⎯
86
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6 F 2 S 0 8 4 6
Setting
The setting elements necessary for the breaker failure protection and their setting ranges are as
follows:
Element Range
Step Default Remarks
OCBF
0.5 – 10.0 A
0.1 A
4.0 A
Overcurrent setting
(0.1 - 2.0 A
0.1 A
0.8 A) (*)
TBF1
50 - 500 ms
1 ms
150 ms
Retrip timer
TBF2
50 - 500 ms
1 ms
200 ms
Related breaker trip timer
BFEXT OFF/ON
OFF
External
start
BF1 OFF/T/TOC OFF Retrip
mode
BF2
OFF/ON
OFF
Related breaker trip
(*) Current values shown in the parentheses are in the case of 1 A rating. Other current values are in
the case of 5 A rating.
The overcurrent element OCBF checks that the circuit breaker has opened and that the current has
disappeared. Therefore, since it is allowed to respond to load current, it can be set to 10 to 200% of
the rated current.
The settings of TBF1 and TBF2 are determined by the opening time of the original circuit breaker
(Tcb in Figure 2.4.11.2) and the reset time of the overcurrent element (Toc in Figure 2.4.11.2).
The timer setting example when using retrip can be obtained as follows.
Setting of TBF1 = Breaker opening time + OCBF reset time + Margin
= 40ms + 10ms + 20ms
=
70ms
Setting of TBF2 = TBF1 + Output relay operating time + Breaker opening time +
OCBF reset time + Margin
= 70ms + 10ms + 40ms + 10ms + 10ms
=
140ms
If retrip is not used, the setting of the TBF2 can be the same as the setting of the TBF1.
Summary of Contents for GRZ100 B Series
Page 264: ... 263 6 F 2 S 0 8 4 6 Appendix A Block Diagram ...
Page 271: ... 270 6 F 2 S 0 8 4 6 ...
Page 272: ... 271 6 F 2 S 0 8 4 6 Appendix B Signal List ...
Page 307: ... 306 6 F 2 S 0 8 4 6 ...
Page 308: ... 307 6 F 2 S 0 8 4 6 Appendix C Variable Timer List ...
Page 310: ... 309 6 F 2 S 0 8 4 6 Appendix D Binary Input Output Default Setting List ...
Page 321: ... 320 6 F 2 S 0 8 4 6 ...
Page 322: ... 321 6 F 2 S 0 8 4 6 Appendix E Details of Relay Menu and LCD Button Operation ...
Page 331: ... 330 6 F 2 S 0 8 4 6 ...
Page 340: ... 339 6 F 2 S 0 8 4 6 Appendix G Typical External Connections ...
Page 377: ... 376 6 F 2 S 0 8 4 6 ...
Page 384: ... 383 6 F 2 S 0 8 4 6 Appendix J Return Repair Form ...
Page 388: ... 387 6 F 2 S 0 8 4 6 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Page 389: ... 388 6 F 2 S 0 8 4 6 ...
Page 390: ... 389 6 F 2 S 0 8 4 6 Appendix K Technical Data ...
Page 401: ... 400 6 F 2 S 0 8 4 6 ...
Page 402: ... 401 6 F 2 S 0 8 4 6 Appendix L Symbols Used in Scheme Logic ...
Page 405: ... 404 6 F 2 S 0 8 4 6 ...
Page 406: ... 405 6 F 2 S 0 8 4 6 Appendix M Example of Setting Calculation ...
Page 417: ... 416 6 F 2 S 0 8 4 6 ...
Page 418: ... 417 6 F 2 S 0 8 4 6 Appendix N IEC60870 5 103 Interoperability and Troubleshooting ...
Page 434: ... 433 6 F 2 S 0 8 4 6 Appendix P Inverse Time Characteristics ...
Page 437: ... 436 6 F 2 S 0 8 4 6 ...
Page 438: ... 437 6 F 2 S 0 8 4 6 Appendix Q Failed Module Tracing and Replacement ...
Page 444: ... 443 6 F 2 S 0 8 4 6 Appendix R Ordering ...
Page 447: ......