1. Description
REF601 is a dedicated feeder protection relay,
intended for the protection and control of utility
substations and industrial power systems, in primary
and secondary distribution networks. REF601 is a
member of ABB’s Relion
®
product family and part of
its 605 series.
The relay uses the Rogowski coil sensors for cur-
rent measurement. The new feeder protection relay
is designed to unleash the advantages of current
sensors for protection and control in medium voltage
applications.
2. Relay functions
REF601 offers pre-configured functionality which fa-
cilitates easy and fast commissioning of switchgear.
To emphasize the relay’s simplicity of usage, only ap-
plication specific parameters needs to set within the
relay’s intended area of application.
The settings can be changed by LHMI (local human-
machin interface) or through optional communication
interface MODBUS master with setting capability.
The relay offers protection, control, measurement
and condition monitoring functionality.
Issued: 2012-03-27
Revision: E
Table 1. Supported functions of REF601
Functionality
IEC ANSI
Non-directional overcurrent protection, low-set stage 3I> 51
Non-directional overcurrent protection, high-set stage 3I>> 50-1
Earth-fault protection, low-set stage Io> 51N
Earth-fault protection, high-set stage Io>> 50N
Three phase transformer inrush detector 3I
2f
> 68
Non-directional overcurrent protection, very high-set stage 3I>>> 50-2
Control
Condition monitoring
Trip circuit supervision TCS TCM
Measurement
Circuit-breaker control I <-> O CB I <-> O CB
Protection
Three-phase current measurement 3I 3I
Residual current measurement Io In
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