⎯
53
⎯
6
F
2
S
0
8
3
5
The backtrip signal to the adjacent breakers CBF-TRIP is output if the overcurrent element
OCBF operates continuously for the setting time of the delayed pick-up timer TBF2 after the
start-up. Tripping of the adjacent breakers can be blocked with the scheme switch [BF2].
There are two kinds of mode of the retrip signal to the original breaker RETRIP: the mode in
which RETRIP is controlled by the overcurrent element OCBF, and the direct trip mode in
which RETRIP is not controlled. The retrip mode together with the trip block can be selected
with the scheme switch [BF1].
Figure 2.7.2 shows a sequence diagram of the BFP when a retrip and backtrip are used. If the
breaker trips normally, the OCBF is reset before timer TBF1 or TBF2 is picked up and the BFP
is reset.
If the OCBF continues operating, a retrip command is given to the original breaker after the
setting time of TBF1. Unless the breaker fails, the OCBF is reset by the retrip. The TBF2 is not
picked up and the BFP is reset. This may happen when the BFP is started by mistake and
unnecessary tripping of the original breaker is unavoidable.
If the original breaker fails, retrip has no effect and the OCBF continues operating and the TBF2
is picked up finally. A trip command CBF-TRIP is issued to the adjacent breakers and the BFP is
completed.
Fault
CBF
-
TRIP
TBF2
RETRIP
TBF1
OCBF
Original
breaker
Adjacent
breakers
TRIP
Retrip
Toc
Toc
Tcb
T cb
TBF1
TBF2
Normal trip
Trip
Open
Closed
Start BFP
Open
Open
Closed
Tcb: operating time of the original breaker
Toc: reset time of the overcurrent element OCBF
Figure 2.7.2 Sequence Diagram
Summary of Contents for GRL100-101A
Page 223: ... 222 6 F 2 S 0 8 3 5 ...
Page 228: ... 227 6 F 2 S 0 8 3 5 Appendix B Signal List ...
Page 256: ... 255 6 F 2 S 0 8 3 5 Appendix C Variable Timer List ...
Page 258: ... 257 6 F 2 S 0 8 3 5 Appendix D Binary Output Default Setting List ...
Page 269: ... 268 6 F 2 S 0 8 3 5 ...
Page 270: ... 269 6 F 2 S 0 8 3 5 Appendix E Details of Relay Menu ...
Page 279: ... 278 6 F 2 S 0 8 3 5 ...
Page 288: ... 287 6 F 2 S 0 8 3 5 Appendix G Typical External Connection ...
Page 326: ... 325 6 F 2 S 0 8 3 5 Appendix J Return Repair Form ...
Page 330: ... 329 6 F 2 S 0 8 3 5 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Page 331: ... 330 6 F 2 S 0 8 3 5 ...
Page 332: ... 331 6 F 2 S 0 8 3 5 Appendix K Technical Data ...
Page 343: ... 342 6 F 2 S 0 8 3 5 ...
Page 344: ... 343 6 F 2 S 0 8 3 5 Appendix L Symbols Used in Scheme Logic ...
Page 347: ... 346 6 F 2 S 0 8 3 5 ...
Page 348: ... 347 6 F 2 S 0 8 3 5 Appendix M Multi phase Autoreclose ...
Page 351: ... 350 6 F 2 S 0 8 3 5 ...
Page 352: ... 351 6 F 2 S 0 8 3 5 Appendix N Data Transmission Format ...
Page 358: ... 357 6 F 2 S 0 8 3 5 Appendix O Example of DIF and DIFG Setting ...
Page 364: ... 363 6 F 2 S 0 8 3 5 Appendix Q IEC60870 5 103 Interoperability ...
Page 377: ... 376 6 F 2 S 0 8 3 5 ...
Page 378: ... 377 6 F 2 S 0 8 3 5 Appendix R Failed Module Tracing and Replacement ...
Page 384: ... 383 6 F 2 S 0 8 3 5 Appendix S PLC Setting Sample ...
Page 386: ... 385 6 F 2 S 0 8 3 5 Appendix T Ordering ...
Page 392: ......