Feeder protection

From generation through transmission and distribution to the consumer, our relays protect the entire energy chain across various voltage levels. They operate safely and precisely and have proven themselves in power supply, industry, and other energy systems.

Key protection functions include:

  • ANSI 25/A              synchro check and automatic synchronization
  • ANSI 27                  undervoltage protection
  • ANSI 50                  instantaneous overcurrent protection
  • ANSI 50G                ground overcurrent protection
  • ANSI 67G                directional ground overcurrent protection
  • ANSI 50BF              breaker failure 
  • ANSI 51                  delayed overcurrent protection
  • ANSI 59                  overvoltage protection
  • ANSI 64/59N          ground overvoltage protection
  • ANSI 67                  directional overcurrent
  • ANSI 81                  frequency protection (over- and underfrequency)

SYMAP®F is suitable for feeder, shore connection, bus tie, and similar applications.