3 ABB
1. Description
REJ603 is a self-powered feeder protection
relay, intended for the protection of utility substa-
tions 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.
2. 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.
Table 1. Standard configurations
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