Protection functions

• Differential protection, line 87L
• 3I0 differential protection 87N L
• Ground-fault differential protection for systems with resonant or isolated neutral 87Ns L Optional
• Definite time-overcurrent protection with delay for phase 50 TD (3 stages)
• Definite time-overcurrent protection with delay for earth 50N TD (3 stages)
• Inverse time-overcurrent protection (phase) 51
• Inverse time-overcurrent protection (ground) 51N
• Inrush current detection
• Circuit-breaker failure protection 50BF
• Trip-circuit supervision 74TC
• Lockout 86
• Circuit-breaker intertripping scheme 85 DT
• External trip initiation
• Undervoltage/overvoltage protection 27/59 Optional
• Underfrequency/overfrequency protection 81 U/O Optional
• Directional time-overcurrent protection (phase) 67 (3 stages) Optional
• Directional time-overcurrent protection (ground) 67N (3 stages) Optional
• Automatic reclosing 79 Optional
• Flexible protection functions for current, voltage, power, cos?, frequency Partly optional
• Thermal overload protection 49

Control functions /programmable logic

• Commands (e.g. for the control of circuit-breakers, disconnect switches, grounding switches, etc.) through:
  • keyboard
  • binary inputs
  • DIGSI 4
  • communication interface
• User-defi ned PLC logic with CFC (e.g. interlocking).

Monitoring functions

• Operational measured values V, I, f
• Energy metering values Wp, Wq
• Circuit-breaker wear monitoring
• Minimum and maximum values
• Trip circuit supervision
• Fast measuring voltage failure “fuse-failure-monitor”
• 8 oscillographic fault records.

Communication interface

• System interface
  • IEC 61850 Edition 1 and 2
  • IEC 60870-5-103
  • MODBUS RTU
  • DNP 3.0
  • PROFIBUS-DP
  • Ethernet redundancy protocols RSTP, PRP and HSR
• Service interface
  • USB front interface for DIGSI 4
  • RS232/RS485 (instead of the system interface)
• Protection interface
  • Fiber-optic connection and/or
  • Two-wire connection.

Hardware

• 4 current transformers
• 0/3 voltage transformers
• 3/5/7 binary inputs (thresholds confi gurable using software)
• 5/8 binary outputs (2 changeover)
• 1 life contact
• Pluggable current and voltage terminals.