Protection and control

The REF615R is the most powerful, advanced and simplest

feeder protection relay in its class, offering time and instanta

neous overcurrent, negative sequence overcurrent,

phase discontinuity, breaker failure, thermal overload, and volt

age metering and protection. The relay features optional high

impedance fault (HIZ) and sensitive earth fault (SEF) protection

for grounded and ungrounded distribution systems. The relay

incorporates a flexible three-phase multi-shot auto-reclose

function for automatic feeder restoration in temporary faults on

overhead lines.

Enhanced with safety options, the relay offers a three-channel

arc-fault detection system for supervision of the switchgear as

an option.

The REF615R integrates basic control functionality, which

facilitates the control of one circuit breaker via the relay’s front

panel human machine interface (HMI) or remote control system.

To protect the relay from unauthorized access and to maintain

the integrity of information, the relay has been provided with a

four-level, role-based user authentication system, with individual

passwords for the viewer, operator, engineer, and administra

tor levels. The access control system applies to the front panel

HMI, embedded web browser based HMI, and the PCM600

relay setting and configuration tool.