IEC 62128-3:2013

Railway applications - Fixed installations - Electrical safety, earthing and the return circuit - Part 3: Mutual interaction of a.c. and d.c. traction systems

IEC 62128-3:2013 specifies requirements for the protective provisions relating to electrical safety in fixed installations, when it is reasonably likely that hazardous voltages or currents will arise for people or equipment, as a result of the mutual interaction of a.c. and d.c. electric traction systems. It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during maintenance work within electric traction systems. This standard applies to all new lines, extensions and to all major revisions to existing lines.

Applications ferroviaires - Installations fixes - Sécurité électrique, mise à la terre et circuit de retour - Partie 3: Interactions mutuelles entre systèmes de traction en courant alternatif et en courant continu

La CEI 62128-3:2013 spécifie des exigences relatives aux mesures de protection liées à la sécurité électrique des installations fixes, lorsqu'il existe un risque raisonnable de présence de tensions ou de courants dangereux pour les personnes ou les équipements, dû aux interactions entre systèmes de traction à courant alternatif et à courant continu. La présente norme s'applique également à tous les aspects des installations fixes, nécessaires pour garantir la sécurité électrique pendant les travaux de maintenance réalisés au sein des systèmes de traction électrique. La présente norme s'applique à l'ensemble des nouvelles lignes, extensions et révisions majeures apportées aux lignes existantes.

General Information

• Status: Published
• Publication Date: 11-Sep-2013
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: TC 9 - Electrical equipment and systems for railways
• Drafting Committee: WG 49 - TC 9/WG 49
• Current Stage: PPUB - Publication issued
• Start Date: 15-Sep-2013
• Completion Date: 12-Sep-2013

Standards Content (Sample)

IEC 62128-3 ®
Edition 1.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Railway applications – Fixed installations – Electrical safety, earthing and the
return circuit –
Part 3: Mutual interaction of a.c. and d.c. traction systems

Applications ferroviaires – Installations fixes – Sécurité électrique, mise à la
terre et circuit de retour –
Partie 3: Interactions mutuelles entre systèmes de traction en courant alternatif
et en courant continu
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IEC 62128-3 ®
Edition 1.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Railway applications – Fixed installations – Electrical safety, earthing and the

return circuit –
Part 3: Mutual interaction of a.c. and d.c. traction systems

Applications ferroviaires – Installations fixes – Sécurité électrique, mise à la

terre et circuit de retour –
Partie 3: Interactions mutuelles entre systèmes de traction en courant alternatif

et en courant continu
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 45.060 ISBN 978-2-8322-1034-5

– 2 – 62128-3  IEC:2013
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
4 Hazards and adverse effects . 7
4.1 General . 7
4.2 Electrical safety of persons . 7
5 Types of mutual interaction to be considered . 7
5.1 General . 7
5.2 Galvanic coupling . 8
5.2.1 AC and d.c. return circuits not directly connected . 8
5.2.2 AC and d.c. return circuits directly connected or common . 8
5.3 Non-galvanic coupling . 9
5.3.1 Inductive coupling . 9
5.3.2 Capacitive coupling . 9
6 Zone of mutual interaction . 9
6.1 General . 9
6.2 AC . 9
6.3 DC . 10
7 Touch voltage limits for the combination of alternating and direct voltages . 10
7.1 General . 10
7.2 Touch voltage limits for long-term conditions . 11
7.3 AC system short-term conditions and d.c. system long-term conditions . 12
7.4 AC system long-term conditions and d.c. system short-term conditions . 13
7.5 AC system short-term conditions and d.c. system short-term conditions . 14
7.6 Workshops and similar locations . 14
8 Technical requirements and measures inside the zone of mutual interaction . 15
8.1 General . 15
8.2 Requirements if the a.c. railway and the d.c. railway have separate return
circuits . 15
8.2.1 General . 15
8.2.2 Return circuit or parts connected to the return circuit located in the
OCLZ and/or CCZ of the other system . 15
8.2.3 Common buildings and common structures . 16
8.2.4 Inductive and capacitive coupling . 17
8.3 Requirements if the a.c. railway and the d.c. railway have common return
circuits and use the same tracks . 17
8.3.1 General . 17
8.3.2 Measures against stray current . 17
8.3.3 Common structures and common buildings . 18
8.3.4 Exceptions . 18
8.3.5 Design of overhead contact line . 18
8.3.6 Inductive and capacitive coupling . 18
8.4 System separation sections and system separation stations . 18
Annex A (informative) Zone of mutual interaction . 20
Annex B (informative) Analysis of combined voltages . 26

62128-3  IEC:2013 – 3 –
Annex C (informative) Analysis and assessment of mutual interaction . 31
Bibliography . 32

Figure 1 – Maximum permissible combined effective touch voltages (excluding
workshops and similar locations) for long-term conditions . 12
Figure 2 – Maximum permissible combined effective touch voltages under a.c. short-
term conditions and d.c. long-term conditions . 13
Figure 3 – Maximum permissible combined effective touch voltages under a.c. long-
term conditions and d.c. short-term conditions . 14
Figure 4 – Maximum permissible combined effective touch voltages in workshops and
similar locations excluding short-term conditions. 15
Figure 5 – Example of where a VLD shall be suitable for both alternating and direct
voltage . 16
Figure A.1 – Overview of voltages coupled as function of distance and soil resistivity I . 21
Figure A.2 – Overview of voltages coupled as function of distance and soil resistivity II . 22
Figure A.3 – Relation between length of parallelism and zone of mutual interaction
caused by an a.c. railway . 23
Figure B.1 – Definition of combined peak voltage. 27
Figure B.2 – Overview of permissible combined a.c. and d.c. voltages . 28
Figure B.3 – Overview of permissible voltages in case of a duration ≥ 1,0 s for both
a.c. voltage and d.c. voltage . 29
Figure B.4 – Permissible voltages in case of a duration of 0,1 s a.c. voltage and a
duration of 300 s d.c. voltage . 30

– 4 – 62128-3  IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS –
FIXED INSTALLATIONS –
ELECTRICAL SAFETY, EARTHING AND THE RETURN CIRCUIT –

Part 3: Mutual interaction of a.c. and d.c. traction systems

FOREWORD
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