ABB REX 521, Technical Reference Manual, Standard Configurations

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200
1MRS751802-MUM Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
Fig. 11.1.1.-2 Connection overview diagram of the incoming feeder
1
0
0
V
U
1
2
b
VT
1
Io
b
Io
CT
4
CT
5
5A 1A
1A 0.
2A
18 16 15 13 14 12 10 11
X1
.
1
RE
X
521
0 1
A N
L1 L3 L2
Overvi
e
wIncH05
X4
.
2
5
6
7
8
9
10
12
11
14
13
16
15
18
17
X3
.
1
2
1
X4
.
1
2
1
4
5
3
7
8
6
11
10
9
13
12
14
17
15
18
X4
.
2
3
4
1
2
DI1
DI2
D
I3
DI4
DI5
D
I6
DI7
D
I8
DI9
IRF
S01
S02
P
01
P02
P
03
HSPO1
TCS1
Mains
ACFail
TempAlarm
{
{ {
CB
DC
CLOSE circuit breaker
Circuit-breaker failure
protection
Internal relay fault
3I> -> TRIP2 to the
HV side circuit breaker
OC blocking signal
from the outgoing feeders
and the bus sectionalizer
to the 3I>>> stage
TRIP1 circuit breaker
OC blocking signal to the
3I>>> stages (3I>-> START)
OC blocking signal to the
HV-side 3I>> stage (3I>>-> START)
X2
.
1
DIFF
Sensor
VD
3
X2
.
2
DIFF
Sensor
VD
2
X2
.
3
DIFF
Sensor
VD
1
X2
.
4
DIFF
Sensor
R
S3
X2
.
5
DIFF
Sensor
R
S2
X2
.
6
DIFF
Sensor
R
S1
2
2
2
2
2
2
3I
>
6
7
f
P
3U
3
I
Q
E
pf
TC
S
CB
CM
0
I
MC
S
3I
~
har
m
000
R
CB
F
P
*
/6
2
U
0
3
I >
50/
51
SYN
C
2
5