Protection functions
Time-overcurrent protection
Directional time-overcurrent protection
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
Rate-of-frequency-change protection
Power protection ( e.g. reverse, factor)
Breaker failure protection
Negative-sequence protection
Phase-sequence monitoring
Synchronization
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)
Additional interface for temperature detection ( RTD-box)
Front interface for DIGSI 4
Time synchronization via IRIG B/ DCF77