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BSI 23/30482660 DC 2023

BSI 23/30482660 DC 2023

$13.70

BS IEC 62848-3 Railway applications – Fixed installations – DC surge arresters and voltage limiting devices – Part 3: Guidance on application

Published By Publication Date Number of Pages
BSI 2023 54
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PDF Catalog

PDF Pages PDF Title
1 30482660-NC.pdf
3 9_3026e_CDV.pdf
7 FOREWORD
9 INTRODUCTION
1 Scope
2 Normative references
10 3 Terms and definitions
15 4 Graphical symbols for surge arresters and VLDs
16 5 General considerations
5.1 General
17 5.2 Application of surge arresters
5.2.1 General
5.2.2 Insulation level of equipment to be protected
5.2.3 Internal overvoltages
18 5.2.4 Lightning Overvoltages
5.3 Application of VLDs
5.3.1 General
19 5.3.2 Short-term protection
5.3.3 Long-term protection
20 5.3.4 Selection of VLD-F or VLD-O
6 Guideline for Surge Arresters
6.1 General
6.1.1 Electrical characteristics
21 6.1.2 Housing
6.1.3 Porcelain-housed arresters
6.1.4 Polymer-housed arresters
22 6.2 Systems and equipment to be protected by surge arresters
25 6.3 Nominal discharge current In
6.4 Selection of Continuous Operating Voltage
6.4.1 Continuous operating voltage Uc for arresters A1
26 6.4.2 Continuous operating voltage Uc for arresters A2
6.5 Protective level of A1 and A2 arresters.
28 6.6 Charge transfer capability
6.6.1 General
29 6.6.2 Typical overvoltages during clearing a line fault
6.6.3 Arrester A1
30 6.6.4 Arrester A2
6.7 Procedure to select an A1 arrester
34 6.8 Procedure to select an A2 arrester
6.9 Connecting leads of arresters
6.10 Earthing requirements
35 7 Guideline for VLDs
7.1 Introduction
36 7.2 General
7.3 Mass transit railways, trams and trolley busses
7.3.1 General
7.3.2 Trams, trolley busses, light rail transit and metros with OCL
38 7.3.3 Metros with a conductor rail
39 7.4 Railways (DC 1 500 V to DC 3 000 V)
7.4.1 General
7.4.2 Application of VLDs along the lines or at the substations, switching stations and at sectioning points
7.4.2.1 General
40 7.4.2.2 Application of VLD-Os
7.4.2.3 Application of VLD-F
41 7.4.3 Recommended characteristics of VLDs
42 7.5 Workshops
7.5.1 Application of VLD-O
7.5.2 Application of VLD-F
8 Further considerations
8.1 Installation recommendations
8.1.1 Mounting aspect
44 8.1.2 Periodicity of inspection and management of alarms
8.1.2.1 General
8.1.2.2 First installation of a VLD (of a defined Class) in the network
8.1.2.3 Periodic inspection
45 8.1.2.4 Devices with operation and alarm recordings
8.1.2.5 Detailed review in case of major network or rail traffic modifications
8.1.3 Colours of the cables
8.2 Interaction between arresters and VLDs
8.3 Interaction with other systems
8.3.1 Interaction with signalling systems
46 8.3.2 Interaction with earthing systems
8.3.3 Interaction with tunnel earthing systems
8.3.4 Separation of AC cable screens
47 Annex A (informative) Calculation example
54 Bibliography

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BSI 23/30482660 DC 2023
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