Distance protection is a vital defense mechanism for electrical transmission lines. It detects faults by measuring impedance changes and promptly isolates faulted sections, ensuring system reliability and minimizing disruptions.
Function overview
Protection functions
Non-switched distance protection with 6 measuring systems (21/21N)
High resistance ground-fault protection for single and three-pole tripping (50N, 51N, 67N)
Ground-fault detection in isolated and resonant-grounded networks
Tele (pilot) protection (85)
Fault locator (FL)
Power-swing detection/tripping (68/68T)
Phase overcurrent protection (50/51/67)
Switch-onto-fault protection (50HS)
STUB bus overcurrent protection (50STUB)
Overvoltage/under voltage protection (59/27)
Over/under frequency protection 81O/U)
Auto-reclosure (79)
Synchro-check (25)
Breaker failure protection (50BF)
Thermal overload protection (49)
Control function
Commands for control of CBs and isolators
Monitoring functions
Trip circuit supervision (74TC)
Self-supervision of the relay
Measured-value supervision
Event logging/fault logging
Oscillographic fault recording
Switching statistics
Front design
Easy operation with numeric keys
Function keys
LEDs for local alarm
PC front port for convenient relay setting
Communication interfaces
Front interface for connecting a PC
System interface for connecting to a control system via various protocols
IEC 61850 Ethernet
IEC 60870-5-103 protocol
PROFIBUS DP
DNP 3
1 serial protection data interface for teleprotection
