Table 65. Fault locator (SCEFRFLO)
Characteristic Value
Operation accuracies At the frequency f = f
n
Current: ±1.5% of the set value or ±0.002 × I
n
Voltage: ±1.5% of the set value or ±0.002 × U
n
Fault location accuracy: ±2.5% of the line
length
Actual fault location accuracy depends on
the fault and the power system characteristics.
Suppression of harmonics DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,
…
Table 66. Fault locator (SCEFRFLO) main settings
Parameter
Function Values (Range) Step
Phase voltage Meas SCEFRFLO Accurate PP without
Uo
-
Calculation Trg mode SCEFRFLO External Internal
Continuous
-
Pre fault time SCEFRFLO 0.100...300.000 s 0.001
Z Max phase load SCEFRFLO 1.00...10000.00 ohm 0.01
Ph leakage Ris SCEFRFLO 1...1000000 ohm 1
Ph capacitive React SCEFRFLO 1...1000000 ohm 1
R1 line section A SCEFRFLO 0.001...1000.000
ohm/pu
0.001
X1 line section A SCEFRFLO 0.001...1000.000
ohm/pu
0.001
R0 line section A SCEFRFLO 0.001...1000.000
ohm/pu
0.001
X0 line section A SCEFRFLO 0.001...1000.000
ohm/pu
0.001
Line Len section A SCEFRFLO 0.001...1000.000 pu 0.001
Feeder Protection and Control 1MRS756380 A
REF630
Product version: 1.0 Issued: 15.09.2009
46 ABB
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