-2-26:2014
61558-2-26 © IEC:2013 – 9 –
6 Ratings
This clause of Part 1 is applicable except as follows:
Addition:
6.101 The rated supply voltages and rated output voltages shall not exceed 1 000 V a.c. The
rated supply frequency shall not exceed 500 Hz.
For specific applicati
...