1MRS751802-MUM
REX 521
205
Protection Relay
Technical Reference Manual, Standard Configurations
Fig. 11.2.1.-2
Connection overview diagram of the incoming feeder
RE
X
521
0
1
1
0
0
V
U
o
A
N
L
1
L
3
L
2
Overvi
e
wIncH05
1
0
0
V
U
1
2
1
0
0
V
U
2
3
1
0
0
V
U
3
1
VT
1
CT
1
VT
2
VT
3
VT
4
I
o
b
I
o
I
L
1
I
L
2
I
L
3
CT
2
CT
3
CT
4
CT
5
5
A
1
A
5
A
1
A
5
A
1
A
5
A
1
A
1
A
0
.
2
A
2
7
2
5
2
4
2
2
2
1
1
9
1
8
1
6
1
5
1
3
1
4
1
2
1
0
1
1
9
7
8
6
4
5
3
1
2
X
1
.
1
X
4
.
2
5
6
7
8
9
1
0
1
2
1
1
1
4
1
3
1
6
1
5
1
8
1
7
X
3
.
1
2
1
X
4
.
1
2
1
4
5
3
7
8
6
1
1
1
0
9
1
3
1
2
1
4
1
7
1
5
1
8
X
4
.
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
P1
P2
S1
S2
3I
>
6
7
f
P
3U
3
I
Q
E
pf
TC
S
CB
CM
0
I
MC
S
3I
~
h
a
r
m
000
R
3U
~
h
a
r
m
CB
F
P
*
/
6
2
U
0
3I
>
50/
51
OC blocking signal to the
3I>> stages (3I>-> START)
OC blocking signal to the
HV-side 3I>> stage (3I> START)
Summary of Contents for REX 521
Page 1: ...Protection Relay REX 521 Technical Reference Manual Standard Configurations ...
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