
152
6
F
2
S
0
8
5
0
IB1, IB2 and IB0 = positive, negative and zero sequence current at terminal B
Id1,Id2 and Id0 = positive, negative and zero sequence differential current
Z11, Z12 and Z10 are expressed by the following equations assuming that Zab = Zba, Zbc = Zcb
and Zca = Zac:
Z11 = (Zaa + Zbb + Zcc - Zab - Zbc - Zca)/3
Z12 = (Zaa + a
2
Zbb + aZcc + 2(aZab + Zbc + a
2
Zca))/3 (9)
Z10 = (Zaa + aZbb + a
2
Zcc - a
2
Zab - Zbc - aZca)/3
where, Zaa, Zbb and Zcc are self-impedances and Zab, Zbc and Zca are mutual impedances.
If Zaa = Zbb = Zcc and Zab = Zbc = Zca, then Z11 is equal to the positive sequence impedance,
and Z12 and Z10 are zero. For setting, the positive-sequence impedance is input using the
expression of the resistive component R1 and reactive component X1.
2.17.4.2 Fault location using the only local end data
The distance to fault
x
1
is calculated from equation (1) and (2) using the local voltage and current
of the fault phase and a current change before and after the fault occurrence. The current change
before and after the fault occurrence represented by I
β
" and I
α
" is used as the reference current.
The impedance imbalance compensation factor is used to maintain high measuring accuracy even
when the impedance of each phase has great variations.
Distance calculation for phase fault (in the case of BC-phase fault)
x
1
=
Im(Vbc
⋅
I
β
")
×
L
{Im(R1
⋅
Ibc
×
I
β
") + Re(X1
⋅
Ibc
⋅
I
β
")}
×
Kbc
(1)
where,
Vbc = fault voltage between faulted phases = Vb
−
Vc
Ibc = fault current between faulted phases = Ib
−
Ic
I
β
" = change of fault current before and after fault occurrence = (Ib-Ic)
−
(ILb-ILc)
ILb, ILc = load current
R1 = resistance component of line positive sequence impedance
X1 = reactance component of line positive sequence impedance
Kbc = impedance imbalance compensation factor
Im( ) = imaginary part in parentheses
Re( ) = real part in parentheses
L = line length (km)
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. ElectricalPartManuals
. com
Содержание GRL100-701B
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Страница 290: ... 289 6 F 2 S 0 8 5 0 Appendix B Signal List w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 324: ... 323 6 F 2 S 0 8 5 0 Appendix C Variable Timer List w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 348: ... 347 6 F 2 S 0 8 5 0 Appendix G Typical External Connection w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 388: ... 387 6 F 2 S 0 8 5 0 Appendix J Return Repair Form w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 394: ... 393 6 F 2 S 0 8 5 0 Appendix K Technical Data w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 410: ... 409 6 F 2 S 0 8 5 0 Appendix L Symbols Used in Scheme Logic w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 414: ... 413 6 F 2 S 0 8 5 0 Appendix M Multi phase Autoreclose w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 418: ... 417 6 F 2 S 0 8 5 0 Appendix N Data Transmission Format w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 424: ... 423 6 F 2 S 0 8 5 0 Appendix O Example of Setting w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 440: ... 439 6 F 2 S 0 8 5 0 Appendix Q IEC60870 5 103 Interoperability w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 454: ... 453 6 F 2 S 0 8 5 0 Appendix R Inverse Time Characteristics w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 464: ... 463 6 F 2 S 0 8 5 0 Appendix T PLC Setting Sample w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 468: ... 467 6 F 2 S 0 8 5 0 Appendix U Ordering w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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