ABB SPAS 348 C User Manual And Technical Description page 18

Example 2
Directional overcur-
rent and earth-fault
protection of a
feeder, resonant
earthed system
18
A
N
n
dn
a
da
U U U I
L1
12 23 31
U6
U
aux
X0/62
-
X0/61
U5
X0/63
Fig. 8. Feeder protection relay SPAS 348 C used for protecting a feeder in a resonant earthed
network
P1
S1
P2
S2
S1
P1
S2
P2
I I U I
L2 L3
0 0
U4
I , I
L1 L3
U1
(SPCS 4D11)
U , U
23 12
2I>
BS1/U1
BS2
RRES
I , I
L1 L2
U2
(SPCS 4D12)
U , U
23 31
2I>
BS1/U2
BS2
RRES
U3
(SPCS 2D26)
U
0
I
BS1/U3
BS2
RRES
SPAS 348 C
L1
L2
L3
0
I
+ +
I / O
IRF
IRF
SS1
SS2
SS3
SS1
TS1
TS2
SS2
I / O
IRF
SS1
SS2
SS3
SS3
TS1
TS2
SS4
I / O
IRF
TS1
SS1
SS2
SS3
SS4
TS2
TS1
TS2
TS3
TS4
TS3
I / O
TS4
-
0
-
I
SERIAL
PORT
X2/14
X2/15
X2/16
+
X2/12
+
X2/13
+
BLOCK
X2/9
X2/10
X2/11
+
CBFAIL
X2/7
X2/8
+
OC alarm
X2/5
X2/6
+
EF alarm
X2/3
+
X2/4
CBFP
+
X2/1
+
X2/2
+
X1/15
X1/16
+
X1/11
X1/12
X1/13
X1/14
+
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