ABB REX 521 Technical Reference Manual, General

10
1MRS 751108-MUM
Protection Relay
Technical Reference Manual, General
REX 521
2.2. Application
The REX 521 is designed for protection of incoming and outgoing feeders in
medium voltage distribution substations. Further, the relay can, for example, be
applied to back-up protection of power transformers and back-up for high voltage
line protection relays.
HW versions Basic Medium High/Sensor
Standard configurations
B01 B02 M01 M02 H01
1
H02 H03 H04 H05 H06 H07 H08
6
Function
blocks
FB name
(in CD-ROM)
IEEE
device
number
Protection functions
3I> NOC3Low 51 xxx x xxxxxxx
3I>> NOC3High 50/51 xxx x xxxxxxx
3I>>> NOC3Inst 50/51 x x x x x x x x x x
Io> NEF1Low 51N x x
x
2
xxx
Io>> NEF1High 50N/51N x x
x
2
xxx
Io>>> NEF1Inst 50N x x
x
2
xx
Io>->
3
DEF2Low 67N/51N x xxxxx x
Io>>->
3
DEF2High 67N x xxxxx x
Io>>>->
3
DEF2Inst 67N x xxxxx
3I>-> DOC6Low 67 x
x
4
x
3I>>-> DOC6High 67 x
x
4
3U> OV3Low 59 xxxx
3U>> OV3High 59 x x x x
3U< UV3Low 27 x x x x
3U<< UV3High 27 x x x x
3I2f> Inrush3 68 xxx xxxxxx x
Iub> CUB3Low 46 xxx xxxxx
3Ith> TOL3Cab 49F xxx xxxxx
O->I AR5Func 79 x xxxxx
Uo> ROV1Low 59N x x x
Uo>> ROV1High 59N x x x
Uo>>> ROV1Inst 59N x x x
f1 Freq1St1 81U/81O x x x x
f2 Freq1St2 81U/81O x
SYNC1 SCVCSt1 25 x x
Is2t n< MotStart 48, 14, 66 x
3I() PREV3 46R x
I2> NPS3Low 46 x
I2>> NPS3High 46 x
3I< NUC3St1 37 x
FUSEF FuseFail 60 x
3Ithdev> Tol3Dev 49M x x x
U1<U1U2> PSV3St1 27, 47, 59 x

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English