SEPCOS-NG protection and control relay

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SEPCOS-NG is a new high-tech generation of equipment that satisfies the most demanding safety requirements applicable to DC electrical power transmission networks.
SEPCOS-NG is a powerful electronic system based on several microprocessors. It is used as a protection and control unit of an outgoing feeder cubicle or rectifier unit in DC traction substations of public transport systems such as streetcars, underground railway, commuter trains or trolley buses.
With the SEPCOS-NG, Sécheron have developed a completely new generation of DC protection relay. Designed as a universal unit it replaces SEPCOS which in the past has demonstrated its usefulness and efficiency in many applications.
SEPCOS-PRO, integrated into SEPCOS-NG, development is based on the safety requirement of the railway standards EN 50126 / EN 50128 and EN 50129 according to safety integrity level SIL 2.
SEPCOS-NG is stand alone, modular, extending and easily adaptable by software. Moreover, it is widely opened to modern communication equipment. It delivers network communication (TCP-IP, Profibus-DP or Modbus) or serial line monitoring facilities (RS-232 or USB).

Main features

• Modular PLC concept, up to 54 Digital input and 30 Digital output possible
• 5,6'' Grafic display with "touchscreen" function
• Fully Approved in railways sub-station environment EN50255-22
• Very good noise immunity thanks to a high sampling rate (25 microsecond) for each of the 4 analog inputs
• Wide communication possibilities including TCP/IP protocol function

Control functions : PLC programming, IEC61131 normalized programming. Application is customized depending of the substation layout and customer mode of functioning. - HSCB ON / OFF control with electric or magnetic holding - Intertripping - Automatic reclosing - Anti-pumping - Line Test function type D or C - External synchronization of the PLC - Measurement supervisor control A useful LED indicator helps to control each input/output status

Bus connections

Open to all customers network and protocols

Modularity and adaptability are the key words of the SEPCOS-NG. We developed this protection and command relay with the objective to get it as adaptable of the customer's needs as possible, and we did that successfully: the SEPCOSNG is indeed open to all customers Network and protocols:

• Fieldbus: MODBUS-RTU, PROFIBUS-DP
• TCP/IP: MODBUS-TCP, STRATON-TCP, PROFINET (under development)
• Specific AC power distribution protocols: IEC60870-5-104 (-5-103), DNP3, IEC61850 (under development)
  

Furthermore the SEPCOS-NG can be adapted to your specific needs.

Example of DC-Substation supervision

Configuration, network protocol and connection to the higher supervision system (SCADA) tailored for each network request.

Applications

With many command and protection functions, SEPCOS-NG satisfies the needs of DC electric traction networks such as outgoing feeder cubicle or rectifier unit.
SEPCOS-NG is used for monitoring traction network segments and for logging events.
It analyses the current gradient and voltages through cyclic measurements at the supply point of the substation to the catenary.
The measurements are made via electrically isolated transducer (for example the isolated amplifier type MIU 10 developed by Sécheron).

Protection

PROTECTION Main Features Last 3 curves of detection memorised (2500 points each): - di/dt - current - voltage - HSCB input/output status memorisation^ Curve memorised pitch : 100 µs...5 s Sampling Rate : ~ 25 µs Storage of the last 3 events: Total 9 curves Availability of the last 1000 events; 1ms time-stamped
	PROTECTION Functions DDL + Delta I DDL + Delta T DDL - Delta I DDL - Delta T Imax + Imax ++ with a second level Imax - I max -- with a second level Thermic Feeder (calculated, based on current) Backup Current (2nd measurement & survey) Backup Voltage (2nd measurement & survey) U feeder Low U feeder High Track Alive Delta U Interrupted Arc Charge Report Falling Voltage

Graphic display & user interface

The display module is a simple, modular and user-friendly monitoring tool that collects the information available from the SEPCOS. It is including the modification of the SEPCOS parameters (Setting protections, Command parameters, etc.). It's based on a resistive touch screen LCD display 1/4 VGA (320x240 pixel). It is also equipped with 8 Led with dynamic labels for the visualization of state of the PLC (Position, Type of fault, …)

Control orders	Event list	Protection parameters
Control of the equipment (orders IN, OUT, RESET etc.)	The events lists stored by the SEPCOS-NG can be displayed (last 1000 events)	Reading and modification of protection parameters, such as DDL Delta I.

Optionnal functions

• Measurement supervisor (current and voltage)
  The measurement supervisor is used for monitoring the voltage and current measuring circuits between the shunts, voltage divider and measuring amplifier, (transducer).
  The current and voltage measurement path is checked for parity and, if a difference (can be set) is found, a signal is generated.

• Power and energy
  This function calculates the energy transported by the feeder.
  The value can be reset to zero or adjusted through its parameter.
  Permanent monitoring of the voltage of the circuit breaker (Ul) and of the line current (Ul).

• Mofify the protection parameters of the command parameters of the cubicles
• Transfer on a PC the information recorded by the SEPCOS
• Download on a SEPCOS the information (parameters) recorded on a PC
• Show at real time the analogical inputs values and detections result

• EMC testing according to IEC 60255-26
• Voltage and Insulation Withstand tests according to IEC 60255-5
• Conform to the EN50126, EN50128 & EN50129 "Safety Integrity Level" standard.
• Conform to IEC 61131-3 PLC standard programming
• Environmental testing
  • Cold storage test and Cooling test according to IEC 60068-2-1
  • Hot storage test and dry heat test according to IEC 60068-2-2
  • Damp heat test according to IEC 60068-2-3
  • Salt mist according to IEC 60068-2-52
• Vibrations, shock and bump test
  • Vibrations test according to IEC 60255-21-1
  • Shock test according IEC 60255-21-2
  • Bump test according IEC 60255-21-3