Siemens siprotec 7SJ63 - Page 290

Functions
6-126 7SJ63 Manual
C53000-G1140-C120-1
Figure 6-54 Logic Diagram for the Breaker Failure Protection
 75,37LPHU
 75,37LPHU
 %NU&O,0,1
50 BF int Pickup
&

I
a
, I
b
, I
c
S Q
R Q
>50BF ext SRC
or
52-a
52-b
=
&
or
2))
21
“1“
 )&7%)
>BLOCK 50BF
Measurement/Logic
50 BF BLOCK
50 BF OFF
or
Ι>
Max. of
T0
52 Configured 52-a
21
2))
„1“
 &KN%5.&217$&7
&
52 Configured 52-b
&
&
52 Configuration Error
&
&
&
&
or
Trip on Network Faults
&
&
50 BF int TRIP
I
a
, I
b
, I
c
Ι>
Max. of
&
T0
50 BF ext TRIP
50 BF ext Pickup
&
50 BF ACTIVE
) 
) 
) 
) 
) 
) 
) 
) 
) 
) 
) 
Internal Source
BF Trip
or
50 BF TRIP
) 
%NU&O,0,1
From Internal
Protection Functions
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