Protection and control Relay for feeder,
Grid and generator applicationS


The MRA4 is a high precision and reliable protection and control relay. The intuitive setting concept with plausibility test enables reliable and time optimized configuration of the extensive protection function to a variety of applications such as incoming or outgoing feeder protection, network protection and generator protection. The implemented switchgear management guaranties an efficient and safe control and supervision. The device is a bench mark in flexibility and usability and offers various communication options. The hardware is designed for all nominal values in combination with protection and control functionality. The parameterizing and analyzing software Smart view SE is usable for each HighPROTEC device and free of charge.

Comprehensive protection package
• Six elements phase overcurrent protec tion directional and non-directional (ANSI/IEC/51C/51V)
• Four elements earth fault protection (2) non-directional or directional (multi-polarising)
• Two elements unbalanced load protection
• Voltage protection (2) six elements selectable: : V<, V>, V<(t)
• Six elements unbalanced voltage supervision
• Flexible Fourth Voltage measuring input (2) 2 elements VE> or VX (for synch-check)
• Synchro-check options Generator-to-System or System-to-System
• Each of the six elements frequency protection can be used as: f<, f>, ROCOF, vector surge...
• Six elements power protection each can be used as: P>, P<, Pr, Q>, Q<, Qr, S>, S<
• Two elements power factor (PF)

power quality
THD protection

Demand Management/peak values
• Peak values of current and power,average current and energy demand

Interconnection Package
• The comprehensive interconnection package is summarized within one menu: Non-discriminating active power direction depending load shedding
• FRT (LVRT): Settable FRT-Profiles,optional AR coordinated
• QV-Protection: Undervoltage-Reactive Power protection
• Automatic Reconnection
• Frequency protection:Six elements configurable as f<, f>, df/dt (ROCOF), Vector Surge
• CB-Intertripping
• Synch Check (Generator to mains, mains-to-mains), options e.g. to switch onto dead bus

Sliding-mean-square supervision
• Adjustable (VDE-AR 4105)

• Disturbance recorder: 120 s non volatile
• Fault recorder: 20 faults
• Event recorder: 300 events
• Trend recorder: 4000 non volatile entries

PC Tools
• Setting and analyzing software
• Smart view for free
• Including page editor to design own pages

Commissioning support
• USB connection
• Customizable Display (Single-Line, ...)
• Customizable Inserts
• Copy and compare parameter sets
• Configuration files are convertible
• Forcing and disarming of output relays
• Fault simulator: current and voltage
• Graphical display of tripping characteristics
• 7 languages selectable within the relay

Communication options
• IEC61850
• Profibus DP
• Modbus RTU or Modbus TCP
• IEC60870-5-103
• DNP 3.0 (RTU, TCP, UDP)

• 1 breaker
• Breaker wear

• Up to 80 logic equations for protection,
• control and monitoring

Time synchronisation
• SNTP, IRIG-B00X, Modbus, IEC60870-5-103