Safety of transformers, reactors, power supply units and combinations thereof - Part 2-10: Particular requirements and tests for separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V

IEC 61558-2-10:2014 deals with the safety of separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V. Transformers incorporating electronic circuits are also covered by this standard. This first edition cancels and replaces Chapter ll Section Three of IEC 60989 published in 1991. It constitutes a technical revision. The main changes consist of
a) updating this part in accordance with IEC 61558-1:2005, and
b) adding power supply units to the scope. 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. The transitional period is not longer than 3 years after the publication of this standard.
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 2-10: Règles particulières et essais pour les transformateurs d'isolement à enroulements séparés à niveau d'isolement élevé et pour les transformateurs d'isolement à enroulements séparés à tensions secondaires supérieures à 1 000 V

L'IEC 61558-2-10:2014 traite de la sécurité des transformateurs d'isolement à enroulements séparés à niveau d'isolement élevé et des transformateurs d'isolement à enroulements séparés à tensions secondaires supérieures à 1 000 V. Les transformateurs incorporant des circuits électroniques sont également couverts par la présente norme. La présente première édition annule et remplace le Chapitre ll Section trois de l'IEC 60989 publiée en 1991. Elle constitue une révision technique. Les principales modifications consistent en
a) la mise à jour de la présente partie, conformément à l'IEC 61558-1:2005, et
b) l'ajout des blocs d'alimentation dans le domaine d'application. 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 IEC, 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 cette publication soit entériné au niveau national au plus tôt 12 mois après la date de publication. La période transitoire ne dépasse pas 3 ans après la publication de la présente norme.
Cette publication doit être lue conjointement avec la CEI 61558-1:2005.

General Information

Status
Published
Publication Date
09-Apr-2014
Current Stage
PPUB - Publication issued
Start Date
10-Apr-2014
Completion Date
10-Apr-2014
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IEC 61558-2-10:2014 - Safety of transformers, reactors, power supply units and combinations thereof - Part 2-10: Particular requirements and tests for separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V
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IEC 61558-2-10
Edition 1.0 2014-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of transformers, reactors, power supply units and combinations thereof –
Part 2-10: Particular requirements and tests for separating transformers with
high insulation level and separating transformers with output voltages
exceeding 1 000 V
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments –

Partie 2-10: Règles particulières et essais pour les transformateurs d'isolement à

enroulements séparés à niveau d'isolement élevé et pour les transformateurs
d'isolement à enroulements séparés à tensions secondaires supérieures
à 1 000 V
IEC 61558-2-10:2014-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61558-2-10
Edition 1.0 2014-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of transformers, reactors, power supply units and combinations thereof –
Part 2-10: Particular requirements and tests for separating transformers with
high insulation level and separating transformers with output voltages
exceeding 1 000 V
Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des
combinaisons de ces éléments –
Partie 2-10: Règles particulières et essais pour les transformateurs d'isolement
à enroulements séparés à niveau d'isolement élevé et pour les transformateurs
d'isolement à enroulements séparés à tensions secondaires supérieures
à 1 000 V
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 29.180 ISBN 978-2-8322-1513-5

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 – IEC 61558-2-10:2014 © IEC 2014
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ....................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 General requirements ...................................................................................................... 7

5 General notes on tests ..................................................................................................... 7

6 Ratings ............................................................................................................................ 7

7 Classification ................................................................................................................... 8

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

9 Protection against electric shock .................................................................................... 10

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

11 Output voltage and output current under load ................................................................. 10

12 No-load output voltage ................................................................................................... 10

13 Short-circuit voltage ....................................................................................................... 11

14 Heating .......................................................................................................................... 11

15 Short-circuit and overload protection .............................................................................. 11

16 Mechanical strength ....................................................................................................... 11

17 Protection against harmful ingress of dust, solid objects and moisture ............................ 11

18 Insulation resistance, dielectric strength and leakage current ......................................... 11

19 Construction .................................................................................................................. 12

20 Components .................................................................................................................. 13

21 Internal wiring ................................................................................................................ 13

22 Supply connection and other external flexible cable or cords .......................................... 13

23 Terminals for external conductors .................................................................................. 13

24 Provisions for protective earthing ................................................................................... 13

25 Screws and connections ................................................................................................ 13

26 Creepage distances, clearances and distances through insulation .................................. 13

27 Resistance to heat, fire and tracking .............................................................................. 15

28 Resistance to rusting ..................................................................................................... 15

Annexes ................................................................................................................................ 15

Table 101 – Output voltage difference ................................................................................... 11

Table 102 – Table of dielectric strength test voltages ............................................................. 12

Table 103 – Clearances distances for homogenous fields and inhomogeneous fields ............ 14

Table 104 – Creepage distances for material group III a, II and I (CTI > 175) for basic

or supplementary insulation ................................................................................................... 15

---------------------- Page: 4 ----------------------
IEC 61558-2-10:2014 © IEC 2014 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS, POWER
SUPPLY UNITS AND COMBINATIONS THEREOF –
Part 2-10: Particular requirements and tests for separating
transformers with high insulation level and separating
transformers with output voltages exceeding 1 000 V
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 61558-2-10 has been prepared by IEC technical committee 96:

Transformers, reactors, power supply units, and combinations thereof.

This first edition cancels and replaces Chapter ll Section Three of IEC 60989 published in

1991.
It constitutes a technical revision. The main changes consist of
a) updating this part in accordance with IEC 61558-1:2005, and
b) adding power supply units to the scope.
---------------------- Page: 5 ----------------------
– 4 – IEC 61558-2-10:2014 © IEC 2014
The text of this standard is based on the following documents:
FDIS Report on voting
96/407/FDIS 96/408/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.

This Part 2-10 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 and its

Amendement 1 (2009).

This Part 2-10 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 separating

transformers with high insulation level and separating transformers with output voltages

exceeding 1 000 V.

A list of all parts of the IEC 61558 series, under the general title: Safety of transformers,

reactors, power supply units and combinations 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.

When 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 adopted accordingly.
In this part, the following print types are used:
− requirements proper: in roman type;
− test specifications: in italic type;
− explanatory matters: 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 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.

The transitional period is not longer than 3 years after the publication of this standard.

---------------------- Page: 6 ----------------------
IEC 61558-2-10:2014 © IEC 2014 – 5 –
SAFETY OF TRANSFORMERS, REACTORS, POWER
SUPPLY UNITS AND COMBINATIONS THEREOF –
Part 2-10: Particular requirements and tests for separating
transformers with high insulation level and separating
transformers with output voltages exceeding 1 000 V
1 Scope
Replacement:

This part of IEC 61558 deals with the safety of separating transformers with high insulation

level and separating transformers with output voltages exceeding 1 000 V. Transformers

incorporating electronic circuits are also covered by this standard.
NOTE 1 Safety includes electrical, thermal and mechanical aspects.

Unless otherwise specified, from here onward, the term transformer covers separating

transformers with high insulation level and separating transformers with output voltages

exceeding 1 000 V a.c or 1 500 V d.c .

This Part 2-10 is applicable to stationary or portable, single-phase or polyphase, air-cooled

(natural or forced) independent or associated dry-type transformers. The windings may be

encapsulated or non-encapsulated.

This standard is applicable to transformers and power supply (linear) with internal

operational frequencies not exceeding 500 Hz.

This standard used in combination with Part 2-16 for switch mode power supply units

(SMPS) is also applicable to power supplies with internal operational frequencies higher than

500 Hz. Where the two requirements are in conflict the most severe take precedence.

The rated supply voltage does not exceed 1 000 V a.c., and the rated supply frequency and

the internal operating frequency do not exceed 500 Hz.
The rated output does not exceed:
– 25 kVA for single-phase transformers;
– 40 kVA for polyphase transformers.

This Part 2-10 is applicable to transformers without limitation of the rated output subject to

an agreement between the purchaser and the manufacturer.
Where applicable the no-load output voltage or the rated output voltage:

– does not exceed 1 000 V a.c. or 1 500 V d.c. for separating transformers with high

insulation level;

– does exceed 1 000 V a. c or 1 500 V d.c. and does not exceed 15 000 V a.c. or 15 000 V

d.c. for separating transformer with output voltage exceed 1 000 V.
This Part 2-10 is not applicable to:
– transformers covered by IEC 60076-11;
---------------------- Page: 7 ----------------------
– 6 – IEC 61558-2-10:2014 © IEC 2014
– neon transformers covered by IEC 61050 and

– power supplies and converters for use with or in products according to IEC 61347-2-10.

This Part 2-10 is not applicable to external circuits and their components intended to be

connected to the input terminals and output terminals of the transformers.

Transformers covered by this Part 2-10 are used only in applications where double or

reinforced insulation between circuits is not required by the installation rules or by the end

product standard.

NOTE 2 Normally, the transformers are intended to be used with equipment to provide voltages different from the

supply voltage for the functional requirements of the equipment. The protection against electric shock can be

provided (or completed) by other features of the equipment, such as the body. Parts of output circuits can be

connected to the input circuits or to protective earth.

This Part 2-10 is applicable to transformers associated with specific equipment, to the extent

decided upon by the relevant IEC technical committees.
NOTE 3 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.) can 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 can also be considered;

– the different conditions for transportation, storage, and operation of the can also be considered;

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

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

NOTE 4 Future technological development of transformers can necessitate a need to increase the upper limit of

the frequencies, until then this Part 2-10 can be used as a guidance document.
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
Amendment 1:2009

IEC 61558-2-16, 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
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
The third paragraph is not applicable.
3.1 Transformers
Addition:
---------------------- Page: 8 ----------------------
IEC 61558-2-10:2014 © IEC 2014 – 7 –
3.1.101
separating transformer with high insulation level
a separating transformer where the output voltage does not exceed 1 000 V a.c or
1 500 V d.c and does exceed 50 V a.c or d.c for independent transformer

Note 1 to entry: The output winding(s) are isolated from both, input winding(s) and body for a working voltage

exceeding 1 000 V. a.c or 1 500 V d.c but not exceeding 15 000 V a.c or 15 000 V d.c.

3.1.102
separating transformer with output voltages exceeding 1 000 V

a separating transformer the output circuits of which are designed to give voltages

exceeding 1 000 V a.c or 1 500 V d.c and not exceeding 15 000 V a.c or 15 000 V d.c

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 not applicable.
Replacement:
6.101 The rated output voltage is limited as follows:
For separating transformers with high insulation level:

– the no-load output voltage or the rated output voltage shall not exceed 1 000 V a.c. or

1 500 V d.c.;

for independent transformers the rated output voltage shall exceed 50 V a.c. or d.c. and

this output voltage applies even when output windings, not intended for interconnection, are

connected in series.
For separating transformers with no load output voltages exceeding 1 000 V:

– the rated output voltage shall exceed 1 000 V a.c. or 1 500 V d.c. and shall not exceed

15 000 V a.c. or 15 000 V d.c.;

– for independent transformers this output voltage limitations applies even when output

windings, not intended for interconnection, are connected in series.
6.102 The rated output shall not exceed:
– 25 kVA for single-phase transformers;
– 40 kVA for polyphase transformers;

Transformers without limitation of the rated output shall be subject to agreement between the

purchaser and the manufacturer.

6.103 The rated supply frequency and the internal operating frequencies shall not exceed

500 Hz.
---------------------- Page: 9 ----------------------
– 8 – IEC 61558-2-10:2014 © IEC 2014
6.104 The rated supply voltage shall not exceed 1 000 V a.c.

Compliance with the requirements of 6.101 to 6.104 is checked by inspection of the marking.

7 Classification
This clause of Part 1 is applicable.
8 Marking and other information
This clause of Part 1 is applicable except as follows:
8.1 h) Replacement:

Replace the first sentence by the following: relevant graphical symbols shown in 8.11 indicating

the kind of transformer;
The voltage of the insulation level, expressed in kV is not a part of the symbol
8.11 Addition:
Symbol or graphical symbol Explanation or title Identification
IEC 60417-6063
Separating transformer, high insulation
level, general
To identify the separating transformer with
high insulation level, where the letter "F"
may be used adjacent to the symbol to
indicate a fail-safe function.
The voltage of the insulation level,
expressed in kV, may be added adjacent to
the symbol.
IEC 60417-6064
Separating transformer, high insulation
level, non-short-circuit-proof
To identify the non-short-circuit-proof
separating transformer with high insulation
level.
The voltage of the insulation level,
expressed in kV, may be added adjacent to
the symbol
---------------------- Page: 10 ----------------------
IEC 61558-2-10:2014 © IEC 2014 – 9 –
Symbol or graphical symbol Explanation or title Identification
Separating transformer, high insulation IEC 60417-6065
level, short-circuit-proof
To identify the short-circuit-proof (inherently
or non-inherently) separating transformer
with high insulation level.
The voltage of the insulation level,
expressed in kV, may be added adjacent to
the symbol.
Separating transformer, output voltages IEC 60417-6066
exceeding 1 kV, general
To identify the separating transformer with
output voltages exceeding 1 000 V and not
exceeding 15 000 V, where the letter "F"
may be used adjacent to the symbol to
indicate a fail-safe function.
IEC 60417-6067
Separating transformer, output voltages
exceeding 1 kV, non-short-circuit-proof
To identify the non-short-circuit-proof
separating transformer with output voltages
exceeding 1 000 V and not exceeding
15 000 V.
IEC 60417-6068
Separating transformer, output voltages
exceeding 1 kV, short-circuit-proof
To identify the short-circuit-proof (inherently
or non-inherently) separating transformer
with output voltages exceeding 1 000 V and
not exceeding 15 000 V.
---------------------- Page: 11 ----------------------
– 10 – IEC 61558-2-10:2014 © IEC 2014
Addition:

8.101 Separating transformers with high insulation level shall be marked with the voltage

of the insulation level, expressed in kV on the right side of the symbol.
9 Protection against electric shock
This clause of Part 1 is applicable.
10 Change of input voltage setting
This clause of Part 1 is applicable.
11 Output voltage and output current under load
This clause of Part 1 is applicable.
12 No-load output voltage
This clause of Part 1 is applicable except as follows:
Addition:

The no-load voltage is measured when the transformer is connected to the rated supply

voltage at the rated supply frequency at ambient temperature.
12.101 For separating transformers with high insulation level:

– the no load output voltage shall not exceed 1 000 V a.c. or 1 500 V d.c. For independent

transformers the no-load output voltage shall exceed 50 V a.c. or d.c. This limitation

applies even when independent output windings, not intended for interconnection, are

connected in series;
12.102 For separating transformers with output voltages exceeding 1 000 V:
– the no-load output voltage shall exceed 1 000 V a.c. or 1 500 V d.c. and s
...

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