ABB RELION 650 SERIES, Technical Manual

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14.9.6 Monitored data
PID-3906-MONITOREDDATA v1
Table 441: LMBRFLO Monitored data
Name Type Values (Range) Unit Description
FLT_REL REAL - - Distance to fault, relative
FLT_DIST REAL - - Distance to fault in line
length unit
FLT_X REAL - Ohm Reactive distance to
fault
FLT_R REAL - Ohm Resistive distance to
fault
FLT_LOOP INTEGER 1=L1-N
2=L2-N
3=L3-N
4=L1-L2
5=L2-L3
6=L3-L1
7=Others
- Fault loop
14.9.7 Operation principle
M14982-4 v7
The Fault locator (LMBRFLO) in the IED is an essential complement to other
monitoring functions, since it measures and indicates the distance to the fault with
high accuracy.
When calculating distance to fault, pre-fault and fault phasors of currents and
voltages are selected from the Trip value recorder data, thus the analog signals used
by the fault locator must be among those connected to the disturbance report
function. The analog configuration (channel selection) is performed using the
parameter setting tool within PCM600.
The calculation algorithm considers the effect of load currents, double-end infeed
and additional fault resistance.
Z
0m
=Z
0m
+jX
0m
R
1A
+jX
1A
R
0L
+jX
0L
R
1L
+jX
1L
R
0L
+jX
0L
R
1L
+jX
1L
R
1B
+jX
1B
IEC05000045_2_en.vsd
LMBRFLO
DRPRDRE
IEC05000045 V2 EN-US
Figure 317: Simplified network configuration with network data, required for
settings of the fault location-measuring function
1MRK 506 382-UEN A
Section 14
Monitoring
Line distance protection REL650 2.2 IEC 625
Technical manual