Differential Protection Relay for Two Line Ends
Protection functions
• Differential protection for universal use with power lines and cables on all voltage levels with phase-segregated measurement (87L)
• Two line ends capability
• Suitable for transformers in protected zones (87T)
• Restricted earth-fault protection (87N) if a transformer iswithin the protection zone
• Well-suited for serial compensated lines
• Two independent differential stages: one stage for sensitive measuring for highresistance faults and one stage for highcurrent
faults and fast fault clearance
• Breaker-failure protection (50BF)
• Phase and earth overcurrent protection with directional element (50, 50N, 51, 51N, 67, 67N)
• Phase-selective intertripping (85)
• Overload protection (49)
• Over/undervoltage protection (59/27)
• Over/underfrequency protection (81O/U)
• Auto-reclosure single/three-pole (79)
Control functions
• Command and inputs for ctrl. of CB and disconnectors (isolators)
Monitoring functions
• Self-supervision of the relay
• Trip circuit supervision (74TC)
• 8 oscillographic fault records
• CT-secondary current supervision
• Event logging / fault logging
• Switching statistics
Front design
• User-friendly local operation
• PC front port for convenient relay setting
• Function keys and 8 LEDs f. local alarm
Communication interfaces
• 1 serial protection data (R2R) interface
• Front interface for PC connection
• System interface
− IEC 61850 Ethernet
− IEC 60870-5-103 protocol
− PROFIBUS-DP, DNP 3.0 and MODBUS
• Service / modem interface (rear)
• Time synchronization via IRIG-B, DCF77 or system interface
Features
• Browser-based commissioning tool
• Direct connection to digital communi
Protection functions
• Differential protection for universal use with power lines and cables on all voltage levels with phase-segregated measurement (87L)
• Two line ends capability
• Suitable for transformers in protected zones (87T)
• Restricted earth-fault protection (87N) if a transformer iswithin the protection zone
• Well-suited for serial compensated lines
• Two independent differential stages: one stage for sensitive measuring for highresistance faults and one stage for highcurrent
faults and fast fault clearance
• Breaker-failure protection (50BF)
• Phase and earth overcurrent protection with directional element (50, 50N, 51, 51N, 67, 67N)
• Phase-selective intertripping (85)
• Overload protection (49)
• Over/undervoltage protection (59/27)
• Over/underfrequency protection (81O/U)
• Auto-reclosure single/three-pole (79)
Control functions
• Command and inputs for ctrl. of CB and disconnectors (isolators)
Monitoring functions
• Self-supervision of the relay
• Trip circuit supervision (74TC)
• 8 oscillographic fault records
• CT-secondary current supervision
• Event logging / fault logging
• Switching statistics
Front design
• User-friendly local operation
• PC front port for convenient relay setting
• Function keys and 8 LEDs f. local alarm
Communication interfaces
• 1 serial protection data (R2R) interface
• Front interface for PC connection
• System interface
− IEC 61850 Ethernet
− IEC 60870-5-103 protocol
− PROFIBUS-DP, DNP 3.0 and MODBUS
• Service / modem interface (rear)
• Time synchronization via IRIG-B, DCF77 or system interface
Features
• Browser-based commissioning tool
• Direct connection to digital communi
