
148
6
F
2
S
0
8
3
4
2.8.4.2 Fault location using the local and remote end data
Calculation Principle
In the case of a two-terminal line as shown in Figure 2.8.4.1, the relationship between the voltages
at the local and remote terminals and the voltage at the fault point are expressed by Equations (1)
and (2).
VA
IA
VB
Z
IB
χ
1
−
χ
Terminal A
Terminal B
Fault
Vf
Figure 2.8.4.1 Two-terminal Model
VA -
χ
Z IA = Vf (1)
VB - (1 -
χ
)Z IB = Vf (2)
where,
VA = voltage at terminal A
IA = current at terminal A
VB = voltage at terminal B
IB = current at terminal B
χ
= distance from terminal A to fault point as a ratio to line length
Vf = voltage at fault point
Z
= line impedance
The distance
χ
is given by Equation (3) by eliminating Vf,
χ
= (VA - VB + ZIB) /Z(IA + IB) (3)
As (IA + IB ) is equal to differential current Id,
χ
is calculated with the differential current
obtained as follows:
χ
= (VA - VB + ZIB) /ZId (4)
The distance calculation principle mentioned above can be applied to three-terminal lines. But in
case of three-terminal application, the distance measurement equation varies according to which
zone the fault is in, this side or beyond the junction. Terminal A measures the distance using
Equations (5), (6) or (7).
Terminal A
Terminal B
VA
Junction
IA
VB
IC
ZA
ZB
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Содержание GRZ100-211B
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Страница 324: ... 323 6 F 2 S 0 8 3 4 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 352: ... 351 6 F 2 S 0 8 3 4 Appendix G External Connections 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 390: ... 389 6 F 2 S 0 8 3 4 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 ...
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Страница 396: ... 395 6 F 2 S 0 8 3 4 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 408: ... 407 6 F 2 S 0 8 3 4 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 412: ... 411 6 F 2 S 0 8 3 4 Appendix M Example of Setting Calculation 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 448: ... 447 6 F 2 S 0 8 3 4 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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