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BS EN 50526-3:2016

BS EN 50526-3:2016

$198.66

Railway application. Fixed installations. D.C. surge arresters and voltage limiting devices – Application Guide

Published By Publication Date Number of Pages
BSI 2016 56
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This Application Guide supports the European Standards EN 50526‑1 and EN 50526‑2 .

Guidance is offered on the following subjects:

  • the selection and installation of surge arresters;

  • the selection and installation of voltage limiting devices as VLD-O and VLD-F;

  • the arrangement of the surge arresters and VLDs.

Because of differences in the established, proven methods, electric traction systems of nominal voltage d.c. 600 V — d.c. 750 V are treated separately from the systems at higher nominal voltages.

This Application Guide only applies to d.c. electrified traction systems

PDF Catalog

PDF Pages PDF Title
4 Content Page
6 European foreword
7 Introduction
8 1 Scope
2 Normative references
9 3 Terms and definitions
15 4 General considerations
4.1 General
16 4.2 Application of surge arresters
4.2.1 General
4.2.2 Insulation level of equipment to be protected
4.2.3 Internal overvoltages
17 4.2.4 Lightning Overvoltages
18 4.3 Application of VLDs
4.3.1 General
Figure 1 – Permissible touch voltages in d.c. traction systems according to EN 50122-1
4.3.2 Short term protection
19 4.3.3 Long term protection
4.3.4 Selection of VLD-F or VLD-O
5 Symbols for surge arresters and VLDs
20 6 Guideline for Surge Arresters
6.1 General
6.1.1 Electrical characteristics
Figure 2 – Typical residual voltage of a metal oxide arrester as a function of the current
21 Table 1 – Typical lightning and switching protective levels of d.c. metal oxide arresters.
6.1.2 Housing
6.1.3 Porcelain-housed surge arresters
6.1.4 Polymer-housed surge arresters
22 Table 2 – Some characteristics of porcelain-housed and polymer-housed arresters
6.2 Systems and equipment to be protected by surge arresters
23 Figure 3 – Scheme of application of surge arresters (preferred in 1,5 and 3 kV systems)
24 Figure 4 – Alternative scheme of application of 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 Table 3 – Minimum value of Uc
6.4.2 Continuous operating voltage Uc for arresters A2
Table 4 – Recommended minimum values of Uc of A2 arresters
6.5 Protective level of A1 and A2 arresters.
28 Figure 5 – Overvoltage travelling at the speed c along a line terminating onto the device D protected by the surge arrester A1
29 6.6 Charge transfer capability
6.6.1 General
Table 5 – Example of charge associated to the flow of a current of a given shape and amplitude through an arrester
6.6.2 Typical overvoltages during clearing a line fault
30 Figure 6 – Equivalent circuit used for the simulation of the transient voltages at clearing of a OCL-RC fault
31 Table 6 – Values of circuit breaker resistances as a function of time
Table 7– Constants of the line represented for each 750 m section
Table 8 – Constants of the line represented per length of line
32 Figure 7 – Energization of a d.c.3 000 V faulty line – Equivalent circuit
Figure 8 – Short circuit current I as a function of time. The fault inception is at 20 ms, the circuit breaker begins to open approximately at 52 ms, when the current is approximately 2 500 A, the fault is cleared at about 70 ms
33 Figure 9 – Voltage to earth of the line sending end as a function of time
Figure 10 – Voltage of line sending end to the negative busbar as a function of time
34 Figure 11 – Voltage of the track to the earth at the place of the short circuit as a function of time
Figure 12 – Voltage to earth of the negative busbar in the substation as a function of time
35 Figure 13 – Voltage across the contacts of the circuit breaker as a function of time
6.6.3 Arrester A1
36 6.6.4 Arrester A2
6.7 Procedure to select an A1 arrester
37 Figure 14 – flow chart for selection of arrester
38 Figure 15 – Surge arrester A1 for d.c. 750 V, d.c. 1 500 V and d.c. 3 000 V. (example of application of method A)
39 Figure 16 – Insulation coordination of the OCL and A1 surge arresters
40 6.8 Procedure to select an A2 arrester
6.9 Connecting leads of arresters
6.10 Earthing requirements
41 Figure 17 – Lightning impulse pole footing resistance as a function of the power frequency resistance
7 Guideline for VLDs
7.1 Introduction
42 7.2 General
7.3 Mass transit railways and trams (Un up to d.c. 750 V)
7.3.1 General
7.3.2 Trams with OCL
43 Figure 18 – Example for the application of VLD-F at exposed conductive parts in tramways within the OCLZ
44 7.3.3 Metros with a conductor rail
45 Figure 19 – VLD-O to protect persons against high touch voltages at metros in normal operation
7.3.4 Light-rail metros with OCLs
7.4 Railways (d.c. 1 500V … d.c. 3 000 V)
7.4.1 General
7.4.2 Application of VLDs along the lines or at the substations and in the sectioning posts
7.4.2.1 General
46 7.4.2.2 Application of VLD-Os
7.4.2.3 Application of VLD-F
47 Table 9 – Recommended maximum distances, x, in between two consecutive VLDs along the d.c. 1 500 V and d.c. 3 000 V lines
7.4.3 Recommended characteristics of VLDs
48 Table 10 – Recommended characteristics of VLDs
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
Figure 20 – Normal bonding of a Class 1 and 2 VLD
49 Figure 21 – Normal bonding of a Class 3 and 4 VLD
Figure 22 – Example of insulation of the terminals of a VLD from the enclosure
50 Figure 23 – Example of insulation of the terminals of a VLD from the enclosure and panel
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
51 Table 11 – Parameters to be verified in periodic inspections of VLDs
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
52 8.3.2 Interaction with earthing systems
8.3.3 Interaction with tunnel earthing systems
8.3.4 Separation of a.c. cable screens
53 Bibliography

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BS EN 50526-3:2016
$198.66