Protection functions

• Overcurrent protection (definite-time/inverse-time/user-def.)
• Directional overcurrent protection (definite-time/inverse-time/user-def.)
• Sensitive dir./non-dir. earth-fault detection
• Displacement voltage
• Intermittent earth-fault protection
• High-impedance restricted earth fault
• Inrush restraint
• Motor protection
• Overload protection
• Temperature monitoring
• Under-/overvoltage protection
• Under-/overfrequency protection
• Breaker failure protection
• Negative-sequence protection
• Phase-sequence monitoring
• Auto-reclosure
• Fault locator
• Lockout

Control functions/programmable logic

• Flexible number of switching devices
• Position of switching elements is shown on the graphic display
• Local/remote switching via keyoperated switch
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• Extended User-defined logic with CFC (e.g. interlocking)

Monitoring functions

• Operational measured values V, I, f,...
• Energy metering values Wp,Wq
• Circuit-breaker wear monitoring
• Slave pointer
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records

Communication interfaces

• System interface
  • IEC 60870-5-103/ IEC 61850
  • PROFIBUS-FMS/-DP
  • DNP 3.0/MODBUS RTU
• Service interface for DIGSI 4 (modem)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77