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Homepage>BS Standards>29 ELECTRICAL ENGINEERING>29.120 Electrical accessories>29.120.50 Fuses and other overcurrent protection devices>20/30430760 DC BS EN 50122-2. Railway applications. Fixed installations. Electrical safety, earthing and the return circuit Part 2. Provisions against the effects of stray currents caused by DC traction systems
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immediate downloadReleased: 2020-11-27
20/30430760 DC BS EN 50122-2. Railway applications. Fixed installations. Electrical safety, earthing and the return circuit Part 2. Provisions against the effects of stray currents caused by DC traction systems

20/30430760 DC

BS EN 50122-2. Railway applications. Fixed installations. Electrical safety, earthing and the return circuit Part 2. Provisions against the effects of stray currents caused by DC traction systems

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Standard number:20/30430760 DC
Pages:32
Released:2020-11-27
Status:Draft for Comment
DESCRIPTION

20/30430760 DC


This standard 20/30430760 DC BS EN 50122-2. Railway applications. Fixed installations. Electrical safety, earthing and the return circuit is classified in these ICS categories:
  • 29.280 Electric traction equipment
  • 29.120.50 Fuses and other overcurrent protection devices
This document specifies requirements for protective provisions against the effects of stray currents, which result from the operation of DC traction systems. As several decades' experience has not shown evident corrosion effects from AC traction systems and ac-tual investigations are not completed, this document only deals with stray currents flowing from a DC trac-tion 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) trolleybus systems, and 5) magnetically levitated systems, which use a contact line system, c) material transportation systems. This document 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 from the contact line system and are not endangered by the traction power supply system, f) suspended cable cars, g) funicular railways.