β‘ TRANSMISSION LINE FAULT LOCATOR
Impedance-Based Algorithms | IEEE C37.114 | One-Ended & Two-Ended Methods
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π Line Parameters
β
Line Name
Length (km)
R1 (Ξ©/km)
X1 (Ξ©/km)
R0 (Ξ©/km)
X0 (Ξ©/km)
Tower Configuration
Local Tower
Remote Tower
Tolerance (%)
Source Impedances (for Eriksson/Mod.Takagi)
ZG1 (Ξ©) R
ZG1 (Ξ©) X
ZH1 (Ξ©) R
ZH1 (Ξ©) X
ZG0 (Ξ©) R
ZG0 (Ξ©) X
ZH0 (Ξ©) R
ZH0 (Ξ©) X
β‘ Fault Options
β
Fault Type
A-G
B-G
C-G
AB
BC
CA
AB-G
BC-G
CA-G
3Ξ¦
Sequence for 2-Ended (Unbal.)
Neg-Seq
Pos-Seq (3Ξ¦)
βΉ Method Reference
β
Simple Reactance:
Uses Im(VG/IG)/Im(ZL1). Fast but sensitive to load and RF.
Takagi:
Uses pure-fault current ΞIG to subtract load. Sensitive to non-homogeneity.
Mod. Takagi:
Uses IG0 instead of ΞIG. Corrects for non-homogeneity via angle Ξ².
Eriksson:
Quadratic solution. Robust to RF, load, and non-homogeneity. Also estimates RF.
Novosel et al.:
Eriksson variant for radial lines with lumped load at end.
Sync. Two-Ended:
Neg-seq (unbal.) or pos-seq (3Ξ¦). GPS-synchronized data. Best accuracy.
Unsync. Two-Ended:
Quadratic, no GPS needed. Uses |ejΞ΄|=1 to eliminate sync operator.
Current-Only 2E:
No voltage phasors needed. Uses neg-seq currents + source impedances.
Local Station β Phasor Inputs
β
Station Name
Prefault I (A) mag
Magnitude
Angle (Β°)
VA
VB
VC
IA
IB
IC
Prefault (for Takagi / Eriksson):
IAβ
IBβ
ICβ
VAβ
Remote Station β Phasor Inputs [Two-Ended Only]
β
Station Name
Magnitude
Angle (Β°)
VA
VB
VC
IA
IB
IC
π Line Diagram & Fault Location
β
π Fault Location Results
Configure inputs and click βΆ Calculate All
π FAULT LOCATION REPORT
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