Application - ABB REX 521 Technical Reference Manual, General

REX 521
2.2.
10
Protection Relay
Technical Reference Manual, General

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
Standard configurations
Function FB name
blocks (in CD-ROM)
Protection functions
3I> NOC3Low
3I>> NOC3High
3I>>> NOC3Inst
Io> NEF1Low
Io>> NEF1High
Io>>> NEF1Inst
3 DEF2Low
Io>->
3 DEF2High
Io>>->
3 DEF2Inst
Io>>>->
3I>-> DOC6Low
3I>>-> DOC6High
3U> OV3Low
3U>> OV3High
3U< UV3Low
3U<< UV3High
3I2f> Inrush3
Iub> CUB3Low
3Ith> TOL3Cab
O->I AR5Func
Uo> ROV1Low
Uo>> ROV1High
Uo>>> ROV1Inst
f1 Freq1St1
f2 Freq1St2
SYNC1 SCVCSt1
Is2t n< MotStart
3I() PREV3
I2> NPS3Low
I2>> NPS3High
3I< NUC3St1
FUSEF FuseFail
3Ithdev> Tol3Dev
U1<U1U2> PSV3St1
Basic Medium High/Sensor
IEEE
device
number
51 x x x
50/51 x x x
50/51 x x x
51N x x
50N/51N x x
50N x x
67N/51N x
67N x
67N x
67
67
59
59
27
27
68 x x x
46 x x x
49F x x x
79 x
59N
59N
59N
81U/81O
81U/81O
25
48, 14, 66
46R
46
46
37
60
49M
27, 47, 59
1MRS 751108-MUM
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