BS EN 50526-2:2014
$167.15
Railway applications. Fixed installations. D.C. surge arresters and voltage limiting devices – Voltage limiting devices
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 36 |
This European Standard applies to Voltage Limiting Devices (VLDs) to be applied in d.c. traction systems in order to comply with protective provisions against electric shock from d.c., and mixed a.c. – d.c. voltages, in accordance with the EN 50122 series, taking into account stray current provisions.
VLDs operate in such a way as to connect the track return circuit of d.c. railway systems to the earthing system or to conductive parts within the overhead contact line zone or current collector zone.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | 1 Scope 2 Normative references |
| 8 | 3 Terms and definitions |
| 10 | 4 Classes of VLD |
| 11 | 5 Characteristics and requirements of the VLDs 5.2.1 Normal outdoor service conditions 5.2.2 Normal indoor service conditions |
| 12 | 5.2.3 Abnormal service conditions 5.4.1 Response time 5.4.2 Additional requirements for VLDs of class 1 5.4.3 Additional requirements for VLDs of classes 3 and 4 |
| 14 | 5.7.1 Local control 5.7.2 Remote signalling 5.7.3 Operation and alarm recordings |
| 15 | 6 Type tests |
| 16 | 6.2.1 Procedure for welding shutspark gap VLDs (Class 1) 6.2.2 Procedure for thyristor type VLDs (Class2) |
| 17 | 6.2.3 Procedure for mechanical switching VLDs and for combined thyristors with mechanical switching devices VLDs (Class 3 and Class 4) 6.4.1 General 6.4.2 Procedure to determine the rated current |
| 18 | 6.4.3 Procedure to determine short time withstand current |
| 20 | 6.6.1 Response time for d.c. voltage |
| 22 | 6.6.2 Response time for combined a.c.-d.c. voltage |
| 26 | 6.10.1 Test conditions 6.10.2 Power-frequency voltage withstand test |
| 28 | 7 Routine tests |
| 29 | Annex A (informative) Preferred ranges of the principal properties of the VLDs |
