ABB REL650 series, Technical Manual

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Name Values (Range) Unit Step Default Description
DrepChNoV_A 1 - 30 Ch 1 5 Recorder Input number recording phase
voltage, VA
DrepChNoV_B 1 - 30 Ch 1 6 Recorder Input number recording phase
voltage, VB
DrepChNoV_C 1 - 30 Ch 1 7 Recorder Input number recording phase
voltage, VC
14.14.6 Monitored data
Table 493: 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 0=---
1=L1-N
2=L2-N
3=L3-N
4=L1-L2
5=L2-L3
6=L3-L1
7=L1-L2-L3
- Fault loop
14.14.7 Operation principle
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.
1MRK 506 335-UUS A
Section 14
Monitoring
665
Technical manual