Safety of power transformers, power supplies, reactors and similar products -- Part 1: General requirements and tests

This International Standard deals with safety aspects of power  transformers, power supplies, reactors and similar products  such as electrical, thermal and mechanical safety. This  standard covers the following types of dry-type transformers,  power supplies, including switch mode power supplies, and  reactors, the windings of which may be encapsulated or non- encapsulated : a) Stationary or portable, single-phase or poly- phase, air-cooled (natural or forced), isolating and safety  isolating transformers, independent or associated, not forming a  part of distribution networks and with the following  characteristics: - rated supply voltage not exceeding 1 000 V  a.c.; - rated supply frequency not exceeding 500 Hz; and  complying with the following values, unless otherwise specified  in the relevant part 2: . for isolating transformers: - rated output  for single phase transformers, not exceeding 25 kVA, and for  poly-phase transformers not exceeding 40 kVA. - no-load  output voltage and the rated output voltage exceeding 50 V a.c.,  and not exceeding 500 V a.c, or 1 000 V a.c. to be in  accordance with the National Wiring Rules or for a special  application. for safety isolating transformers: - rated output for  single phase transformers not exceeding 10 kVA, and for poly- phase transformers not exceeding 16 kVA. - no-load output  voltage and the rated output voltage not exceeding 50 V a.c.  between conductors, or between any conductor and protective  earth.

Sicherheit von Transformatoren, Netzgeräten, Drosseln und dergleichen -- Teil 1: Allgemeine Anforderungen und Prüfungen

Sécurité des transformateurs, alimentations, bobines d'inductance et produits analogues -- Partie 1: Exigences générales et essais

b) Transformateurs ů enroulements séparés,  autotransformateurs, transformateurs variables et petites  bobines d'inductance, associés ou indépendants, ů  refroidissement par air (circulation naturelle ou forcée), fixes ou  mobiles, monophasés ou polyphasés ne constituant pas une  partie du réseau de distribution et présentant les  caractéristiques suivantes: - tension primaire assignée ne  dépassant pas 1 000 V en courant alternatif - fréquence  primaire assignée ne dépassant pas 500 Hz; et satisfaisant les  limites suivantes sauf spécification contraire dans la partie 2  appropriée: - une tension secondaire ů vide ou une tension  secondaire assignée pour les transformateurs associés ou  indépendants n'excédant pas 15 kV courant alternatif et pour  les transformateurs indépendants une tension secondaire  assignée égale ou supérieure ů 50 V courant alternatif - une  puissance assignée n'excédant pas les valeurs suivantes: - 1  kVA pour les transformateurs monophasés - 2 kVAR pour les  bobines d'inductance monophasées - 5 kVA pour les  transformateurs polyphasés - 10 kVAR pour les bobines  d'inductance polyphasées c) Stationary or portable, single- phase or polyphase, air-cooled (natural or forced), independent  or associated power supplies and switch mode power supplies  incorporating one or more transformer(s) of type a) or b), not  forming a part of distribution networks and with the following  characteristics: - rated supply voltage not exceeding 1 000 V  a.c.; - rated supply frequency not exceeding 500 Hz; - internal  operational frequency for power supplies not exceeding 500 Hz  and for switch mode power supplies not exceeding 100 MHz;  and with the following values, unless otherwise specified in the  relevant part 2: . for power supplies and switch mode power  supplies incorporating isolating transformers: - rated output for  single- phase or polyphase power supplies or switch mode  power supplies not exceeding 1 kVA; - no-load output voltage  and the rated output voltage exceeding 50 V a.c. or 120 V  ripple- free d.c., and not exceeding 500 V a.c. or 708 V ripple-  free d.c., or 1 000 V a.c. or 1 415 V ripple- free d.c. to be in  accordance with national wiring rules or for a special  application; for power supplies and switch mode power supplies  incorporating safety isolating transformers: - rated output for  single- phase or polyphase power supplies and switch mode  power supplies not exceeding 1 kVA; - no-load output voltage  and rated output voltage not exceeding 50 V a.c.or 120 V ripple-  free d.c. between conductors, or between any conductor and  protective earth. d) This standard is also applicable to t w - marked transformers with a rated output not exceeding 1 000  VA and where the t w -temperature does not exceed 140 °C (t  w 140). However, t w -marking of transformers is optional. This  standard also applies to transformers, power supplies, switch  mode power supplies, and reactors incorporating electronic  circuits. This standard does not apply to external circuits and  their components intended to be connected to the input and  output terminals or socket-outlets of the transformers, power  supplies and switch mode power supplies, and reactors.

Varnost močnostnih transformatorjev, napajalnikov, reaktorjev in podobnih izdelkov - 1. del: Splošne zahteve in preskusi (IEC 61558-1:2005) (vsebuje popravek AC:2006)

General Information

Status
Published
Publication Date
31-Aug-2006
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Sep-2006
Due Date
01-Sep-2006
Completion Date
01-Sep-2006

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SLOVENSKI STANDARD
SIST EN 61558-1:2006
01-september-2006
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SIST EN 61558-1:1999
SIST EN 61558-1:1999/A1:1999
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Safety of power transformers, power supplies, reactors and similar products -- Part 1:

General requirements and tests
Sicherheit von Transformatoren, Netzgeräten, Drosseln und dergleichen -- Teil 1:
Allgemeine Anforderungen und Prüfungen

Sécurité des transformateurs, alimentations, bobines d'inductance et produits analogues

-- Partie 1: Exigences générales et essais
Ta slovenski standard je istoveten z: EN 61558-1:2005
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 61558-1:2006 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61558-1:2006
---------------------- Page: 2 ----------------------
SIST EN 61558-1:2006
EUROPEAN STANDARD EN 61558-1
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2005
ICS 29.180 Supersedes EN 61558-1:1997 + A1:1998 + A11:2003
Incorporates Corrigendum August 2006
English version
Safety of power transformers, power supplies,
reactors and similar products
Part 1: General requirements and tests
(IEC 61558-1:2005)
Sécurité des transformateurs, Sicherheit von Transformatoren,
alimentations, bobines d'inductance Netzgeräten, Drosseln und dergleichen
et produits analogues Teil 1: Allgemeine Anforderungen und
Partie 1: Exigences générales et essais Prüfungen
(CEI 61558-1:2005) (IEC 61558-1:2005)

This European Standard was approved by CENELEC on 2005-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,

Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61558-1:2005 E
---------------------- Page: 3 ----------------------
SIST EN 61558-1:2006
EN 61558-1:2005 - 2 -
Foreword

The text of document 96/224/FDIS, future edition 2 of IEC 61558-1, prepared by IEC TC 96, Small

power transformers, reactors, power supply units and similar products, was submitted to the

IEC-CENELEC parallel vote and was approved by CENELEC as EN 61558-1 on 2005-10-01.

This European Standard supersedes EN 61558-1:1997 + corrigendum April 2003 + A1:1998 +

A11:2003.

The changes with respect to EN 61558-1:1997 were necessitated by the introduction of new

technology and implementation of requirements from equipment committees.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) –

This European Standard replaces EN 61558-1:1997 and its amendments. However, EN 61558-1:1997

remains valid until all the parts 2 that are used in conjunction with it have been withdrawn. No date of

withdrawal of conflicting national standards (dow) has therefore been fixed. However, when Part 1 is

used for products not covered by a part 2, EN 61558-1:1997 is not to be used after 2008-10-01.

This new edition of Part 1 is only to be used in conjunction with parts 2 based on this edition. The

parts 2 contain clauses to supplement or modify the corresponding clauses of this Part 1 in order to

provide the relevant requirements for each type of transformer.

However, individual countries may wish to consider its application, to the extent reasonable, to

transformers not mentioned in the parts 2, and to transformers designed on new principles.

NOTE Annex U contains the optional t system (marking, requirements and tests).
In this standard, 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 the standard, the words in bold are defined in Clause 3.
Annex ZA has been added by CENELEC.
The contents of the corrigendum of August 2006 have been included in this copy.
__________
---------------------- Page: 4 ----------------------
SIST EN 61558-1:2006
- 3 - EN 61558-1:2005
Endorsement notice

The text of the International Standard IEC 61558-1:2005 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 60038 NOTE Harmonized as HD 472 S1:1989 (modified).
IEC 60051 NOTE Harmonized in EN 60051 series (not modified).
IEC 60584-1 NOTE Harmonized as EN 60584-1:1995 (not modified).
IEC 60738-1 NOTE Harmonized as EN 60738-1:1999 (not modified).
IEC 60998-1 NOTE Harmonized as EN 60998-1:2004 (modified).
IEC 61000-3-2 NOTE Harmonized as EN 61000-3-2:2000 (modified).
IEC 61000-3-3 NOTE Harmonized as EN 61000-3-3:1995 (not modified).
IEC 62041 NOTE Harmonized as EN 62041:2003 (not modified).
CISPR 14 NOTE Harmonized in EN 55014 series (not modified).
__________
---------------------- Page: 5 ----------------------
SIST EN 61558-1:2006
EN 61558-1:2005 - 4 -
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
Publication Year Title EN/HD Year
IEC 60065 2001 Audio, video and similar electronic EN 60065 2002
(mod) apparatus - Safety requirements
IEC 60068-2-2 1974 Basic environmental testing procedures EN 60068-2-2 1993
Part 2: Tests - Tests B: Dry heat
2) 3)
IEC 60068-2-6 - Part 2: Tests - Test Fc: Vibration EN 60068-2-6 1995
(sinusoidal)
2) 3)

IEC 60068-2-32 - Part 2: Tests - Test Ed: Free fall (Procedure EN 60068-2-32 1993

2) 3)
IEC 60068-2-75 - Part 2-75: Tests - Test Eh: Hammer tests EN 60068-2-75 1997
2) 3)
IEC 60076-1 - Power transformers EN 60076-1 1997
(mod) Part 1: General + A11 1997
+ A12 2002
IEC/TR 60083 - Plugs and socket-outlets for domestic and - -
similar general use standardized in member
countries of IEC
IEC 60085 1984 Thermal evaluation and classification of HD 566 S1 1990
electrical insulation
IEC 60112 2003 Method for the determination of the proof EN 60112 2003
and the comparative tracking indices of solid
insulating materials
2) 3)
IEC 60127-3 - Miniature fuses EN 60127-3 1996
Part 3: Sub-miniature fuse-links + corr. June 1996
IEC 60216 Series Electrical insulating materials - Thermal EN 60216 Series
endurance properties
EN 60068-2-2:1993 includes supplement A:1976 to IEC 60068-2-2:1974.
Undated reference.
Valid edition at date of issue.
HD 566 S1 is superseded by EN 60085:2004, which is based on IEC 60085:2004.
---------------------- Page: 6 ----------------------
SIST EN 61558-1:2006
- 5 - EN 61558-1:2005
Publication Year Title EN/HD Year
IEC 60227 Series Polyvinyl chloride insulated cables of rated - -
voltages up to and including 450/750 V
IEC 60245 Series Rubber insulated cables - Rated voltages up - -
to and including 450/750 V
IEC 60269 Series Low-voltage fuses EN/HD 60269 series
(mod)
2) 3)
IEC 60269-2 - Part 2: Supplementary requirements for EN 60269-2 1995
fuses for use by authorized persons (fuses
mainly for industrial application)
2) 3)
IEC 60269-2-1 - Part 2-1: Supplementary requirements for HD 60269-2-1 2005
(mod) fuses for use by authorized persons (fuses
mainly for industrial application) Sections I
to VI: Examples of types of standardized
fuses
2) 3)
IEC 60269-3 - Part 3: Supplementary requirements for EN 60269-3 1995
fuses for use by unskilled persons (fuses
mainly for household and similar
applications)
2) 3)
IEC 60269-3-1 - Part 3-1: Supplementary requirements for HD 60269-3-1 2004
(mod) fuses for use by unskilled persons (fuses
mainly for household and similar
applications)
Sections I to IV: Examples of types of
standardized fuses
IEC 60309 Series Plugs, socket-outlets and couplers for EN 60309 Series
industrial purposes
IEC 60317 Series Specifications for particular types of winding EN 60317 Series
wires
IEC 60320 Series Appliance couplers for household and EN 60320 Series
similar general purposes
2) 3)
IEC 60320-2-3 - Part 2-3: Appliance coupler with a degree of EN 60320-2-3 1998
protection higher than IPX0
2) 3)
IEC 60384-14 - Fixed capacitors for use in electronic EN 60384-14 2005
equipment
Part 14: Sectional specification - Fixed
capacitors for electromagnetic interference
suppression and connection to the supply
mains
IEC 60417 data- Graphical symbols for use on equipment - -
base

The HD 21 series, which is related to, but not directly equivalent with the IEC 60227 series, applies instead.

The HD 22 series, which is related to, but not directly equivalent with the IEC 60245 series, applies instead.

---------------------- Page: 7 ----------------------
SIST EN 61558-1:2006
EN 61558-1:2005 - 6 -
Publication Year Title EN/HD Year
IEC 60449 1973 Voltage bands for electrical installations of HD 193 S2 1982
buildings
IEC 60454 Series Specifications for pressure-sensitive EN 60454 Series
adhesive tapes for electrical purposes
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993
IEC 60664-1 1992 Insulation coordination for equipment within EN 60664-1 2003
low-voltage systems
Part 1: Principles, requirements and tests
IEC 60664-3 2003 Part 3: Use of coating, potting or moulding EN 60664-3 2003
for protection against pollution
IEC 60691 2002 Thermal-links - Requirements and EN 60691 2003
application guide
2) 3)
IEC 60695-2-10 - Fire hazard testing EN 60695-2-10 2001
Part 2-10: Glowing/hot-wire based test
methods - Glow-wire apparatus and
common test procedure
IEC 60695-2-11 2000 Part 2-11: Glowing/hot-wire based test EN 60695-2-11 2001
methods - Glow-wire flammability test
method for end-products
2) 3)

IEC 60695-10-2 - Part 10-2: Abnormal heat - Ball pressure test EN 60695-10-2 2003

IEC 60730 Series Automatic electrical controls for household EN 60730 Series
(mod) and similar use
IEC 60730-1 1999 Automatic electrical controls for household EN 60730-1 2000
(mod) and similar use + A12 2003
Part 1: General requirements + A13 2004
+ A14 2005
IEC 60851-3 1996 Winding wires - Test methods EN 60851-3 1996
Part 3: Mechanical properties
IEC 60851-5 1996 Part 5: Electrical properties EN 60851-5 1996
IEC 60851-6 1996 Part 6: Thermal properties EN 60851-6 1996
IEC 60884-1 2002 Plugs and socket-outlets for household and - -
similar purposes
Part 1: General requirements
IEC 60884-2-4 - Part 2-4: Particular requirements for plugs - -
and socket-outlets for SELV
HD 193 S2 includes A1:1979 to IEC 60449:1973.
EN 60664-1:2003 includes A1:2000 + A2:2002 to IEC 60664-1:1992.
---------------------- Page: 8 ----------------------
SIST EN 61558-1:2006
- 7 - EN 61558-1:2005
Publication Year Title EN/HD Year
IEC 60898 Series Electrical accessories - Circuit-breakers for EN 60898 Series
(mod) overcurrent protection for household and
similar installations
IEC 60906-1 - IEC System of plugs and socket-outlets for - -
household and similar purposes
Part 1: Plugs and socket-outlets 16 A 250 V
a.c.
IEC 60906-3 - Part 3: SELV plugs and socket-outlets, 16 A - -
6V, 12 V, 24 V, 48 V, a.c. and d.c.
2) 3)
IEC 60947-7-1 - Low-voltage switchgear and controlgear EN 60947-7-1 2002
Part 7-1: Ancillary equipment - Terminal
blocks for copper conductors
IEC 60990 1990 Methods of measurement of touch-current - -
and protective conductor current
2) 3)
IEC 60998-2-1 - Connecting devices for low-voltage circuits EN 60998-2-1 2004
(mod) for household and similar purposes
Part 2-1: Particular requirements for
connecting devices as separate entities with
screw-type clamping units
2) 3)
IEC 60998-2-2 - Part 2-2: Particular requirements for EN 60998-2-2 2004
(mod) connecting devices as separate entities with
screwless-type clamping units
2) 3)
IEC 60999-1 - Connecting devices - Electrical copper EN 60999-1 2000
conductors - Safety requirements for screw-
type and screwless-type clamping units
Part 1: General requirements and particular
requirements for clamping units for
conductors from 0,2 mm² up to 35 m²
(included)
IEC 61032 1997 Protection of persons and equipment by EN 61032 1998
enclosures - Probes for verification
10)
IEC 61058-1 2000 Switches for appliances EN 61058-1 2002
(mod) Part 1: General requirements
2) 3)
IEC 61140 - Protection against electric shock - Common EN 61140 2002
aspects for installation and equipment
ISO 4046-4 2002 Paper, board, pulps and related terms - - -
Vocabulary
Part 4: Paper and board grades and
converted products
ISO 8820 Series Road vehicles – Fuse links - -

IEC 60990:1990 is superseded by IEC 60990:1999, which is harmonized as EN 60990:1999.

10)
EN 61058-1:2002 includes A1:2001 to IEC 61058-1:2000.
---------------------- Page: 9 ----------------------
SIST EN 61558-1:2006
---------------------- Page: 10 ----------------------
SIST EN 61558-1:2006
IEC 61558-1
Edition 2.0 2005-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of power transformers, power supplies, reactors and similar products –
Part 1: General requirements and tests
Sécurité des transformateurs, alimentations, bobines d'inductance et produits
analogues – Partie 1: Exigences générales et essais
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XH
ICS 29.180 ISBN 2-8318-8170-6
---------------------- Page: 11 ----------------------
SIST EN 61558-1:2006
61558-1 ¤ IEC:2005 – 3 – – 2 – 61558-1 © IEC:2005
CONTENTS

FOREWORD..........................................................................................................................5

INTRODUCTION....................................................................................................................8

1 Scope.............................................................................................................................11

2 Normative references......................................................................................................13

3 Terms and definitions .....................................................................................................16

4 General requirements .....................................................................................................29

5 General notes on tests....................................................................................................29

6 Ratings...........................................................................................................................31

7 Classification ..................................................................................................................31

8 Marking and other information.........................................................................................33

9 Protection against electric shock.....................................................................................38

10 Change of input voltage setting .......................................................................................41

11 Output voltage and output current under load ..................................................................42

12 No-load output voltage....................................................................................................42

13 Short-circuit voltage........................................................................................................43

14 Heating...........................................................................................................................43

15 Short circuit and overload protection ...............................................................................48

16 Mechanical strength.......................................................................................................52

17 Protection against harmful ingress of dust, solid objects and moisture............................55

18 Insulation resistance, dielectric strength and leakage current ........................................ . 59

19 Construction ..................................................................................................................63

20 Components ................................................................................................................. . 7 0

21 Internal wiring ................................................................................................................76

22 Supply connection and other external flexible cables or cords.........................................76

23 Terminals for external conductors ..................................................................................82

24 Provisions for protective earthing ...................................................................................84

25 Screws and connections ................................................................................................85

26 Creepage distances, clearances and distances through insulation ..................................88

27 Resistance to heat, fire and tracking ..............................................................................97

28 Resistance to rusting .................................................................................................... 1 0 1

Annex A (normative) Measurement of creepage distances and clearances.......................... 1 0 9

Annex B (normative) Testing a series of transformers.........................................................113

Annex C (normative) Creepage distances (cr), clearances (cl) and distances through

insulation (dti) Material group II (400 ≤CTI <600) .................................................................115

Annex D (normative) Creepage distances (cr), clearances (cl) and distances through

insulation (dti) Material group I (CTI ≥600) ...........................................................................118

Annex E (normative) Glow-wire test....................................................................................121

Annex F (normative) Requirements for manually operated switches which are parts of

transformers assembly........................................................................................................122

---------------------- Page: 12 ----------------------
SIST EN 61558-1:2006
61558-1 © IEC:200561558-1 ¤ IEC:2005 – 5 – – 3 –

Annex G (normative) Tracking test .....................................................................................125

Annex H (normative) Electronic circuits ..............................................................................126

Annex I (void)...................................................................................................................... 1 3 0

Annex J (normative) Measuring network for touch-currents.................................................131

Annex K (normative) Insulated winding wires for use as multiple layer insulation................. 1 3 2

Annex L (normative) Routine tests (production tests) ..........................................................134

Annex M (informative) Examples to be used as a guide for 19.1 .........................................136

Annex N (informative) Examples of points of application of test voltages.............................139

Annex O (void) ....................................................................................................................141

Annex P (informative) Examples of points of measurement of creepage distances and

clearances ..........................................................................................................................142

Annex Q (informative) Explanation of IP numbers for degrees of protection ........................144

Annex R (normative) Explanations of the application of 4.1.1.2.1 of IEC 60664-1 (see

26.2) ...................................................................................................................................146

Annex S (void) ....................................................................................................................147

Annex T (void) ....................................................................................................................148

Annex U (informative) Optional t –marking of transformers.................................................149

Annex V (informative) Symbols to be used for thermal cut-outs...........................................158

Annex W (normative) Coated printed circuit boards ............................................................159

Bibliography ........................................................................................................................160

Index of defined terms.........................................................................................................161

Figure 0 – IEC 61558 principle ...............................................................................................9

Figure 1 – Mounting box for flush-type transformer (see 5.10) ............................................. 1 0 2

Figure 2 – Standard test finger (see 9.1.2, 15.5.2 and IEC 61032, test probe B)...................103

Figure 3 – Test pin (see 9.2 and IEC 61032, test probe 13) .................................................104

Figure 4 – Abrasion resistance test for insulating coated layers ........................................... 1 0 4

Figure 5 – Ball-pressure apparatus (see 27.1) .....................................................................105

Figure 6 – Test arrangement for checking mechanical withstanding of insulating

materials in thin sheet layers (see 26.3) ..............................................................................106

Figure 7 – Flexing test apparatus (see 22.9.4) .....................................................................107

Figure 8 – Test configuration: single-phase equipment on star TN or TT system ..................108

Figure H.1 – Example of an electronic circuit with low-power points (see H.2.2) ................... 1 2 9

Figure J.1 – Measuring network for touch-current ................................................................ 1 3 1

Figure U.1 – Relation between winding temperature and endurance test duration.................156

Figure U.2 – Assessment of claimed value of S ...................................................................157

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SIST EN 61558-1:2006
61558-1 ¤ IEC:2005 – 7 – – 4 – 61558-1 © IEC:2005

Table 1 – Values of maximum temperatures in normal use ....................................................45

Table 2 – Test temperature and testing time (in days) per cycle.............................................47

Table 3 – Maximum values of temperatures under short-circuit or overload conditions ...........49

Table 4 – Values of T and k for fuses ....................................................................................50

Table 5 – Pull force on pins ................................................................................................. . 5 4

Table 6 – Solid-object-proof transformer test ....................................................................... . 5 6

Table 7 – Values of insulation resistance..............................................................................59

Table 8a – Table of dielectric strength test voltages .............................................................60

Table 8b – Limits for currents...............................................................................................63

Table 9 – Nominal cross-sectional areas of external flexible cables or cords.........................78

Table 10 – Pull and torque to be applied to external flexible cables or cords fixed to

stationary and portable transformers ....................................................................................81

Table 11 – Torque to be applied to screws and connections................................................. . 8 6

Table 12 – Torque test on glands .........................................................................................88

Table 13 – Creepage distances (cr), clearances (cl) and distances through insulation

(dti) – Material group IIIa (175 ≤ CTI < 400) ..........................................................................94

Table C.1 – Creepage distances (cr), clearances (cl) and distances through insulation

(dti) – Material group II (400 ≤CTI <600) .............................................................................. 1 1 5

Table D.1 – Creepage distances (cr), clearances (cl) and distances through insulation

(dti) – Material group I (CTI ≥600)........................................................................................118

Table F.1 – Peak surge current of the additional load ..........................................................123

Table Q.1 – Degrees of protection indicated by the first characteristic numeral ....................144

Table Q.2 – Degrees of protection indicated by the second characteristic numeral ...............145

Table R.1 – Impulse test voltage according to 4.1.1.2.1 of IEC 60664-1 ............................... 1 4 6

Table U.1 – Example of maximum temperatures of windings under short circuit or

overload conditions and at 110 % of rated voltage for transformers subjected to an

endurance test duration of 30 days and a life expectance of 10 years ..................................151

Table U.2 –Theoretical test temperatures for transformers subjected to an endurance

test duration of 30 days and a life expectancy of 10 years.................................................... 1 5 3

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SIST EN 61558-1:2006
61558-1 © IEC:200561558-1 ¤ IEC:2005 – 9 – – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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SAFETY OF POWER TRANSFORMERS, POWER SUPPLIES,
REACTORS AND SIMILAR PRODUCTS –
Part 1: General requirements and tests
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

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