SEPCOS-PRO protection relay

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SEPCOS-PRO is an autonomous, microprocessor-controlled line fault detector. It is a new high-tech generation of protection relay that satisfies the most demanding safety requirements applicable to DC electrical power transmission networks.
SEPCOS-PRO is used for monitoring traction network segments and for logging events. It analyses the current gradient through cyclic measurements at the supply point of the substation to the catenary. The measurements are made via electrically isolated transducer (for example MIU 10).
This protection relay is developed for installation in DC switchgear or rectifier unit of DC substation of public transport systems such as streetcars, underground railway, commuter trains or trolley buses.
With SEPCOS-PRO, Sécheron have developed a completely new generation of line fault detectors. Designed as a universal unit it replaces the SEDEL and the DDL series which in the past has demonstrated its usefulness and efficiency in many applications.
SEPCOS-PRO development is based on the safety requirement of the railway standards EN50126 / EN 50128 and EN 50129 according to safety integrity level SIL 2.

Main features

• Basic system, autonomous system based on microprocessors.

• 4 differential analog inputs for measure and analysis of the current and the voltage of the traction line.

• Protection and recording functions, order of opening on traction line in default.Order of opening & closing and lock of the circuit breaker and reading of the circuit breaker state.

   

   

• Order of opening & closing and lock of the circuit breaker and reading of the circuit state.

• 2 analogical outputs to control DC switchgear ammeter and voltmeter.

The line fault detector “Protection relay” SEPCOS-PRO 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).

Bus connections

MODBUS-RTU : for connections with customer network

• RS232 / USB1.1 : for maintenance and control (SEPCOS-I software)

Applications

Typical application of the SEPCOS-PRO

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

SEPCOS I : Control & parametrization software

The software SEPCOS-I is the interface PC program to configure and read the SEPCOS data.
This software allows in particular to:

• Modify the protection parameters and the command parameters of the cubicle.
• Transfer on a PC the information recorded by the SEPCOS
• Download on a SEPCOS the information (parameters) recorded in a PC
• Show at real time the analogical inputs value and detection result.

SEPCOS approvals

• 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 60068-2-30
  • 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