ABB REJ603 Description Self-powered feeder protection 605 series

Description

REJ603 is a self-powered feeder protection

relay, intended for the protection of utility substations and industrial power systems, in secondary

distribution networks. REJ603 is a member of ABB’s Relion® product family and part of its 605 series.

The feeder protection relay REJ603 is designed to be a part of Ring Main Units (RMU) and secondary distribution switchgears.

The REJ603 relay is a self-powered numerical relay, which receives power from the main current transformers.

This way REJ603 is an ideal choice for installations where an auxiliary supplies are not available and hence is suitable

for unmanned distribution substations having no auxiliary supplies.

Relay has add-on optional function of remote trip through binary input with selection of auxiliary power version.

Relay functions

The relay provides an optimized composition of protection and monitoring functionality in one unit,

with the best performance usability in its class and are based on ABB’s in-depth knowledge of protection and numerical technology.

REJ603 offers pre-configured functionality which facilitates easy and fast commissioning of switchgear.

To emphasize the simplicity of relay’s usage, only application specific parameters needs to set within the relay’s intended area of application.

The relay also has short power up time which ensures fast operation during switch on to fault.

The relay supports functions as indicated in Table 2.

Protection functions

REJ603 offers three-stage overcurrent and twostage earth-fault protection functions.

The transformer inrush detector function is incorporated to prevent unwanted tripping’s due to energizing of transformers.

The low-set stages for overcurrent and earthfault protection are equipped with selectable characteristics – Definite time (DT) and Inverse

definite minimum time (IDMT).

The relay featuresstandard IDMT characteristics according IEC 60255-151. Normal Inverse (NI), Very Inverse (VI),

Extremely Inverse (EI), Long-time Inverse (LI) and IDMT characteristics as per ANSI C37.112 Moderate inverse,

Normal Inverse, Very inverse, Extremely inverse.

The relay also has special characteristics like RI, HR and FR fuse,which allows better co-ordination with the rest of the network.

Further relay offers thermal overload protection for feeder, cable and transformer.