⎯
97
⎯
6
F
2
S
0
8
3
5
Figure 2.13.2.2 Three-terminal Model
χ
A = (VA
−
VB + ZA(IB + IC) + ZBIB ) / ZAId (5)
χ
JB = (VA
−
VB + ZBIB
−
ZAIA) / ZBId (6)
χ
JC = (VA
−
VC + ZCIC
−
ZAIA) / ZCId (7)
where, Id = IA + IB + IC
VC = voltage at terminal C
IC = current at terminal C
χ
A = distance from terminal A to fault point as a ratio to line length from
terminal A to junction
χ
JB,
χ
JC = distance from junction to fault point as a ratio to line length
from junction to terminal B or C
ZA, ZB, ZC = impedance from each terminal to junction
Firstly,
χ
A is calculated using Equation (5) assuming that the fault is between terminal A and the
junction. If the result does not match the input line data, then
χ
JB is calculated using Equation
(6) assuming that the fault is between the junction and terminal B. If the result does not match the
input line data, the calculation is repeated using Equation (7) assuming that the fault is between
the junction and terminal C.
Calculation Method
In the GRL100 calculation, the sequence quantities of voltages and currents are employed
instead of the phase quantities. Thus, equation (4) is combined with Equation (8) to give:
χ
=
V
V
Z I
Z I
Z I
Z I
d
Z I
d
Z I
d
A
B
B
B
B
1
1
11
1
12
2
10
0
11
1
12
2
10
0
−
+
+
+
+
+
(
)
(8)
where, VA1 = positive sequence voltage at terminal A
VB1 = positive sequence voltage at terminal B
Terminal A
Terminal B
Terminal C
VA
Junction
IA
VB
ZC
IC
ZA
VC, IC
ZB
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: ......