TRACTION NETWORK MONITORING AND PROTECTION SYSTEM SMTN-3

Traction networks protection is provided by monitoring of traction network voltage and current dynamics change.
In case of protective function preset parameters exceed the system issues a command to open high speed circuit breaker.

SMTN-3 provides the following operation capabilities:

• measurement of traction network voltage and current value and shape in different modes, including short-circuit in line;
• protection of traction network against short-circuit currents, including remote short circuits low currents and overloads;
• oscillography and long-term memory record of voltage and current value and shape under short circuits (one of emergency process protections detection in traction network);
• waveforms storage and display, as well as data for further analysis transfer to upper level system (or PC);
• software-based internal configuration setting (protections input, protective characteristics selection, number of protection stages, etc.);
• local and remote input, storage and display of protection settings;
• storage of two setting sets and switching of setting sets by external signal;
• information on the number and time of protections operation storage and output;
• analysis of current distribution between incoming panels.

PROTECTION FUNCTIONS

SMTN-3 provides smooth and reliable operation of the system, as well as filtering against false tripping. It performs the following protection functions:

• instantaneous overcurrent;
• overcurrent protection;
• current rate of rise protection;
• current increment directional protection;
• overvoltage protection;
• undervoltage protection;
• thermal protection;
• breaker failure.

DC SWITCHGEARS compliant to IEC 61992 / EN 50127 Standards

More information : Brochure(PDF) on TRACTION NETWORK MONITORING AND PROTECTION SYSTEM SMTN-3