Safety of transformers, reactors, power supply units and similar products for supply 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

IEC 61558-2-16:2009 deals with the safety of switch mode power supply units and transformers for switch mode power supply units. Transformers incorporating electronic circuits are also covered by this standard. This Part 2-16 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 first edition of IEC 61558-2-16 cancels and replaces IEC 61558-2-17, published in 1997. It constitutes a technical revision. This part has the status of a group safety publication in accordance with IEC Guide 104 (1997): The preparation of safety publications and the use of basic safety publications and group safety publications.

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et produits analogues pour des tensions d'alimentation jusqu'à 1 100 V - Partie 2-16: Règles particulières et essais pour les blocs d'alimentation à découpage et les transformateurs pour blocs d'alimentation à découpage

La CEI 61558-2-16:2009 traite de la sécurité des blocs d'alimentation à découpage et des transformateurs pour blocs d'alimentation à découpage. Les transformateurs incorporant des circuits électroniques sont également couverts par la présente norme. La présente partie est destinée à être utilisée avec la dernière édition de la CEI 61558-1 et ses amendements. Elle est issue de la seconde édition (2005) de cette norme. Cette première édition de la CEI 61558-2-16 annule et remplace la CEI 61558-2-17 (1997). Elle constitue une révision technique. La présente partie a le statut de publication groupée de sécurité conformément au guide CEI 104 (1997): Elaboration des publications de sécurité et utilisation des publications fondamentales de sécurité et publications groupées de sécurité.

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Status
Published
Publication Date
16-Jun-2009
Current Stage
PPUB - Publication issued
Start Date
17-Jun-2009
Completion Date
17-Jun-2009
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IEC 61558-2-16:2009 - Safety of transformers, reactors, power supply units and similar products for supply 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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IEC 61558-2-16
Edition 1.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and similar products for
supply 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
Sécurité des transformateurs, bobines d’inductance, blocs d'alimentation et
produits analogues pour des tensions d’alimentation jusqu'à 1 100 V –
Partie 2-16: Règles particulières et essais pour les blocs d'alimentation à
découpage et les transformateurs pour blocs d'alimentation à découpage
IEC 61558-2-16:2009
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61558-2-16
Edition 1.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and similar products for
supply 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
Sécurité des transformateurs, bobines d’inductance, blocs d'alimentation et
produits analogues pour des tensions d’alimentation jusqu'à 1 100 V –
Partie 2-16: Règles particulières et essais pour les blocs d'alimentation à
découpage et les transformateurs pour blocs d'alimentation à découpage
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.180 ISBN 978-2-88910-543-4
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61558-2-16 © IEC:2009
CONTENTS

FOREWORD...........................................................................................................................4

1 Scope...............................................................................................................................6

2 Normative references........................................................................................................8

3 Terms and definitions .......................................................................................................9

4 General requirements .......................................................................................................9

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

6 Ratings.............................................................................................................................9

7 Classification ..................................................................................................................10

8 Marking and other information.........................................................................................10

9 Protection against electric shock.....................................................................................11

10 Change of input voltage setting .......................................................................................12

11 Output voltage and output current under load ..................................................................12

12 No-load output voltage....................................................................................................12

13 Short circuit voltage ........................................................................................................13

14 Heating...........................................................................................................................13

15 Short-circuit and overload protection ...............................................................................13

16 Mechanical strength........................................................................................................14

17 Protection against harmful ingress of dust, solid objects and moisture.............................14

18 Insulation resistance, dielectric strength and leakage current ..........................................14

19 Construction ...................................................................................................................14

20 Components ...................................................................................................................18

21 Internal wiring .................................................................................................................18

22 Supply connection and other external flexible cables or cords..........................................19

23 Terminals for external conductors ...................................................................................19

24 Provisions for protective earthing ....................................................................................19

25 Screws and connections .................................................................................................19

26 Creepage distances, clearances and distances through insulation ...................................19

27 Resistance to heat, fire and tracking ...............................................................................32

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

Annexes................................................................................................................................33

Annex AA (informative) Partial discharge (PD) test ...............................................................33

Annex BB (normative) Particular requirements for associated transformers for use in

switch mode power supplies with internal frequencies > 500 Hz .............................................33

Figure 101 – Diagram for dimensioning of clearances............................................................20

Figure 102 – Diagram of dimensioning creepage distances....................................................24

Figure 103 – Permissible field strength for dimensioning of solid insulation according to

Equation (1) ..........................................................................................................................32

Table 101 – Output voltages ratio..........................................................................................13

Table 102 – Values of clearances for frequencies > 30 kHz with approximately

homogeneous field condition according to 4.3 of IEC 60664-4 ...............................................21

---------------------- Page: 4 ----------------------
61558-2-16 © IEC:2009 – 3 –

Table 103 – Values of clearances for transient overvoltages or recurring peak voltages

produced in the primary circuit of the SMPS for frequencies < 30 kHz....................................22

Table 104 – Minimum values of clearances in air for inhomogeneous field conditions for

frequency > 30 kHz ...............................................................................................................

Table 105 – Basic or supplementary insulation – Minimum values of creepage distances

for different frequency ranges (pollution degree 1).................................................................25

Table 106 – Basic or supplementary insulation – Minimum values of creepage distances

for different frequency ranges (pollution degree 2).................................................................26

Table 107 – Basic or supplementary insulation – Minimum values of creepage distances

for different frequency ranges (pollution degree 3).................................................................27

Table 108 – Double or reinforced insulation – Minimum values of creepage distances for

different frequency ranges (pollution degree 1) ......................................................................28

Table 109 – Double or reinforced insulation – Minimum values of creepage distances for

different frequency ranges (pollution degree 2) ......................................................................29

Table 110 – Double or reinforced insulation – Minimum values of creepage distances for

different frequency ranges (pollution degree 3) ......................................................................30

---------------------- Page: 5 ----------------------
– 4 – 61558-2-16 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS
AND SIMILAR PRODUCTS FOR SUPPLY 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
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,

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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

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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 61558-2-16 has been prepared by IEC technical committee 96:

Transformers, reactors, power supply units and similar products for low voltage up to 1 100 V.

This first edition of IEC 61558-2-16 cancels and replaces IEC 61558-2-17, published in 1997. It

constitutes a technical revision.

This part has the status of a group safety publication in accordance with IEC Guide 104 (1997):

The preparation of safety publications and the use of basic safety publications and group

safety publications.
---------------------- Page: 6 ----------------------
61558-2-16 © IEC:2009 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
96/330/CDV 96/333/RVC

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.

This Part 2-16 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 switch mode power

supply units and transformers for switch mode power supply units.

A list of all parts of the IEC 61558 series can be found on the IEC website under the title:

Safety of transformers, reactors, power supply units and similar products for supply voltages up

to 1 100 V.

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

maintenance result 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 themselves 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: 7 ----------------------
– 6 – 61558-2-16 © IEC:2009
SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS
AND SIMILAR PRODUCTS FOR SUPPLY 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
1 Scope
Replacement:

This part of IEC 61558 deals with the safety of switch mode power supply units and

transformers for switch mode power supply units. Transformers incorporating electronic

circuits are also covered by this standard.
NOTE 1 Safety includes electrical, thermal and mechanical aspects.
This part applies to:

a) switch mode power supply units incorporating safety isolating transformers providing

SELV, PELV or FELV a.c. or d.c. output voltage(s), or a combination thereof according to

IEC 61140 and IEC 60364-4-41 for use with household and other consumer products,

except for products covered by IEC 60065, IEC 61347 series, IEC 61204-7 and IEC 60950-

b) switch mode power supply units with a maximum output voltage not exceeding 1 000 V

a.c. or 1 414 V ripple-free d.c. for use with household and other consumer products, except

for products covered in a) and products covered by IEC 60065, IEC 61347 series,
IEC 61204-7 and IEC 60950-1;

c) this standard may be used for transformers for use in switch mode power supply units

(see Annex BB).
This part covers the safety requirements for:
• separating SMPS for general use corresponding to Part 2-1;
• isolating SMPS for general use corresponding to Part 2-4;
• safety isolating SMPS for general use corresponding to Part 2-6;
• auto-SMPS for general use corresponding to Part 2-13.

For SMPS for specific application corresponding to the other Parts 2 of 61558 series, the

necessary requirements of the relevant Parts 2 are applicable. In addition, the requirements

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

precedence.

NOTE 2 As the maximum rated supply voltage of the internal transformer is 1 000 V, the maximum rated

supply voltage of the switch mode power supply may be lower due to type of rectification.

Switch mode power supply units covered by this standard are air cooled (natural or forced)

independent, associated, stationary, portable, single-phase, or polyphase, with the rated

supply voltage not exceeding 1 100 V a.c., the rated supply frequency not exceeding

500 Hz, the rated internal operating frequency exceeding 500 Hz, but not exceeding

100 MHz, and the rated output not exceeding 1 kVA or 1 kW, incorporating dry-type

transformers with encapsulated or non-encapsulated windings.
---------------------- Page: 8 ----------------------
61558-2-16 © IEC:2009 – 7 –

Associated transformers for switch mode power supply units covered by Annex BB of this

standard shall have a rated output not exceeding:
– 25 kVA for single-phase transformers;
– 40 kVA for polyphase transformers.

NOTE 3 For higher frequencies, additional requirements may be necessary. However, this standard may be used

as a guide.

The no-load output voltage or the rated output voltage of switch mode power supply

units shall not exceed:
– 1 000 V a.c. or 1 415 V ripple-free d.c. when separating transformers or auto-
transformers are used;
– 500 V a.c. or 708 V ripple-free d.c. when isolating transformers are used;

– 50 V a.c. or 120 V ripple-free d.c. when safety isolating transformers are used.

The no-load output voltage or the rated output voltage of independent switch mode

power supply units shall not be less than:

– 50 V a.c. or 120 V ripple-free d.c. when separating transformers or autotransformers are

used.

This standard is also applicable to switch mode power supply units, converters and inverters

without limitation of the rated output. However, such switch mode power supply units are

for special applications and are subject to an agreement between the purchaser and the

manufacturer.

NOTE 4 In the context of this standard, converters and invertors are considered to be switch mode power supply

units.

This standard may also be used as a guide for products not covered by the scope of this

standard, the scope of IEC 61204-7, or the scope of IEC 61347 series.
This standard does not apply to:
– motor-generator sets;
– uninterruptible power supplies (UPS) according to IEC 62040;

– switch mode power supply units covered by IEC 61204-7 (i.e., low-voltage power supply

devices, d.c. output, performance characteristics) and d.c. power and distribution

equipment and switch mode power supply units for use in applications covered by
IEC 60950-1, IEC 61010-1, IEC 60601-1, and IEC 60065;
– lamp control gear covered by IEC 61347-1;

– external circuits and their components intended to be connected to the input terminals and

output terminals of the transformers.
NOTE 5 IEC 61204-7 will be updated by SC 22E.
NOTE 6 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.) may be necessary;

– measures to protect the enclosure and the components inside the enclosure against external influences such

as fungus, vermin, termites, solar-radiation, and icing should also be considered;

– the different conditions for transportation, storage, and operation of the transformers should also be

considered;

– additional requirements in accordance with other appropriate standards and national rules may be applicable to

transformers intended for use in special environments, such as tropical environment.

---------------------- Page: 9 ----------------------
– 8 – 61558-2-16 © IEC:2009

NOTE 7 Future technological development of transformers may necessitate a need to increase the upper limit of

the frequencies; until then, this part may be used as a guidance document.

Unless otherwise specified, from here onward, the term SMPS covers switch mode power

supply units.
2 Normative references
This clause of Part 1 is applicable, except as follows:
Addition:

IEC 60227 (all parts), Polyvinyl chloride insulated cables of rated voltages up to and including

450/750 V

IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –

Protection against electric shock

IEC 60950-1, Information technology equipment – Safety – Part 1:General requirements

IEC 60601-1, Medical electrical equipment – Part 1:General requirements for basic safety and

essential performance

IEC 60664-4:2005, Insulation coordination for equipment within low-voltage systems – Part 4:

Consideration of high-frequency voltage stress

IEC 61010-1, Safety requirements for electrical equipment for measurement, control, and

laboratory use – Part 1:General requirements

IEC 61204-7:2006, Low voltage power supplies, d.c. output – Part 7:Safety requirements

IEC 61347 (all parts), Lamp controlgear

IEC 61558-1:2005, Safety of power transformers, power supplies, reactors and similar products

– Part 1: General requirements and tests

IEC 61558-2-1, Safety of power transformers, power supplies, reactors and similar products –

Part 2-1: Particular requirements and tests for separating transformers and power supplies

incorporating separating transformers for general applications

IEC 61558-2-4, Safety of transformers, reactors, power supply units and similar products for

supply voltages up to 1 100 V – Part 2-4: Particular requirements and tests for isolating

transformers and power supply units incorporating isolating transformers

IEC 61558-2-6, Safety of transformers, reactors, power supply units and similar products for

supply voltages up to 1 100 V – Part 2-6: Particular requirements and tests for safety isolating

transformers and power supply units incorporating safety isolating transformers

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
IEC 62040 (all parts), Uninterruptible power systems (UPS)
---------------------- Page: 10 ----------------------
61558-2-16 © IEC:2009 – 9 –
3 Terms and definitions
This clause of Part 1 is applicable, except as follows:
Addition:
The term transformer in Part 1 also designates a SMPS as defined by this part.

In Annex BB of this standard, the term transformer applies to a transformer for SMPS.

In this standard, the actual applicable terms are used.
Replacement
3.3.8
working voltage

highest r.m.s. value of the a.c. or d.c. voltage which may occur (locally) across any insulation

at rated supply voltage under no-load or normal operating conditions, transients being

disregarded. The working voltage between any point in the circuit supplied by the mains and

other isolated parts shall be assumed:
• the rated input voltage, or
• the measured working voltage
whichever is greater

NOTE 1 When considering the insulation system between windings not intended to be connected together, the

working voltage is considered to be the highest voltage occurring on any of these windings.

NOTE 2 On three phase systems, the working voltage can be different from the nominal voltage.

4 General requirements
This clause of Part 1 is applicable.
5 General notes on tests
This clause of Part 1 is applicable.
6 Ratings
This clause of Part 1 is applicable, except as follows:
Addition:
6.101 The rated output voltage shall not exceed:

– 1 000 V a.c. or 1 415 V ripple-free d.c. for SMPS incorporating separating transformers or

auto-transformers;

– 500 V a.c. or 708 V ripple-free d.c. for SMPS incorporating isolating transformers;

– 50 V a.c. or 120 V ripple-free d.c. for SMPS incorporating safety isolating transformers.

---------------------- Page: 11 ----------------------
– 10 – 61558-2-16 © IEC:2009

For independent SMPS incorporating separating transformers or auto-transformers, the

rated output voltage shall exceed 50 V a.c. or 120 V ripple-free d.c. and no
...

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