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BS EN 50122-3:2022

BS EN 50122-3:2022

$131.53

Railway applications. Fixed installations. Electrical safety, earthing and the return circuit – Mutual Interaction of AC and DC traction systems

Published By Publication Date Number of Pages
BSI 2022 32
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 1 Scope
8 2 Normative references
3 Terms and definitions
4 Hazards and adverse effects
4.1 General
4.2 Electrical safety of persons
5 Types of mutual interaction to be considered
5.1 General
9 5.2 Galvanic coupling
5.2.1 AC and DC return circuits not directly connected
5.2.2 AC and DC return circuits directly connected or common
5.3 Non-galvanic coupling
5.3.1 Inductive coupling
10 5.3.2 Capacitive coupling
6 Zone of mutual interaction
6.1 General
6.2 Effects of AC railway systems on DC railway systems
11 6.3 Effects of DC railway systems on AC railway systems
7 Touch voltage limits for the combination of alternating and direct voltages
7.1 General
7.2 Touch voltage limits for long-term conditions
12 7.3 AC system short-term conditions and DC system long-term conditions
13 7.4 AC system long-term conditions and DC system short-term conditions
14 7.5 AC system short-term conditions and DC system short-term conditions
7.6 Workshops and similar locations
15 8 Technical requirements and measures inside the zone of mutual interaction
8.1 General
8.2 Requirements if the AC railway and the DC railway have separate return circuits
8.2.1 General
8.2.2 Return circuit or parts connected to the return circuit of one system located in the OCLZ and/or CCZ of the other system
16 8.2.3 Common buildings and common structures
8.2.3.1 Selection of the strategy for earthing
8.2.3.2 Separation of structure earths
17 8.2.3.3 Common structure earth
8.2.4 Inductive and capacitive coupling
8.3 Requirements if the AC railway and the DC railway have common return circuits and use the same tracks
8.3.1 General
8.3.2 Measures against stray current
8.3.3 Common structures and common buildings
18 8.3.4 Exceptions
8.3.5 Design of overhead contact line
8.3.6 Inductive and capacitive coupling
8.4 System separation sections and system separation stations
19 Annex A (informative)Zone of mutual interaction
A.1 General
A.2 AC system as source
A.2.1 Main parameters
A.2.2 Basic analysis
22 A.2.3 Parameter variations
24 A.3 DC system as source
25 Annex B (informative)Analysis of combined voltages
30 Annex C (informative)Analysis and assessment of mutual interaction
C.1 General
C.2 Analysis of mutual interaction
C.3 System configurations to be taken into consideration

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BS EN 50122-3:2022
$131.53