EN 50122-3:2010

SLOVENSKI STANDARD
01-december-2010
äHOH]QLãNHQDSUDYH6WDELOQHQDSUDYHHOHNWULþQHYOHNHGHO0HGVHERMQR
YSOLYDQMHPHGL]PHQLþQLPLLQHQRVPHUQLPLVLVWHPLYOHNH
Railway applications - Fixed installations - Electrical safety, earthing and bonding - Part
3: Mutual interaction of a.c. and d.c. traction systems
Bahnanwendungen - Ortsfeste Anlagen - Elektrische Sicherheit, Erdung und
Rückstromführung - Teil 3: Gegenseitige Beeinflussung von Wechsel- und
Gleichstrombahnsystemen
Applications ferroviaires - Installations fixes - Sécurité électrique, dispositions pour les
courants de retour et mise à la terre -- Partie 3: Interactions entre systèmes de traction
en courant alternatif et en courant continu
Ta slovenski standard je istoveten z: EN 50122-3:2010
ICS:
29.280 (OHNWULþQDYOHþQDRSUHPD Electric traction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50122-3
NORME EUROPÉENNE
October 2010
EUROPÄISCHE NORM
ICS 29.120.50; 29.280
English version
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 -  Bahnanwendungen -
Installations fixes - Ortsfeste Anlagen -
Sécurité électrique, mise à la terre et Elektrische Sicherheit, Erdung und
circuit de retour - Rückleitung -
Partie 3: Interactions mutuelles entre Teil 3: Gegenseitige Beeinflussung von
systèmes de traction en courant alternatif Wechselstrom- und
et en courant continu Gleichstrombahnsystemen

This European Standard was approved by CENELEC on 2010-10-01. 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, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50122-3:2010 E
Foreword
This European Standard was prepared by SC 9XC, Electric supply and earthing systems for public transport
equipment and ancillary apparatus (Fixed installations), of Technical Committee CENELEC TC 9X, Electrical
and electronic applications for railways. It was submitted to the formal vote and was approved by CENELEC
as EN 50122-3 on 2010-10-01.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights.

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) 2011-10-01

– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-10-01
This draft European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of EC Directives
96/48/EC (HSR), 2001/16/EC (CONRAIL) and 2008/57/EC (RAIL). See Annex ZZ.
______________
– 3 – EN 50122-3:2010
Contents
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Hazards and adverse effects . 6
4.1 General . 6
4.2 Electrical safety of persons . 6
5 Types of mutual interaction to be considered . 6
5.1 General . 6
5.2 Galvanic coupling . 7
5.3 Non-galvanic coupling . 7
6 Zone of mutual interaction . 8
6.1 General . 8
6.2 A.C. . 8
6.3 D.C. . 8
7 Touch voltage limits for the combination of alternating and direct voltages . 9
7.1 General . 9
7.2 Touch voltage limits for long-term conditions . 9
7.3 A.C. system short-term conditions and d.c. system long-term conditions . 10
7.4 A.C. system long-term conditions and d.c. system short-term conditions . 11
7.5 A.C. system short-term conditions and d.c. system short-term conditions . 12
7.6 Workshops and similar locations . 12
8 Technical requirements and measures inside the zone of mutual interaction . 13
8.1 General . 13
8.2 Requirements if the a.c. railway and the d.c. railway have separate return circuits. 13
8.3 Requirements if the a.c. railway and the d.c. railway have common return circuits and use
the same tracks . 15
8.4 System separation sections and system separation stations . 16
Annex A (informative) Zone of mutual interaction . 17
A.1 Introduction . 17
A.2 A.C. system as source . 17
A.3 D.C. system as source . 21
Annex B (informative) Analysis of combined voltages . 22
Annex C (informative) Analysis and assessment of mutual interaction . 27
C.1 General . 27
C.2 Analysis of mutual interaction . 27
C.3 System configurations to be taken into consideration . 27
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives . 28
Bibliography . 29

Figures
Figure 1 ― Maximum permissible combined effective touch voltages (excluding workshops and similar
locations) for long-term conditions . 10
Figure 2 ― Maximum permissible combined effective touch voltages under a.c. short-term conditions
and d.c. long-term conditions . 11
Figure 3 ― Maximum permissible combined effective touch voltages under a.c. long-term conditions
and d.c. short-term conditions. 12
Figure 4 ― Maximum permissible combined effective touch voltages in workshops and similar locations
excluding short-term conditions . 13
Figure 5 ― Example of where a VLD shall be suitable for both alternating and direct voltage . 14
Figure A.1 ― Overview of voltages coupled in as function of distance and soil resistivity I . 18
Figure A.2 ― Overview of voltages coupled in as function of distance and soil resistivity II . 19
Figure A.3 ― Relation between length of parallelism and zone of mutual interaction caused by an a.c.
railway . 20
Figure B.1 ― Definition of combined peak voltage . 23
Figure B.2 ― Overview of permissible combined a.c. and d.c. voltages . 24
Figure B.3 ― Overview of permissible voltages in case of a duration ≥ 1,0 s both a.c. voltage and d.c.
voltage . 25
Figure B.4 ― Permissible voltages in case of a duration 0,1 s a.c. voltage and a duration 300 s d.c.
voltage . 26

– 5 – EN 50122-3:2010
1 Scope
This European Standard 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.
The mutual interaction can be of any of the following kinds:
– parallel running of a.c. and d.c. electric traction systems;
– crossing of a.c. and d.c. electric traction systems;
– shared use of tracks, buildings or other structures;
– system separation sections between a.c. and d.c. electric traction systems.
Scope is limited to basic frequency voltages and currents and their superposition. This European Standard
does not cover radiated interferences.
This European Standard applies to all new lines, extensions and to all major revisions to existing lines for the
following electric traction systems:
a) railways;
b) guided mass transport systems such as:
1) tramways,
2) elevated and underground railways,
3) mountain railways,
4) trolleybus systems, and
5) magnetically levitated systems, which use a contact line system;
c) material transportation systems.
The standard does not apply to:
d) mine traction systems in underground mines;
e) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g.
exhibition structures) in so far as these are not supplied directly or via transformers from the contact line
system and are not endangered by the traction power supply system for railways;
f) suspended cable cars;
g) funicular railways;
h) procedures or rules for maintenance.
NOTE The rules given in this European Standard can also be applied to mutual interaction with non-electrified tracks, if hazardous
voltages or currents can arise from a.c. or d.c. electric traction systems.
2 Normative references
The following referenced documents are indispensable for the application of this document. For da
...