Figure 4.7 Simplified Logic Diagram Of The Differential Protection - Siemens SIPROTEC 7SD600 System Manual

4
Method of operation
Numerical line differential protection SIPROTEC 7SD600 V3.0
3003
>DIF.blk
3008
>Res.LO
I = I + I
diff 1
I
1
Current
calculation I =
stab
I + I
1 2
I
I , I , I
a
1 diff stab
I
1

Figure 4.7 Simplified logic diagram of the differential protection

4 - 10
P 10 DIFPRO
on - off - signal only
Control logic
P 01L.Out P 01L.O.Fr
on-off
Lockout
I
diff
I
stab
2
P 10 DIFPRO
DIF.st
P 10 I1>Frg,
I1 Frg
I
dif
I
stab
P 10Harm2%
2 Harm
on-off
P 10 2 HARM
I Harm 2
P 10 Harm2I
P 10 I-Spc
Spill current
System manual Order no. E50417-G1176-C069-A1
KEY; BI; KEY BI
P
10T del
T
& &
&
0 T
1 s
&
P
10T-Spc
T 0
&
3015
DIF.off
3016
DIF.blk
3017
DIF.wrk
to pilot wire
monitoring function
3031
Lockout
3021
DEL.st
3027
0
1

DIF OFF
3022
DIF GA
3024
B.DIF S
3026
B.DIF.H
3030
B.DIF.D
Siemens AG January 1999