Technical data

14
1MRS751108-MUM
Protection Relay
Technical Reference Manual, General
REX 521
3.2. 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.
Table 3.2.-1 Standard configurations for REX 521
HW versions Basic Medium High/Sensor
Standard configurations B01 B02 M01 M02
H01
a
H02H03H04H05H06H07
H08
bc
H09
bc
H50
b
H51
b
IEC
symbol
ANSI
device
number
FB name
(CD-ROM)
Protection
3I> 51-1 NOC3Low x x x x x x x x x x x x x x
3I>> 51-2 NOC3High x x x x x x x x x x x x x x
3I>>> 51-3 NOC3Inst x x x x x x x x x x x x x
Io> 51N-1 NEF1Low x x
x
d
xxxxxx
Io>> 51N-2 NEF1High x x
x
d
xxxxxx
Io>>> 51N-3 NEF1Inst x x
x
d
xxx
Io>-->
e
67N-1 DEF2Low x x x x x x x x x
Io>>-->
e
67N-2 DEF2High x x x x x x x x x
Io>>>-->
e
67N-3 DEF2Inst x x x x x x
3I>--> 67-1 DOC6Low
x
f
x
f
x
f
x
f
3I>>--> 67-2 DOC6High
x
f
x
f
x
f
x
f
3U> 59-1 OV3Low x x x x x x x
3U>> 59-2 OV3High x x x x x x
3U< 27-1 UV3Low x x x x x x x
3U<< 27-2 UV3High x x x x x x
3I2f> 68 Inrush3 x x x x x x x x x x x x
Iub> 46 CUB3Low x x x x x x x x
3Ith> 49F TOL3Cab x x x x x x x x
O-->I 79 AR5Func x x x x x x x x
Uo> 59N-1 ROV1Low x x x x x x
Uo>> 59N-2 ROV1High x x x x x
Uo>>> 59N-3 ROV1Inst x x x x
f1 81-1 Freq1St1 x x x x x x x
f2 81-2 Freq1St2 x x x x
SYNC1 25-1 SCVCSt1 x x
Is2t n< 48 MotStart x x
3I() 46R PREV3 x x
I2> 46-1 NPS3Low x x
I2>> 46-2 NPS3High x
3I< 37-1 NUC3St1 x
FUSEF 60 FuseFail x x
3Ithdev> 49M/G/T Tol3Dev x x x x
U1U2<>_1 47-1 PSV3St1 x x x