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

IEC 61558-2-26:2013 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. 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.
This publication is to be read in conjunction with IEC 61558-1:2005.

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

La CEI 61558-2-26:2013 traite de la sécurité des transformateurs, des blocs d'alimentation et/ou des blocs d'alimentation à découpage entièrement destinés à l'économie d'énergie et à d'autres fins dans les installations électriques, au moyen d'un réglage de la tension secondaire et/ou d'autres caractéristiques électriques des circuits secondaires sans interruption des transformateurs, des blocs d'alimentation et/ou des blocs d'alimentation à découpage. L'attention des Comités nationaux est attirée sur le fait que les fabricants d'appareils et les organismes d'essai peuvent avoir besoin d'une période transitoire après la publication d'une nouvelle publication CEI, ou d'une publication amendée ou révisée, pour fabriquer des produits conformes aux nouvelles exigences et pour adapter leurs équipements aux nouveaux essais ou aux essais révisés. Le comité recommande que le contenu de la présente publication soit entériné au niveau national au plus tôt 12 mois après la date de publication.
Cette publication doit être lue conjointement avec la CEI 61558-1:2005.

General Information

Status
Published
Publication Date
09-Jul-2013
Current Stage
PPUB - Publication issued
Start Date
10-Jul-2013
Completion Date
10-Jul-2013
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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
IEC 61558-2-26:2013
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
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
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
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.

---------------------- Page: 5 ----------------------
– 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.
---------------------- Page: 6 ----------------------
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.
---------------------- Page: 7 ----------------------
– 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
---------------------- Page: 8 ----------------------
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
---------------------- Page: 9 ----------------------
– 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.
---------------------- Page: 10 ----------------------
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 application corresponding to the other parts 2 of IEC 61558 series, the necessary

requirements of the relevant parts 2 are applicable in addition to the requirements listed in

this part. Where two requirements are in conflict, the most severe take precedence.

This standard in combination with part 2-16 is also applicable to switch mode power supply

and for transformer, power supply unit and switch mode power supply unit all for saving

energy with internal operational frequency higher than 500 Hz and with rated output

exceeding to 1 kVA.
6.102 The rated output shall not exceed:
– 150 kVA for single-phase transformer, power supply unit and switch mode power

supply unit all for saving energy, except for transformer and power supply unit all for

saving energy subject to an agreement between the purchasers and the manufacturer;

– 400 kVA for three-phase transformer and power supply unit all for saving energy,

except for transformer and power supply unit all for saving energy subject to an
agreement between the purchaser and the manufacturer.
7 Classification
This clause of Part 1 is applicable except as follows:
Replacement:
7.3 According to the location:
– Indoor, or
– outdoor

and according to the degree of protection ensured by the enclosure and defined in

accordance with IEC 60529 (IP code).
Addition:
7.101 According to the type of regulation of the output voltages for three phase
transformer, power supply unit and switch mode power supply unit all for saving
energy:
– designed to supply single phase load;
– designed to supply three phase load.
8 Marking and other information
This clause of Part 1 is applicable except as follows:
8.6
---------------------- Page: 11 ----------------------
– 10 – 61558-2-26 © IEC:2013
Addition:

If auxiliary input terminals are used, it (control signal, communication channel, etc.) shall be

clearly indicated in the transformer, power supply unit and switch mode power supply

unit all for saving energy.
8.11
Addition:
Symbol or graphical symbol Explanation or title Identification
Transformer and power supply
IEC 60417-6177
unit all for saving energy.
(DB:2012-11)
8.13
Addition:

Three-phase transformer, power supply unit and switch mode power supply unit all for

saving energy that is formed by three or more independent single-phase transformer,

power supply unit
...

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