REF620C_F NCFNAAAAABC2DNN1XF Feeder protection and control

The REF620 is the most powerful, advanced and simplestfeeder protection relay in its class, perfectly offering time andinstantaneous overcurrent, negative sequence overcurrent,phase step distance, phase discontinuity, breaker failure, thermal overload, and voltage metering and protection. The relayalso features high impedance fault (HlZ) and sensitive earthfault (SEF) protection for grounded and ungrounded distribu-tion systems. Also, the relay incorporates a flexible three-phasemulti-shot auto-reclose function for automatic feeder restorationin temporary faults on overhead lines.
Enhanced with safety options, the relay offers a three-channelarc-fault detection system for supervision of the switchgear. TheREF620 also integrates basic control functionality, which facili-tates the control of up to 2 circuit breakers via the relay’s frontpanel human machine interface (Hl) or remote control systemTo protect the relay from unauthorized access and to maintainthe integrity of information, the relay has been provided with afour-level, role-based user authentication system, with individualpasswords for the viewer, operator, engineer, and administratorlevels. The access control system applies to the front panelHMl, embedded web browser based HMl, and thePCM600, Protection and Control lED Manager.
REF620 genuinely supports the new lEC 61850 standard forinter-device communication in substations. The relay also sup-ports the industry standard DNP3 and Modbus® protocols. Foraccurate time stamping, REM620 supports synchronization ove!Ethernet using SNTP or over a separate bus using IRlG-B.

REF620E_F NBFNAANNNCC1BNN1XF