⎯
406
⎯
6
F
2
S
0
8
4
6
1. Power System Data
[Example system]
•
Line impedance of A s/s - Bs/s
- Positive sequence impedance: 0.0197 + j0.2747 (ohms/km)
- Zero sequence impedance:
0.4970 + j1.4387 (ohms/km)
- Mutual impedance:
0.0212 + j0.3729 (ohms/km)
•
Back
impedance
- A s/s: 0.94 (%pu) at 100MVA base
- B s/s: 0.94 (%pu) at 100MVA base
•
Normal load current:
594.7A
•
Minimum fault current: 2.05kA
2. Relay Setting
- Relay
application:
Relay type:
GRZ100-201
Protection scheme: BOP (Blocking overreach protection), 3 zone time-stepped distance
protection
Autoreclose mode: 1 + 3
3. Setting Calculation
3.1
Normal load current
To calculate load current, back impedance is converted from a percent unit value to an
impedance value.
Base impedance Zbase = (Vbase)
2
/VAbase
=
(150kV/ 3 )
2
/100MVA
= 75 ohms
CT: 600/5A
VT: 150kV/ 3 : 110V/ 3
Line length: 16.8km
B s/s
A s/s
CT: 600/5A
VT: 150kV/ 3 : 110V/ 3
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: ......