⎯
413
⎯
6
F
2
S
0
8
4
6
=
8.23A
Element Setting
OCH 8.2
(A)
e. Breaker failure protection (BF)
The setting of the BF element should be lower than the minimum fault current:
OCBF < (Ifmin/CT ratio)
×
0.5
=
{(0.5
×
2.47kA)/(600/5)}
×
0.5
=
5.14A
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
Element Setting
OCBF 5.1
(A)
TBF1 70ms
TBF2 140ms
3.8 Undervoltage
element
a. Undervoltage element with current compensation (Phase selector)
(1) Undervoltage element (UVCV)
The UVCV element should be set not to work with the current of the power system.
UVCV < rated voltage
×
0.7
=
63.5V
×
0.7
=
44.5
(2) Reach setting (UVCZ)
The UVCZ element is set to the line impedance value:
UVCZ = 16.8
×
(0.0197
2
+ 0.2747
2
)
×
0.088
= 0.41 ohms
Element Setting
UVCV 45V
UVCZ 0.41
UVC
θ
85
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: ......