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I
, I
, I
L1
L2
L3
I
2
Power
swing
Z
1
logic
see Section 2.17.3
7UM62 Manual
C53000-G1176-C149-3
A drop-out can only be caused by a drop-out of the overcurrent pickup and not by
leaving the tripping polygon.
Figure 2-61 illustrates the logic diagram of the impedance protection.
FNo. 03966
Imp. picked up
3310 ZONE Z2
3306 ZONE Z1
Z
3308 ZONE Z1B
U
I
U
,U
,U
L1
L2
L3
I
,I
,I
Loop
L1
L2
L3
selection
FNo. 3967
Imp. Fault L1
U
1
FNo. 3968
I
,I
,I
L1
L2
L3
Imp. Fault L2
FNo. 3969
Imp. Fault L3
FNo. 3970
Pickup
Imp I> & U< PU
FNo. 3958
>Useal-in BLK
3315 BLOCKING OF
Z1
„1"
Z1 and Z2
FNo. 3976
Power Swing
FNo. 0361
>FAIL:Feeder V
see Figure 2-120 in
Section 2.38.1.4
FFM
FNo. 3956
>Extens. Z1B
FNo. 3953
>Imp. BLOCK
Figure 2-61
Logic Diagram of the Impedance Protection
3312 T END
3311 ZONE2 T2
&
3307 T-Z1
&
3309 T-Z1B
&
&
OR
FNo. 3962
Imp. BLOCKED
Impedance Protection (ANSI 21)
S
Q
R
S
Q
R
S
Q
R
FNo. 3977
Imp.Z1<TRIP
FNo. 3979
Imp.Z2<TRIP
Tripping
matrix
FNo. 3978
Imp.Z1B<TRIP
FNo. 3980
Imp.T3>TRIP
TMin
TRIP CMD
127
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