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EVS-EN 50122-3:2022

Railway applications - Fixed installations - Electrical safety, earthing and the return circuit - Part 3: Mutual Interaction of AC and DC traction systems

General information
Valid from 15.09.2022
Base Documents
EN 50122-3:2022
Directives or regulations
None

Standard history

Status
Date
Type
Name
15.09.2022
Main
06.12.2010
Main
This document 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 AC and DC electric power supply traction systems.
It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during
maintenance work within electric power supply traction systems.
The mutual interaction can be of any of the following kinds:
— parallel running of AC and DC electric traction power supply systems;
— crossing of AC and DC electric traction power supply systems;
— shared use of tracks, buildings or other structures;
— system separation sections between AC and DC electric traction power supply systems.
The scope is limited to galvanic, inductive and capacitive coupling of the fundamental frequency voltages and
currents and their superposition.
This document applies to all new lines, extensions and to all major revisions to existing lines for the following
electric traction power supply systems:
a) railways;
b) guided mass transport systems such as:
1) tramways,
2) elevated and underground railways,
3) mountain railways,
4) magnetically levitated systems, which use a contact line system,
5) trolleybus systems, and
6) electric traction power supply systems for road vehicles, which use an overhead contact line system;
c) material transportation systems.
The document does not apply to:
a) electric traction power supply systems in underground mines;
b) 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 electric traction power supply system for railways;
c) suspended cable cars;
d) funicular railways;
e) procedures or rules for maintenance.
The rules given in this document can also be applied to mutual interaction with non-electrified tracks, if
hazardous voltages or currents can arise from AC or DC electric traction power supply systems.
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