Connection Of Analog Currents - ABB REC670 Applications Manual

1MRK 511 401-UEN A
17.8.3.1
Bay control REC670 2.2 IEC
Application manual
R +jX
1A 1A
DRPRDRE
LMBRFLO
ANSI05000045 V2 EN-US
Figure 213: Simplified network configuration with network data, required for
settings of the fault location-measuring function
For a single-circuit line (no parallel line), the figures for mutual zero-sequence
impedance (X , R ) and analog input are set at zero.
0M 0M
Power system specific parameter settings are not general settings but specific
setting included in the setting groups, that is, this makes it possible to change
conditions for the Fault locator with short notice by changing setting group.
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.

Connection of analog currents

Connection diagram for analog currents included IN from parallel line shown in
figure 214.
R +jX
0L 0L
R +jX
1L 1L
Z =Z +jX
0m 0m 0m
R +jX
0L 0L
R +jX
1L 1L
Section 17
Monitoring
R +jX
1B 1B
ANSI05000045_2_en.vsd
M13769-16 v5
503