The REF 550 is an advanced feeder protection system with the newest innovation in protection, control and automation features. The REF550 is the ideal solution designed for protecting and controlling distribution and subtransmission line systems. The REF550 offers the latest HIF Detect
(High Impedance Fault detection) technology for identifying downed conductors on soil, gravel, concrete, sand and other surfaces.
The REF550 also offers a complete package of protection functionality such as: phase and ground instantaneous and time overcurrent protection; negative-sequence overcurrent protection; under/over single and three phase and ground, as well as negative sequence over voltage control and alarm; multi-shot reclosing; and over/under frequency protection for load-shedding application, breaker failure, synchronism check. This protection allows the relay to be used in various distribution and subtransmission applications.
Features:
- HIF Detect Technology
- Multiple Communication Protocols:
- DNP 3.0 Level 2+ (Standard)
- Modbus TCP/IP
- Modbus
- IRIG-B Time Synchronization or SNTP Time Synchronization
- Boolean Logic Editor
- Standard Features Include:
- Digital Fault Records (DFR)
- Load Profile
- User Programmable Curves
- Complete Multifunction Protection
- high impedance fault (HIF) detection
- phase/ground overcurrent
- under/over voltage
- under/over frequency
- synch check
- phase step distance
- breaker failure
- sensitive earth fault (SEF) detection
- load shed/restoration
- Complete Metering and Control
- WinECP communication software