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BS EN 50122-2:2022:2023 Edition

BS EN 50122-2:2022:2023 Edition

$167.15

Railway applications. Fixed installations. Electrical safety, earthing and the return circuit – Provisions against the effects of stray currents caused by DC traction systems

Published By Publication Date Number of Pages
BSI 2023 38
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This document specifies requirements for protective provisions against the effects of stray currents, which result from the operation of DC electric traction power supply systems. As several decades’ experience has not shown evident corrosion effects from AC electric traction power supply systems, this document only deals with stray currents flowing from a DC electric traction power supply system. This document applies to all metallic fixed installations which form part of the traction system, and also to any other metallic components located in any position in the earth, which can carry stray currents resulting from the operation of the railway system. This document applies to all new DC lines and to all major revisions to existing DC lines. The principles can also be applied to existing electrified transportation systems where it is necessary to consider the effects of stray currents. This document does not specify working rules for maintenance but provides design requirements to allow maintenance. The range of application includes: 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, and 5) trolleybus systems, c) material transportation systems. This 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 from the contact line system and are not endangered by the electric traction power supply system, c) suspended cable cars, d) funicular railways.

PDF Catalog

PDF Pages PDF Title
2 undefined
9 1 Scope
2 Normative references
10 3 Terms and definitions
4 Identification of hazards and risks
11 5 Criteria for stray current assessment and acceptance
5.1 General
5.2 Criteria for the protection of the tracks
12 5.3 Criteria for systems with steel reinforced concrete or metallic structures
13 5.4 Specific investigations and measures
6 Design provisions
6.1 General
6.2 Return circuit
6.2.1 General
6.2.2 Resistance of running rails
14 6.2.3 Track system
6.2.4 Return conductors
6.2.5 Return cables
6.2.6 Electrical separation between the return circuit and system parts with earth-electrode effect
15 6.2.7 Exceptions for systems with return conductor rails
6.2.8 Rail-to-rail and track-to-track cross bonds
6.3 Non-traction related electrical equipment
6.4 Tracks of other traction systems
6.5 Return busbar in the substation
6.6 Level crossings
6.7 Common power supply for tram and trolleybus
16 6.8 Changeover from the mainline to depot and workshop areas
7 Provisions for structures affected by stray currents
7.1 General
7.2 Conductive civil structures
7.2.1 Basic procedure
7.2.2 Longitudinal interconnection
17 7.2.3 Sectionalized reinforcement
7.2.4 External conductive parts
7.2.5 External cables, pipework and power supplies
7.3 Adjacent pipes or cables
18 7.4 Voltage limiting devices
8 Protective provisions applied to metallic structures
9 Depots and workshops
19 10 Tests and measurements
10.1 Principles
10.2 Supervision of the rail insulation
10.2.1 Repetitive monitoring
10.2.1.1 General
10.2.1.2 Repetitive measurement of the conductance per length of the running rails
10.2.1.3 Repetitive measurement of the rail potential
10.2.2 Continuous monitoring of the rail potential
21 Annex A (informative)Measurement of track characteristics
A.1 Rail resistance
22 A.2 Conductance per length between running rails and steel reinforced structures
23 A.3 Conductance per length for track sections without civil structure
24 A.4 Local conductance per length for track sections without civil structure
26 A.5 Insulated rail joints
27 A.6 Insulating joints between steel reinforced structures
29 Annex B (informative)Stray current assessment – Rail insulation assessment using rail potential
B.1 Repetitive measurements of the rail potential to monitor the conductance
B.2 Example for a continuous monitoring of the rail potential
31 Annex C (informative)Estimation of stray current and impact on metallic structures
C.1 Estimation of the stray currents passing from the running rails to the earth
32 C.2 Estimation of the longitudinal voltage in steel reinforced structures
34 Annex D (informative)Laboratory testing of materials for the insulation of rails
D.1 General
D.2 Test procedure
D.2.1 General
D.2.2 Initial test
D.2.3 Heat Aging
D.2.4 Influence of winter weather and rain
D.2.5 Evaluation
D.3 Acceptance criterion of the tests
35 Annex E (informative)Fastening systems

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BS EN 50122-2:2022
$167.15