Breaker Failure Protection Scheme Logic; Sequence Diagram - Toshiba GRE110 Instruction Manual

[BTC]
+
"ON"
82
A
83
B
CBF
84
C
EXT TRIP-APH
≥1
EXT TRIP-BPH
≥1
EXT TRIP-CPH
≥1
EXT TRIP3PH
+
CBF INIT
Figure 2.8.1 Breaker Failure Protection Scheme Logic
Fault
Start CBFP
Adjacent
breakers
Closed
TRIP
Original
breakers
Closed
OCBF
TRTC
CBF
RETRIP
TBTC
CBF
TRIP
187
&
188
&
189
&
&
&
&
&
&
&
[RTC]
"OC"
"DIR"
Normal trip
Open
T cb Tcb
Toc
TRTC
TBTC
Figure 2.8.2 Sequence Diagram
 44 
TBTC
0
t
0
t
0
t
0.00 - 300.00s
TRTC
0
t
≥1
0
t
≥1
t 0
≥1
0.00 - 300.00s
Trip
Open
Retrip
Open
Toc
6 F 2 T 0 1 7 2
140
≥ 1
CBF TRIP
139
≥ 1
CBF RETRIP