////// SUBSTATIONS. Voltage Limiting Device. VGuard

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1 ////// SUBSTTIONS Voltage Limiting Device

2 GENERL INFORMTION During normal operation of railway system, dangerous voltage can occur across accessible points of the return circuit and earth due to the voltage drops along the return circuit caused by the current train traffic or insulation fault. VOLTGE HZRD In order to limit these voltages below the admissible values defined in EN standard, a voltage limiting device must be used as a short circuiter between negative and earth. ERTH RUNNING RIL STNDRDS Sécheron s voltage limiting devices () are recoverable devices which are compliant with the railway standards: for voltage limiting device of classes 3 and 4, according to EN 5056 standard. for protective provision about electrical safety in VLD-F, VLD-O or both functions, according to EN standard. MIN BENEFITS MIN BENEFITS D Fast response time. D Combined protection of personnel, passengers and installation. Prevention and elimination of dangerous voltage. Low residual voltage guaranteed. utomatically recoverable. Bidirectional operation and protection. Continuous monitoring of the potential of the return circuit. Manually operable on site. Movable connections allowing to by-pass and isolate the equipment in safe way during test or maintenance task on the system. Voltage Limiting Device /

3 VRINTS Sécheron is able to supply two main variants of : /// -B Basic with contactor. Class 3 according to EN standard. /// -H Hybrid with contactor and thyristors. Class 4 according to EN standard. Both variants are available for indoor (IP4) or outdoor (IP65) application. IP4 variant IP65 variant TECHNICL DT Configuration -B -H -B-50 -B-100 -H-50 -H-100 Rated voltage [U N ] 900 to 3600 VDC 900 to 3600 VDC Rated current [I R ] Instantaneous triggering voltage [U TI ] Tolerance on instantaneous triggering voltage N/ N/ 300 or 600 V 300 V: 10% 600 V: 5% Instantaneous response time [T Ri ] N/ < 5 ms Nominal triggering voltage [U Tn ] 50 to 750 V 50 to 750 V Response time [T R ] < 100 ms < 100 ms Non-triggering voltage [U W ] U Tn - 10% U Tn - 10% Residual voltage at rated current < 50 V < 50 V Making capacity [I NSS ] 50 k 100 k 50 k 100 k Short time withstand current (0.1 s) 50 k 100 k 50 k 100 k Leakage current [I L ] N/ 50 m Breaking capacity at 600 V Rated insulation voltage [U Ne ] 3.6 kv 3.6 kv Impulse withstand voltage [U NI ] 40 kv 40 kv Power frequency withstand voltage [U a ] (50 Hz, 1 min) Mechanical characteristics Overall dimensions (W x D x H) 18.5 kv 18.5 kv IP4: 800 x 650 x 100 mm IP65: 835 x 85 x 1635 mm IP4: 800 x 700 x 1500 mm IP65: 835 x 85 x 1635 mm Typical weight Up to 0 kg Up to 90 kg Voltage Limiting Device / 3

4 -B B 1 Earthing contactor SEPCOS: Sécheron protection and control unit 3 VM: Sécheron voltage measuring amplifier 4 MIU: Sécheron current measuring amplifier To earth B To negative bar CUSTOMER BENEFITS Cost efficient. Simple installation through compact design. No commissioning required as the system is supplied ready for operation. 4 Voltage Limiting Device /

5 -H B 1 Earthing contactor SEPCOS: Sécheron protection and control unit 3 VM: Sécheron voltage measuring amplifier 4 MIU: Sécheron current measuring amplifier 5 Limiting resistor 6 nti-parallel thyristors 7 Thyristor command board 8 Surge arrester To earth B To negative bar CUSTOMER BENEFITS Low maintenance due to application of thyristors. Maximum protection for personnel and equipment thanks to short reaction time. Parameterization through the display. Simple installation through compact design. No commissioning required as the system is supplied ready for operation. Especially adapted to application > 1 kv. Voltage Limiting Device / 5

6 OPERTION To ensure the safety of people and equipment, Sécheron s ensures the following combined protection functions: /// VLD-O PROTECTION FUNCTION In normal operation, the origin of the overvoltage is the train traffic and to the fact that permanent equipotential bonding should not be provided because of the risks from damage to assets by stray current, as described in EN 501- standard. The monitors the voltage between the return circuit and earth and prevents that the voltage does not exceed the admissible values by short-circuiting both potentials temporarily and opening automatically in order to minimize stray currents. /// VLD-F PROTECTION FUNCTION * In case of contact fault (i.e. fall of a broken contact wire) between a live part of the traction supply and a conductive earthed part in the overhead contact line zone (OCLZ). The protects against an impermissible voltage by becoming conductive and causing a short-circuit of the line which immediately triggers the release of the DC high-speed circuit breaker. /// LIGHTNING PROTECTION OF INSTLLTION It prevents equipment installed between negative and earth against overvoltage issued from lightning strikes / overvoltages. PROTECTION PRINCIPLE Voltage (V) EN * Thyristor Contactor switch SHORT TERM (VLD-F) LONG TERM (VLD-O) 0 Time (s) The short term protection aims at protecting people and equipment against dangerous accessible voltages that can arise in fault condition, such as the fall of a broken contact wire. -H ensures this type-f function which is required when the source of the impermissible voltage is the voltage on the contact line, when a fault occurs, and the risks are of electric shock by indirect contact as described in EN standard. The long term protection provided by a VLD-O corresponds to protection against impermissible touch voltages that may arise in normal operation due to the train traffic. VLD-O should be able to interrupt the current that flows in it, in order to minimize the risks from stray current. VLD-Os require a long term current capability. The combination of thyristors and switching contactor allows Sécheron s -H to fulfill and cover the requirements of both protection function types: VLD-F and VLD-O. * Only applicable for -H variant. 6 Voltage Limiting Device /

7 OPTIONL SSOCITION WITH SCMS Stray Current Monitoring System (SCMS) is a straightforward and efficient method of stray current monitoring avoiding manual repetitive measurement and any interference with the stray current collecting system. The system measures continuously the rail-to-earth potential under operational conditions, complete with central analysis, visualization, signaling and archiving capacities. lready compatible with SCMS, the collects measurement along the line and transmits data via possible communication protocol. Voltage between the return circuit and the earth structure through a high accuracy sensor. Potential current flowing in the through a high accuracy sensor. status. STRY CURRENT MONITORING SYSTEM BUS PLC PLC PLC V V V TCP/IP: MODBUS-TCP. Optional power distribution protocols: IEC (-5-101), DNP 3.0, IEC Flexibility in connectivity: Copper cable (RS485, RJ45) or optical fiber. Voltage Limiting Device / 7

8 SG85867BEN_D Sécheron S Rue du Pré-Bouvier 5 14 Satigny - Geneva CH-Switzerland Tel: +41 (0) Fax: +41 (0) substations@secheron.com This document is not contractual and contains information corresponding to the level of technology at the date of printing. Sécheron reserves the right to modify and/or improve the product, whose characteristics are described in these documents, as required by new technology at any time. It is the purchaser s responsibility to inform himself, no matter what the circumstances, of the product s maintenance conditions and requirements. Sécheron reserves all rights, especially those arising from our General Delivery Conditions. Copyright 017 Sécheron S