ABB REX 521 - Page 221

1MRS751802-MUM
REX 521
221
Protection Relay
Technical Reference Manual, Standard Configurations
Fig. 11.5.1.-2 Connection overview diagram of the incoming feeder
REX 521
0 1
100V
Uo
A
N
L1
L3 L2
OverviewIncH05
100V
U12
100V
U23
100V
U31
VT1
CT1
VT2 VT3
VT4
Iob
Io
IL1
IL2
IL3
CT2
CT3
CT4
CT5
5A 1A
5A 1A
5A 1A 5A 1A
1A 0.2A
27
25
24
22
21
19
18
16
15
13
14
12
10
11
9
7
8
6
4
5
3
1
2
X1.1
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 DI3
DI4
DI5 DI6
DI7 DI8 DI9
IRF
S01
S02 P01
P02 P03 HSPO1
TCS1
Mains
ACFail
TempAlarm
CB
DC
3U< 27
3U>
59
3I >
50/51
f
P
3U
3I
Q
E
pf
TCS
CBCM
0
I
MCS
3I~harm
000
R
3U~harm
CBFP
*/62
I >
0
50N/51N
I
0
CLOSE circuit breaker
1
0
Circuit-breaker failure
protection
Internal relay fault
Io>>> TRIP to breaker on
HV side of transformer
OC blocking signal
from the outgoing feeders
to the 3I>>> stage
OC blocking signal to
the HV relay (3I>> START)
TRIP circuit breaker
P1
P2
S1
S2
S1
S2