REX615 is a freely configurable all-in-one protection and control relay

for power generation and distribution applications. 

A wide application coverage combined with a fully modular and scalable

hardware and software ensures maximum flexibility and optimal cost-effectivity

throughout the relay life cycle – from tailoring to adapting to changing and new application-specific requirements.

REX615 represents the next step for ABB’s 615 and 620 series relays

in terms of technological innovation, flexibility, cost-effectiveness and standardization.

As part of ABB’s Relion® protection and control family of relays,

REX615 builds on ABB’s strong heritage of freely configurable multifunctional relays and many proven

protection algorithms.

Features

• IEC 61850 Edition 2.1 and Edition 1. with redundancy support based on HSR and PRP

• Ability to receive two streams of sampled measured values (SMVs) and send one via

IEC 61850-9-2 LE-based process bus communication

• Multifrequency admittance-based earth-fault protection (MFA) for optimal selectivity, sensitivity and reliability also in compensated and isolated networks

• Touch voltage-based earth-fault protection for an optimal balance between safety and supply quality also in compensated networks

• Compliance with the latest grid codes to ensure renewables remain connected during disturbances

• Withdrawable plug-in unit design for swift installation, maintenance and testing

• Optimal cyber security to promote secure connectivity and safeguard today’s network

• Three lens-type arc flash light detection sensors for extended personnel safety