ABB Relion 670 Series Applications Manual page 503

1MRK 511 401-UEN Rev. K
The distance to fault can be recalculated on the local HMI by using the measuring algorithm for
different fault loops or for changed system parameters.
18.8.4 Setting guidelines
The parameters for the Fault locator function are set via the local HMI or PCM600.
The Fault locator algorithm uses phase voltages, phase currents and residual current in
observed bay (protected line) and residual current from a parallel bay (line, which is mutual
coupled to protected line).
The Fault locator has close connection to the Disturbance report function. All external analog
inputs (channel 1-30), connected to the Disturbance report function, are available to the Fault
locator and the function uses information calculated by the Trip value recorder. After
allocation of analog inputs to the Disturbance report function, the user has to point out which
analog inputs to be used by the Fault locator. According to the default settings the first four
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.
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 247: 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.
Bay control REC670
Application manual
R
0L
R
1L
R +jX
1A 1A
Z =Z
0m 0m
R
0L
R
1L
DRPRDRE
LMBRFLO
the fault location-measuring function
© Copyright 2017 Hitachi Power Grids. All rights reserved
+jX
0L
+jX
1L
R +jX
1B
+jX
0m
+jX
0L
+jX
1L
ANSI05000045_2_en.vsd
UL1Gain , UL2Gain , and
Figure 247 also presents
1B
Section 18
Monitoring
IP14835-1 v1
M13769-3 v7
,
0M
497