Description - ABB REF601 Product Manual

ABB
Feeder Protection
REF601 IEC
Product Version: 1.0

1. Description

REF601 is a dedicated feeder protection relay,
intended for the protection, measurement and
supervision of utility substations and industrial
power systems.
Engineered from the ground up, the relay is in-
spired by and is compatible with the Rogowski
coil sensor for current measurement. The new
feeder protection relay is designed to unleash the
advantages of current sensors for protection and
control in medium voltage applications.
2. Protection Functions
REF601 offers three-stage overcurrent and two-
stage earth-fault protection functions. Transform-
er inrush detector function is also incorporated
to prevent unwarranted trippings.
Protection
Three-phase non-directional overcurrent, low-set stage
Three-phase non-directional overcurrent, high-set stage
Three-phase non-directional overcurrent, very high-set stage
Non-directional earth-fault, low-set stage
Non-directional earth-fault, high-set stage
Three phase transformer inrush detector
REF601
Fig. 1 Protection function overview of feeder
protection REF601 with earth current
measurement by internal calculation
The low-set stages for overcurrent and earth-
fault protection are equipped with selectable
Definite-time (DT) and Inverse-Definite Minimum
Time (IDMT) characteristics. The relay features
standard IDMT characteristics – Normal Inverse
(NI), Very Inverse (VI), Extremely Inverse (EI) &
Long-time Inverse (LI) and a special characteristic
RI inverse (RI) for better co-ordination with rest
of the network.
The table below indicates the protection functions
available in the relay.
P-1
P-2
Fig. 2 Protection function overview of feeder
protection REF601 with earth current
measurement by external CBCT
1MDB07207-YN C
Issued: January 2009
Revision: C /19 Jan. 2009
IEC ANSI
Code Code
3I > 51
3I >> 50 / 51
3I >>> 50
Io > 51N
Io >> 50N/51N
3I > 68
2f
P-1
P-2
REF601
3