ABB Relion 670 Series Applications Manual page 476

Section 17
Monitoring
The source impedance is not constant in the network. However, this has a minor influence on the
accuracy of the distance-to-fault calculation, because only the phase angle of the distribution
factor has an influence on the accuracy. The phase angle of the distribution factor is normally very
low and practically constant, because the positive sequence line impedance, which has an angle
close to 90°, dominates it. Always set the source impedance resistance to values other than zero. If
the actual values are not known, the values that correspond to the source impedance
characteristic angle of 85° give satisfactory results.
17.8.3.1 Connection of analog currents
Connection diagram for analog currents included IN from parallel line shown in figure 219.
A
B
C
ANSI07000113 V2 EN-US
Figure 219: Example of connection of parallel line IN for Fault locator LMBRFLO
17.9 Limit counter L4UFCNT
470
1
I1 I1
2
3
I2 I2
4
5
I3 I3
6
9
I5 I5
10
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en07000113_1_ansi.v
sd
1MRK 511 401-UUS F
M13769-16 v5
GUID-22E141DB-38B3-462C-B031-73F7466DD135 v1
Bay control REC670
Application manual