Safety requirements for power electronic converter systems and equipment - Part 2: Power electronic converters from 1 000 V AC or 1 500 V DC up to 36 kV AC or 54 kV DC

IEC 62477-2:2018 applies to power electronic converter systems (PECS) and equipment, their components for electronic power conversion and electronic power switching, including the means for their control, protection, monitoring and measurement, such as with the main purpose of converting electric power, with rated system voltages from 1 000 V AC or 1 500 V DC up to 36 kV AC or 54 kV DC.
This document can also be used as a reference standard for product committees producing product standards for
adjustable speed electric power drive systems (PDS),
standalone uninterruptible power systems (UPS), and
stabilized DC power supplies.  
For PECS for which no product standard exists, this document provides minimum requirements for safety aspects.  
This document has the status of a group safety publication in accordance with IEC Guide 104 for power electronic converter systems and equipment for solar, wind, tidal, wave, fuel cell or similar energy sources.
According to IEC Guide 104, one of the responsibilities of technical committees is, wherever applicable, to make use of basic safety publications and/or group safety publications in the preparation of their product standards.
This document
establishes a common terminology for safety aspects relating to PECS and equipment,
establishes minimum requirements for the coordination of safety aspects of interrelated parts within a PECS,
establishes a common basis for minimum safety requirements for the PEC portion of products that contain PEC,
specifies requirements to reduce risks of fire, electric shock, thermal, energy and mechanical hazards, during use and operation and, where specifically stated, during service and maintenance,
specifies minimum requirements to reduce risks with respect to pluggable and permanently connected equipment, whether it consists of a system of interconnected units or independent units, subject to installing, operating and maintaining the equipment in the manner prescribed by the manufacturer,
establishes an arc fault rating label requirement with testing instructions for PEC and PECS, and
covers power electronic converters and systems in open type design, which are catalog (pre-defined commercially available) power electronic converters and systems or engineered solutions from same.  
This document does not cover
telecommunications apparatus other than power supplies to such apparatus,
functional safety aspects as covered by, for example, IEC 61508 (all parts),
electrical equipment and systems for railways applications and electric vehicles, and
power electronic converters and systems in open type design, which are – in their major part – dimensioned, designed and constructed according to the user’s individual requirements and specifications and follow power installation standards, for example IEC 61936-1.

Exigences de sécurité applicables aux systèmes et matériels électroniques de conversion de puissance – Partie 2: Convertisseurs électroniques de puissance entre 1 000 V en courant alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif ou 54 kV en courant continu

L'IEC 62477-2:2018 s'applique aux matériels et aux systèmes électroniques de conversion de puissance (SECP), à leurs composants pour la conversion de puissance électronique et la commande (ouverture et fermeture) électronique de puissance, y compris les moyens de commande, de protection, de surveillance et de mesure, ayant pour principale fonction la conversion de puissance électrique, d'une tension système assignée entre 1 000 V en courant alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif ou 54 kV en courant continu.
Le présent document peut également être utilisé comme norme de référence par les comités de produits qui élaborent des normes de produits applicables aux
systèmes d'entraînement électrique de puissance à vitesse variable,
alimentations sans interruption (ASI) autonomes, et
alimentations stabilisées en courant continu.  
Pour les SECP pour lesquels il n'existe pas de norme de produit, le présent document spécifie des exigences minimales pour les aspects de sécurité.
La présente document a le statut d’une publication groupée de sécurité conformément au Guide 104 de l'IEC applicable aux systèmes électroniques de conversion de puissance et équipements pour énergie solaire, éolienne, des marées, des vagues, des piles à combustible ou sources d’énergie analogues.
Conformément au Guide 104 de l'IEC, il incombe aux comités d'études d'utiliser, dans toute la mesure du possible, les publications fondamentales de sécurité et/ou les publications groupées de sécurité pour l'élaboration de leurs normes de produits.
Le présent document
établit une terminologie commune applicable aux aspects de sécurité concernant les matériels et les SECP,
établit les exigences minimales pour la coordination des aspects de sécurité des parties interconnectées au sein d'un SECP,
établit une base commune applicable aux exigences minimales de sécurité de la partie du convertisseur électronique de puissance (CEP) des produits comprenant un CEP,
spécifie des exigences permettant de réduire les risques d'incendie et de choc électrique ainsi que les dangers thermiques, mécaniques et dus à l'énergie électrique, en cours d'utilisation et de fonctionnement et, lorsque cela est spécifiquement indiqué, au cours des opérations d'entretien et de maintenance,
spécifie les exigences minimales permettant de réduire ces types de risques concernant les matériels enfichables et connectés en permanence, qu'ils soient constitués d'un système d'unités interconnectées ou d'unités indépendantes, faisant l'objet d'opérations d'installation, de fonctionnement et d'entretien du matériel tel que spécifié par le constructeur,
établit les exigences en matière de marquage de caractéristiques assignées de défaut d'arc avec des instructions d'essai pour les CEP et SECP, et
couvre les convertisseurs et systèmes électroniques de puissance de type ouvert, qui sont des convertisseurs et systèmes électroniques de puissance de catalogue (prédéfinis comme étant disponibles sur le marché) ou des solutions techniques de catalogue.  
Le présent document ne couvre pas
les appareils de télécommunications autres que les alimentations pour ce type d'appareil,
les aspects de sécurité fonctionnelle tels que traités, par exemple, par l'IEC 61508 (toutes les parties),
les matériels et systèmes électriques utilisés dans les applications ferroviaires et les véhicules électriques, et
les convertisseurs et systèmes électroniques de puissance de type ouvert qui sont, pour la plupart, dimensionnés, conçus et fabriqués selon les exigences et spécifications individuelles de l'utilisateur et qui fournissent des normes d'installation de puissance, par exemple l'IEC 61936-1.

General Information

Status
Published
Publication Date
20-Jun-2018
Current Stage
PPUB - Publication issued
Completion Date
21-Jun-2018
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IEC 62477-2:2018 - Safety requirements for power electronic converter systems and equipment - Part 2: Power electronic converters from 1 000 V AC or 1 500 V DC up to 36 kV AC or 54 kV DC
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IEC 62477-2
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety requirements for power electronic converter systems and equipment –
Part 2: Power electronic converters from 1 000 V AC or 1 500 V DC up to 36 kV
AC or 54 kV DC
Exigences de sécurité applicables aux systèmes et matériels électroniques de
conversion de puissance –
Partie 2: Convertisseurs électroniques de puissance entre 1 000 V en courant
alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif ou 54 kV
en courant continu
IEC 62477-2:2018-06(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 62477-2
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety requirements for power electronic converter systems and equipment –
Part 2: Power electronic converters from 1 000 V AC or 1 500 V DC up to 36 kV
AC or 54 kV DC
Exigences de sécurité applicables aux systèmes et matériels électroniques de
conversion de puissance –
Partie 2: Convertisseurs électroniques de puissance entre 1 000 V en courant
alternatif ou 1 500 V en courant continu et 36 kV en courant alternatif ou 54 kV
en courant continu
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-5787-6

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 62477-2:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 7

INTRODUCTION ..................................................................................................................... 9

1 Scope ............................................................................................................................ 10

2 Normative references .................................................................................................... 11

3 Terms and definitions .................................................................................................... 11

4 Protection against hazards ............................................................................................ 12

4.1 General ................................................................................................................. 12

4.2 Fault and abnormal conditions .............................................................................. 13

4.3 Short-circuit and overload protection ..................................................................... 14

4.3.1 General ......................................................................................................... 14

4.3.2 Specification of input short-circuit withstand strength and output short-

circuit current ability ...................................................................................... 14

4.3.3 Short-circuit coordination (backup protection) ................................................ 14

4.3.4 Protection by several devices ........................................................................ 14

4.3.5 Input ports short time withstand current, I .................................................. 14

4.4 Protection against electric shock ........................................................................... 14

4.4.1 General ......................................................................................................... 14

4.4.2 Decisive voltage class ................................................................................... 15

4.4.3 Provision for basic protection ......................................................................... 16

4.4.4 Provision for fault protection .......................................................................... 17

4.4.5 Enhanced protection ...................................................................................... 18

4.4.6 Protective measures ...................................................................................... 18

4.4.7 Insulation ....................................................................................................... 19

4.4.8 Compatibility with residual current-operated protective devices (RCD) ........... 24

4.4.9 Capacitor discharge ....................................................................................... 24

4.5 Protection against electrical energy hazards ......................................................... 26

4.5.1 Operator access areas................................................................................... 26

4.5.2 Service access areas ..................................................................................... 28

4.6 Protection against fire and thermal hazards .......................................................... 28

4.6.1 Circuits representing a fire hazard ................................................................. 28

4.6.2 Components representing a fire hazard ......................................................... 28

4.6.3 Fire enclosures .............................................................................................. 28

4.6.4 Temperature limits ......................................................................................... 29

4.6.5 Limited power sources ................................................................................... 29

4.7 Protection against mechanical hazards ................................................................. 29

4.7.1 General ......................................................................................................... 29

4.7.2 Specific requirements for liquid cooled PECS ................................................ 29

4.8 Equipment with multiple sources of supply ............................................................ 30

4.9 Protection against environmental stresses ............................................................ 30

4.10 Protection against sonic pressure hazards ............................................................ 30

4.10.1 General ......................................................................................................... 30

4.10.2 Sonic pressure and sound level ..................................................................... 31

4.11 Wiring and connections ......................................................................................... 31

4.11.1 General ......................................................................................................... 31

4.11.2 Routing .......................................................................................................... 31

4.11.3 Colour coding ................................................................................................ 31

4.11.4 Splices and connections ................................................................................ 31

---------------------- Page: 4 ----------------------
IEC 62477-2:2018 © IEC 2018 – 3 –

4.11.5 Accessible connections ................................................................................. 31

4.11.6 Interconnections between parts of the PECS ................................................. 31

4.11.7 Supply connections........................................................................................ 31

4.11.8 Terminals ...................................................................................................... 31

4.12 Enclosures ............................................................................................................ 31

4.12.1 General ......................................................................................................... 31

4.12.2 Handles and manual controls ......................................................................... 32

4.12.3 Cast metal ..................................................................................................... 32

4.12.4 Sheet metal ................................................................................................... 32

4.12.5 Stability test for enclosure ............................................................................. 32

5 Test requirements .......................................................................................................... 32

5.1 General ................................................................................................................. 32

5.1.1 Test objectives and classification ................................................................... 32

5.1.2 Selection of test samples ............................................................................... 33

5.1.3 Sequence of tests .......................................................................................... 33

5.1.4 Earthing conditions ........................................................................................ 33

5.1.5 General conditions for tests ........................................................................... 33

5.1.6 Compliance ................................................................................................... 33

5.1.7 Test overview ................................................................................................ 33

5.2 Test specifications ................................................................................................ 33

5.2.1 Visual inspections (type test, sample test and routine test) ............................ 33

5.2.2 Mechanical tests ............................................................................................ 34

5.2.3 Electrical tests ............................................................................................... 35

5.2.4 Abnormal operation and simulated faults tests ............................................... 38

5.2.5 Material tests ................................................................................................. 42

5.2.6 Environmental tests (type tests) ..................................................................... 42

5.2.7 Hydrostatic pressure test (type test and routine test) ..................................... 43

6 Information and marking requirements ........................................................................... 43

6.1 General ................................................................................................................. 43

6.2 Information for selection ....................................................................................... 43

6.3 Information for installation and commissioning ...................................................... 43

6.3.1 General ......................................................................................................... 43

6.3.2 Mechanical considerations ............................................................................. 43

6.3.3 Environment .................................................................................................. 43

6.3.4 Handling and mounting .................................................................................. 43

6.3.5 Enclosure temperature................................................................................... 43

6.3.6 Connections .................................................................................................. 43

6.3.7 Protection requirements ................................................................................. 44

6.3.8 Commissioning .............................................................................................. 45

6.4 Information for use ................................................................................................ 45

6.4.1 General ......................................................................................................... 45

6.4.2 Adjustment .................................................................................................... 45

6.4.3 Labels, signs and signals ............................................................................... 45

6.5 Information for maintenance .................................................................................. 45

6.5.1 General ......................................................................................................... 45

6.5.2 Capacitor discharge ....................................................................................... 45

6.5.3 Auto restart/bypass connection ...................................................................... 45

6.5.4 Other hazards ................................................................................................ 46

6.5.5 Equipment with multiple sources of supply ..................................................... 46

---------------------- Page: 5 ----------------------
– 4 – IEC 62477-2:2018 © IEC 2018

Annex A (normative) Additional information for protection against electric shock ................. 47

A.1 General ................................................................................................................. 47

A.2 Protection by means of DVC As ............................................................................ 47

A.3 Protection by means of protective impedance ....................................................... 47

A.4 Protection by using limited voltages ...................................................................... 47

A.5 Evaluation of working voltage and selection of DVC for touch voltage, PELV

and SELV circuits ................................................................................................. 47

A.6 Evaluation of the working voltage of circuits .......................................................... 47

A.7 Examples of the use of elements of protective measures ...................................... 47

Annex B (informative) Considerations for the reduction of the pollution degree .................... 49

Annex C (informative) Symbols referred to in IEC 62477-1 .................................................. 50

Annex D (normative) Evaluation of clearance and creepage distances ................................. 51

Annex E (informative) Altitude correction for clearances ...................................................... 52

Annex F (normative) Clearance and creepage distance determination for frequencies

greater than 30 kHz .............................................................................................................. 53

Annex G (informative) Cross-sections of round conductors .................................................. 54

Annex H (informative) Guidelines for RCD compatibility ....................................................... 55

H.1 Selection of RCD type ........................................................................................... 55

Annex I (informative) Examples of overvoltage category reduction ....................................... 56

Annex J (informative) Burn thresholds for touchable surfaces .............................................. 57

Annex K (informative) Table of electrochemical potentials ................................................... 58

Annex L (informative) Measuring instrument for touch current measurements ...................... 59

L.1 Measuring instrument............................................................................................ 59

Annex M (informative) Test probes for determining access .................................................. 60

Annex N (informative) Guidance regarding short-circuit current............................................ 61

Annex AA (normative) Arc fault test and labelling requirements ........................................... 62

AA.1 Overview............................................................................................................... 62

AA.2 References ........................................................................................................... 62

AA.3 Terms and definitions ............................................................................................ 62

AA.4 Ratings ................................................................................................................. 65

AA.4.1 General ......................................................................................................... 65

AA.4.2 Internal arc classification ............................................................................... 65

AA.5 Testing ................................................................................................................. 70

AA.5.1 General ......................................................................................................... 70

AA.5.2 Test preparation ............................................................................................ 71

AA.5.3 Test conditions .............................................................................................. 77

AA.5.4 Assessment ................................................................................................... 86

AA.6 Arc-prohibiting design ........................................................................................... 89

AA.6.1 General ......................................................................................................... 89

AA.6.2 Requirements ................................................................................................ 90

AA.6.3 Testing .......................................................................................................... 91

AA.7 Information and marking requirements .................................................................. 92

AA.7.1 General ......................................................................................................... 92

AA.7.2 IAC rating plate ............................................................................................. 93

AA.7.3 Information in manuals .................................................................................. 94

AA.7.4 Product marking – Internal protection ............................................................ 96

AA.8 Internal arc classification concepts ....................................................................... 96

---------------------- Page: 6 ----------------------
IEC 62477-2:2018 © IEC 2018 – 5 –

AA.8.1 General ......................................................................................................... 96

AA.8.2 Discription of risk and selection of equipment ................................................ 98

AA.8.3 Causes and preventative measures ............................................................... 98

AA.8.4 Protection ...................................................................................................... 99

AA.8.5 Considerations for selection and installation ................................................ 100

AA.8.6 Requirements for concepts 5 and 6.............................................................. 101

AA.8.7 Installation of PECS with general public access ........................................... 101

Bibliography ........................................................................................................................ 103

Figure AA.1 – Mounting frame for vertical indicators ............................................................. 72

Figure AA.2 – Horizontal indicator ......................................................................................... 73

Figure AA.3 – Arrangement of indicators for different height of equipment ............................ 75

Figure AA.4 – Example for two adjacent accessible sides ..................................................... 75

Figure AA.5 – Examples for an accessible side to a non-accessible side ............................. 76

Figure AA.6 – General setup for testing – Details .................................................................. 78

Figure AA.7 – General setup for calibration ........................................................................... 78

Figure AA.8 – General setup for testing ................................................................................ 78

Figure AA.9 – General setup for user installation .................................................................. 79

Figure AA.10 – Power drive system with 12-pulse diode rectifier supplied by an

external transformer and a motor at the output ...................................................................... 80

Figure AA.11 – Power drive system with integrated transformer and a motor at the

output ................................................................................................................................... 81

Figure AA.12 – Grid interconnection between 50 Hz and 60 Hz grids .................................... 82

Figure AA.13 – Example for test of sub-assemblies of a PECS ............................................. 86

Figure AA.14 – Installation example of mix of accessibility types including 4a or 4b ............ 102

Table 5 – Steady state voltage limits for the decisive voltage classes ................................... 15

Table 6 – Protection requirements for circuit under consideration ......................................... 16

Table 101 – Impulse withstand voltage and temporary overvoltage versus system

voltage from 1 000 V AC or 1 500 V DC up to 36 kV AC or 54 kV DC .................................... 20

Table 102 – Clearance distances for functional, basic or supplementary insulation .............. 22

Table 103 – Creepage distances (in millimetres) ................................................................... 23

Table 104 – Limits for power sources without an overcurrent protective device ..................... 27

Table 105 – Limits for power sources with an overcurrent protective device ......................... 28

Table 22 – Test overview ...................................................................................................... 33

Table 23 – Pull values for handles and manual control securement ....................................... 35

Table 106 – Impulse test voltage .......................................................................................... 36

Table 107 – AC or DC test voltage for circuits connected directly to HV mains supply........... 37

Table A.4 – Examples for protection against electrical shock ................................................ 48

Table C.1 – Symbols used .................................................................................................... 50

Table AA.1 – Definition of accessibility types ........................................................................ 67

Table AA.2 – Single phase-to-earth internal arc fault current depending on the network

neutral earthing..................................................................................................................... 69

Table AA.3 – Parameters for internal fault test according to compartment construction ......... 85

Table AA.4 – Information requirements ................................................................................. 92

---------------------- Page: 7 ----------------------
– 6 – IEC 62477-2:2018 © IEC 2018

Table AA.5 – Example for concepts 2 and 3 (see Clause AA.8)............................................. 93

Table AA.6 – Example for concept 4 (see Clause AA.8) ........................................................ 93

Table AA.7 – Example for not tested or test failed for concepts 5 and 6 (see Clause AA.8) ... 93

Table AA.8 – Example for concept 1 (see Clause AA.8) ........................................................ 94

Table AA.9 – Example for accessibility type 0+ for concepts 5 and 6 (see Clause AA.8) ....... 94

Table AA.10 – Inter
...

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