Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

IEC 61558-1:2017 is also available as IEC 61558-1:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61558-1:2017 deals with safety aspects of transformers, reactors, power supply units and combinations thereof such as electrical, thermal and mechanical safety. This document covers the following independent or associated stationary or portable types of dry-type transformers, power supply units, including switch mode power supply units, reactors and combinations thereof in the field of safety. The windings can be encapsulated or non-encapsulated. They are not forming a part of the distribution network. This third edition cancels and replaces the second edition published in 2005 and Amendment 1:2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a. fully insulated winding wires (FIW), new tables and aging tests for FIW constructions,
b. overvoltage categories 1, 2, 3 and 4 for clearances and dielectric strength tests (new tables) are included,
c. development of new symbols for the different overvoltage categories,
d. symbol for maximum altitudes, if higher than 2 000 m,
e. symbol for plug in power supply units, if the pins are damaged (tumbling barrel test),
f. symbol for minimum temperature (even during the transportation),
g. alternative temperature measurement, simulated load and back to back method according to IEC 60076-11,
h. short circuit and overload protection, simulated load and back to back method according to IEC 60076-11,
i. adjustment of temperatures in Table 2 according to CENELEC Guide 29,
j. establishing partial discharge test above 750 V for FIW constructions,
k. requirements for toroidal core constructions, division for basic and for supplementary isolation,
l. modification of protection indexes for enclosures (IP-code),
m. dimensioning of rectangular cross section connectors for transformers,
n. repetition test, 80% of required dielectric strength test voltage of Table 14,a.
o. vibration test for vehicles and railway applications,
p. two Y1 Capacitors for working voltages above 250 V and not exceeding 500 V with overvoltage category 3.
It has the status of a group safety publication in accordance with IEC Guide 104.

Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 1: Exigences générales et essais

IEC 61558-1:2017 est disponible sous forme de IEC 61558-1:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 61558-1:2017 traite des aspects relatifs à la sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des combinaisons de ces éléments, tels que la sécurité électrique, la sécurité thermique et la sécurité mécanique. Le présent document couvre les transformateurs de type sec, les blocs d’alimentation, y compris les blocs d’alimentation à découpage, les bobines d’inductance et les combinaisons de ces éléments, de type indépendant ou associé, fixe ou mobile, dans le domaine de la sécurité. Les enroulements peuvent être enrobés ou non enrobés. Ils ne constituent pas une partie du réseau de distribution. Cette troisième édition annule et remplace la deuxième édition parue en 2005 et l’Amendement 1:2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a. fils de bobinage totalement isolés (FIW), nouveaux tableaux et essais de vieillissement pour les constructions avec fils FIW,
b. les catégories de surtensions 1, 2, 3 et 4 pour les distances d’isolement et les essais de rigidité diélectrique (nouveaux tableaux) sont incluses,
c. développement de nouveaux symboles pour les différentes catégories de surtensions,
d. symbole pour les altitudes maximales, si elles sont supérieures à 2 000 m,
e. symbole pour les blocs d’alimentation enfichables, si les broches sont endommagées (essai au tambour tournant),
f. symbole pour la température minimale (même durant le transport),
g. variante de mesure de la température, méthode de charge simulée et d’essai en opposition conformément à l’IEC 60076-11,
h. protection contre les courts-circuits et les surcharges, méthode de charge simulée et d’essai en opposition conformément à l’IEC 60076-11,
i. ajustement des températures dans le Tableau 2 conformément au Guide CENELEC 29,
j. établissement de l’essai de décharge partielle au-dessus de 750 V pour les constructions avec fils FIW,
k. exigences pour noyaux toroïdaux, division pour l’isolation principale et pour l’isolation supplémentaire,
l. modification des indices de protection pour les enveloppes (code IP),
m. dimensionnement des connecteurs de section rectangulaire pour transformateurs,
n. essai de répétition, 80 % de la tension d’essai de rigidité diélectrique requise dans le Tableau 14,
o. essai de vibrations pour les véhicules et les applications ferroviaires,
p. deux condensateurs Y1 pour des tensions locales supérieures à 250 V et ne dépassant pas 500 V avec la catégorie de surtension 3.
Elle a le statut d'une publication groupée de sécurité conformément au Guide IEC 104.

General Information

Status
Published
Publication Date
28-Sep-2017
Current Stage
PPUB - Publication issued
Start Date
29-Sep-2017
Completion Date
29-Sep-2017
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IEC 61558-1
Edition 3.0 2017-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –
Part 1: General requirements and tests
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et
des combinaisons de ces éléments –
Partie 1: Exigences générales et essais
IEC 61558-1:2017-09(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 61558-1
Edition 3.0 2017-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –
Part 1: General requirements and tests
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et
des combinaisons de ces éléments –
Partie 1: Exigences générales et essais
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-4750-1

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 61558-1:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 9

INTRODUCTION ................................................................................................................... 11

1 Scope ............................................................................................................................ 14

2 Normative references .................................................................................................... 16

3 Terms and definitions .................................................................................................... 19

3.1 Transformers ........................................................................................................ 20

3.2 General terms ....................................................................................................... 23

3.3 Operations and protections ................................................................................... 24

3.4 Circuits and windings ............................................................................................ 26

3.5 Ratings ................................................................................................................. 27

3.6 No-load values ...................................................................................................... 29

3.7 Insulation .............................................................................................................. 29

3.8 Touch current and protective earthing conductor current ....................................... 33

4 General requirements .................................................................................................... 33

5 General notes on tests .................................................................................................. 34

6 Ratings .......................................................................................................................... 36

7 Classification ................................................................................................................. 36

8 Marking and other information ....................................................................................... 37

9 Protection against electric shock ................................................................................... 43

9.1 General ................................................................................................................. 43

9.2 Protection against contact with hazardous-live-parts ............................................. 44

9.2.1 Determination of hazardous-live-parts ........................................................... 44

9.2.2 Accessibility to hazardous-live-parts .............................................................. 44

9.2.3 Accessibility to non hazardous-live-part ......................................................... 47

9.3 Protection against hazardous electrical discharge ................................................. 47

10 Change of input voltage setting ..................................................................................... 47

11 Output voltage and output current under load ................................................................ 48

12 No-load output voltage .................................................................................................. 49

13 Short-circuit voltage ....................................................................................................... 49

14 Heating .......................................................................................................................... 49

14.1 General requirements ........................................................................................... 49

14.1.1 Temperature-rise test .................................................................................... 49

14.1.2 Alternative temperature-rise test .................................................................... 51

14.1.3 Determination of steady-state conditions ....................................................... 54

14.2 Application of 14.1 or 14.3 according to the insulation system............................... 55

14.3 Accelerated ageing test for undeclared class of insulation system ........................ 56

14.3.1 General ......................................................................................................... 56

14.3.2 Heat run ........................................................................................................ 56

14.3.3 Vibration ........................................................................................................ 57

14.3.4 Moisture treatment ......................................................................................... 57

14.3.5 Measurements ............................................................................................... 57

15 Short circuit and overload protection.............................................................................. 57

15.1 General requirements ........................................................................................... 57

15.1.1 Short circuit and overload test method ........................................................... 57

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IEC 61558-1:2017 © IEC 2017 – 3 –

15.1.2 Alternative short circuit and overload test method .......................................... 60

15.2 Inherently short-circuit proof transformers ............................................................. 60

15.3 Non-inherently short-circuit proof transformers...................................................... 60

15.4 Non-short-circuit proof transformers ...................................................................... 61

15.5 Fail-safe transformers ........................................................................................... 61

16 Mechanical strength ...................................................................................................... 62

16.1 General ................................................................................................................. 62

16.2 Stationary transformers ......................................................................................... 62

16.3 Portable transformers (except portable transformers with integral pins for

introduction in socket-outlet in the fixed wiring) ..................................................... 63

16.4 Portable transformers provided with integral pins for introduction in socket-

outlets of the fixed wiring ...................................................................................... 63

16.4.1 General requirements .................................................................................... 63

16.4.2 Portable transformers provided with integral pins according to EN
50075 (IEC plug type C) for introduction in socket-outlets of the fixed

wiring ............................................................................................................ 64

16.5 Additional requirements for transformers to be used in vehicles and railway

applications .......................................................................................................... 65

16.5.1 Transformers to be used in vehicles and railway applications ........................ 65

16.5.2 Test requirements for the transportation of transformers ................................ 66

17 Protection against harmful ingress of dust, solid objects and moisture ........................... 67

17.1 Degrees of protection provided by enclosures (IP code) ........................................ 67

17.1.1 General requirements .................................................................................... 67

17.1.2 Tests on transformers with enclosure ............................................................ 68

17.2 Humidity treatment ................................................................................................ 70

18 Insulation resistance, dielectric strength and leakage current ........................................ 71

18.1 General ................................................................................................................. 71

18.2 Insulation resistance ............................................................................................. 71

18.3 Dielectric strength test .......................................................................................... 72

18.4 Insulation between and within windings ................................................................. 74

18.5 Touch current and protective earthing conductor current ....................................... 74

18.5.1 General ......................................................................................................... 74

18.5.2 Touch current ................................................................................................ 75

18.5.3 Protective earthing conductor current ............................................................ 76

19 Construction .................................................................................................................. 77

19.1 General construction ............................................................................................. 77

19.1.1 General ......................................................................................................... 77

19.1.2 Auto-transformers .......................................................................................... 77

19.1.3 Separating transformers ................................................................................ 78

19.1.4 Isolating transformers and safety isolating transformers ................................ 79

19.2 Flammability of materials ...................................................................................... 81

19.3 Short-circuit characteristics of portable transformers ............................................. 81

19.4 Class II transformer contact prevention of accessible conductive parts ................. 81

19.5 Class II transformer insulation reassembling after service ..................................... 81

19.6 Loosening of wires, screws or similar parts ........................................................... 82

19.7 Resistor or capacitor connection with accessible conductive parts ........................ 82

19.8 Bridging of separated conductive parts by resistors or capacitors ......................... 82

19.9 Insulating material separating input and output windings ....................................... 83

19.10 Accidental contact protection against hazardous-live-parts provided by

isolating coating .................................................................................................... 83

---------------------- Page: 5 ----------------------
– 4 – IEC 61558-1:2017 © IEC 2017

19.11 Insulating material of handles, operating levers, knobs and similar parts............... 84

19.12 Winding construction ............................................................................................. 84

19.13 Fixing of handles, operating levers and similar parts ............................................. 88

19.14 Fixing of covers providing protection against electric shock .................................. 88

19.15 Strain on fixed socket-outlets caused by pin-transformers connection ................... 89

19.16 Portable transformers for use in irregular or harsh conditions ............................... 89

19.17 Drain hole of transformers protected against ingress of water ............................... 89

19.18 Plug connected transformers protected against ingress of water ........................... 89

19.19 Flexible cable or flexible cord connection for class I portable transformers ........... 89

19.20 SELV- and PELV-circuit separation of live parts .................................................... 89

19.21 Protection against contact for FELV-circuit............................................................ 90

19.22 Protective earthing regarding class II transformers ............................................... 90

19.23 Protective earthing regarding class III transformers .............................................. 91

20 Components .................................................................................................................. 91

21 Internal wiring ................................................................................................................ 96

22 Supply connection and other external flexible cables or cords ....................................... 96

23 Terminals for external conductors ................................................................................ 103

24 Provisions for protective earthing................................................................................. 104

25 Screws and connections .............................................................................................. 106

26 Creepage distances, clearances and distances through insulation ............................... 108

26.1 General ............................................................................................................... 108

26.2 Creepage distances and clearances .................................................................... 109

26.2.1 General ....................................................................................................... 109

26.2.2 Windings covered with adhesive tape .......................................................... 109

26.2.3 Uncemented insulationing parts ................................................................... 109

26.2.4 Cemented insulating parts ........................................................................... 109

26.2.5 Enclosed parts (e.g. by impregnation or potting) .......................................... 110

26.3 Distance through insulation ................................................................................. 111

27 Resistance to heat, fire and tracking ............................................................................ 122

27.1 General ............................................................................................................... 122

27.2 Resistance to heat .............................................................................................. 122

27.2.1 General ....................................................................................................... 122

27.2.2 External accessible parts ............................................................................. 122

27.2.3 Internal parts ............................................................................................... 123

27.3 Resistance to abnormal heat under fault conditions ............................................ 123

27.4 Resistance to fire ................................................................................................ 124

27.4.1 General ....................................................................................................... 124

27.4.2 External accessible parts ............................................................................. 125

27.4.3 Internal parts ............................................................................................... 125

27.5 Resistance to tracking ......................................................................................... 126

28 Resistance to rusting ................................................................................................... 126

Annex A (normative) Measurement of creepage distances and clearances......................... 127

Annex B (normative) Testing a series of transformers ........................................................ 131

B.1 General ............................................................................................................... 131

B.2 Requirements ..................................................................................................... 131

B.3 Constructional inspection .................................................................................... 132

Annex C (void) .................................................................................................................... 133

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IEC 61558-1:2017 © IEC 2017 – 5 –

Annex D (void) .................................................................................................................... 134

Annex E (normative) Glow-wire test ................................................................................... 135

E.1 General ............................................................................................................... 135

E.2 Severity .............................................................................................................. 135

E.3 Conditioning ........................................................................................................ 135

E.4 Test procedure .................................................................................................... 135

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

transformers assembly ........................................................................................................ 136

F.1 General ............................................................................................................... 136

F.2 Switches tested as a separate component .......................................................... 136

F.3 Switches tested as part of the transformer .......................................................... 136

Annex G (normative) Tracking test ..................................................................................... 139

G.1 General ............................................................................................................... 139

G.2 Test specimen .................................................................................................... 139

G.3 Test apparatus .................................................................................................... 139

G.4 Procedure ........................................................................................................... 139

Annex H (normative) Electronic circuits .............................................................................. 140

H.1 General ............................................................................................................... 140

H.2 General notes on tests (addition to Clause 5)...................................................... 140

H.3 Short circuit and overload protection (addition to Clause 15) ............................... 140

H.4 Creepage distances, clearances and distances through insulation (addition

to Clause 26) ...................................................................................................... 142

Annex I (informative) Dimensions for rectangular cross-section connectors of

transformers, basic dimensions and coordination ................................................................ 144

Annex J (normative) Measuring network for touch-currents ................................................ 146

Annex K (normative) Insulated winding wires ..................................................................... 147

K.1 General ............................................................................................................... 147

K.2 Type tests ........................................................................................................... 147

K.2.1 General ....................................................................................................... 147

K.2.2 Dielectric strength test ................................................................................. 147

K.2.3 Flexibility and adherence ............................................................................. 147

K.2.4 Heat shock .................................................................................................. 148

K.2.5 Retention of dielectric strength after bending ............................................... 148

K.3 Testing during manufacturing .............................................................................. 149

K.3.1 General ....................................................................................................... 149

K.3.2 Routine test ................................................................................................. 149

K.3.3 Sampling test ............................................................................................... 149

Annex L (normative) Routine tests (production tests) ......................................................... 150

L.1 General ............................................................................................................... 150

L.2 Protective earthing continuity test ....................................................................... 150

L.3 Checking of no-load output voltage ..................................................................... 150

L.4 Dielectric strength test ........................................................................................ 150

L.5 Checking of protective devices mounting ............................................................ 151

L.6 Visual inspection ................................................................................................. 151

L.7 Repetition test after routine dielectric strength test ............................................. 151

Annex M (informative) Examples to be used as a guide for 19.1 ........................................ 152

M.1 General ............................................................................................................... 152

M.2 Coil-former .......................................................................................................... 152

---------------------- Page: 7 ----------------------
– 6 – IEC 61558-1:2017 © IEC 2017

M.2.1 Concentric type ........................................................................................... 152

M.2.2 Side-by-side type ......................................................................................... 153

M.3 Windings ............................................................................................................. 153

M.3.1 Without screen .............................................................................

...

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