
⎯
135
⎯
6 F 2 S 0 8 4 6
Distance calculation for earth fault (in the case of A-phase earth fault)
x
1
=
I
m
(V
a
⋅
I
α
")
×
L
{I
m
(R
1
⋅
I
α
⋅
I
α
" + R
0
⋅
I
0S
⋅
I
α
" + R
0m
⋅
I
0m
⋅
I
α
") + R
e
(X
1
⋅
I
α
⋅
I
α
" + X
0
⋅
I
0S
⋅
I
α
" + X
0m
⋅
I
0m
⋅
I
α
")}
×
K
a
where,
Va = fault voltage
I
α
= fault current = (2Ia
−
Ib
−
Ic)/3
I
α
" = change of fault current before and after fault occurrence
=
2Ia
−
Ib
−
Ic
3
−
2ILa
−
ILb
−
ILc
3
Ia, Ib, Ic = fault current
ILa, ILb, ILc = load current
I0s = zero sequence current
I0m = zero sequence current of parallel line
R1 = resistance component of line positive sequence impedance
X1 = reactance component of line positive sequence impedance
R0 = resistance component of line zero sequence impedance
X0 = reactance component of line zero sequence impedance
R0m = resistance component of line mutual zero sequence impedance
X0m = reactance component of line mutual zero sequence impedance
Ka = impedance imbalance compensation factor
Im( ) = imaginary part in parentheses
Re( ) = real part in parentheses
L = line length (km)
Equations (1) and (2) are general expressions when lines are treated as having lumped constants
and these expressions are sufficient for lines within 100 km. For lines exceeding 100 km,
influences of the distributed capacitance must be considered. For this fault locator, the following
equation is used irrespective of line length to find the compensated distance
x
2
with respect to
distance
x
1
which was obtained in equation (1) or (2).
x
2
=
x
1
−
k
2
⋅
x
1
3
3 (3)
where,
k = propagation constant of the protected line = 0.001km
-1
(fixed)
2.7.3 Starting
Calculation
Calculation of the fault location is initiated by one of the following tripping signals.
•
command protection trip
•
zone 1 trip
•
zone 2 trip
•
zone 3 trip
(2)
Содержание GRZ100 B Series
Страница 264: ... 263 6 F 2 S 0 8 4 6 Appendix A Block Diagram ...
Страница 271: ... 270 6 F 2 S 0 8 4 6 ...
Страница 272: ... 271 6 F 2 S 0 8 4 6 Appendix B Signal List ...
Страница 307: ... 306 6 F 2 S 0 8 4 6 ...
Страница 308: ... 307 6 F 2 S 0 8 4 6 Appendix C Variable Timer List ...
Страница 310: ... 309 6 F 2 S 0 8 4 6 Appendix D Binary Input Output Default Setting List ...
Страница 321: ... 320 6 F 2 S 0 8 4 6 ...
Страница 322: ... 321 6 F 2 S 0 8 4 6 Appendix E Details of Relay Menu and LCD Button Operation ...
Страница 331: ... 330 6 F 2 S 0 8 4 6 ...
Страница 340: ... 339 6 F 2 S 0 8 4 6 Appendix G Typical External Connections ...
Страница 377: ... 376 6 F 2 S 0 8 4 6 ...
Страница 384: ... 383 6 F 2 S 0 8 4 6 Appendix J Return Repair Form ...
Страница 388: ... 387 6 F 2 S 0 8 4 6 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Страница 389: ... 388 6 F 2 S 0 8 4 6 ...
Страница 390: ... 389 6 F 2 S 0 8 4 6 Appendix K Technical Data ...
Страница 401: ... 400 6 F 2 S 0 8 4 6 ...
Страница 402: ... 401 6 F 2 S 0 8 4 6 Appendix L Symbols Used in Scheme Logic ...
Страница 405: ... 404 6 F 2 S 0 8 4 6 ...
Страница 406: ... 405 6 F 2 S 0 8 4 6 Appendix M Example of Setting Calculation ...
Страница 417: ... 416 6 F 2 S 0 8 4 6 ...
Страница 418: ... 417 6 F 2 S 0 8 4 6 Appendix N IEC60870 5 103 Interoperability and Troubleshooting ...
Страница 430: ... 429 6 F 2 S 0 8 4 6 Appendix O Programmable Reset Characteristics and Implementation of Thermal Model to IEC60255 8 ...
Страница 434: ... 433 6 F 2 S 0 8 4 6 Appendix P Inverse Time Characteristics ...
Страница 437: ... 436 6 F 2 S 0 8 4 6 ...
Страница 438: ... 437 6 F 2 S 0 8 4 6 Appendix Q Failed Module Tracing and Replacement ...
Страница 444: ... 443 6 F 2 S 0 8 4 6 Appendix R Ordering ...
Страница 447: ......