Connection Of Analog Currents - ABB Relion REC670 Applications Manual

Section 16
Monitoring
analog inputs are currents and next three are voltages in the observed bay (no parallel line
expected since chosen input is set to zero). Use the Parameter Setting tool within PCM600 for
changing analog configuration.
The measured phase voltages can be fine tuned with the parameters
UL3Gain to further increase the accuracy of the fault locator.
The list of parameters explains the meaning of the abbreviations. Figure
these system parameters graphically. Note, that all impedance values relate to their primary
values and to the total length of the protected line.
ANSI05000045 V2 EN-US
Figure 193: Simplified network configuration with network data, required for settings of
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
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.
16.8.3.1

Connection of analog currents

Connection diagram for analog currents included IN from parallel line shown in figure
398
R
0L
R
1L
R +jX
1A 1A
Z =Z
0m 0m
R
0L
R
1L
DRPRDRE
LMBRFLO
the fault location-measuring function
+jX
0L
+jX
1L
R +jX
1B
+jX
0m
+jX
0L
+jX
1L
ANSI05000045_2_en.vsd
UL1Gain , UL2Gain and
193 also presents
1B
Application manual
1MRK 511 358-UEN A
,
0M
M13769-16 v4
194