The compensation includes setting of the remote and local sources and calculation of
the distribution of fault currents from each side. This distribution of fault current,
together with recorded load (pre-fault) currents, is used to exactly calculate the fault
position. The fault can be recalculated with new source data at the actual fault to
further increase the accuracy.
Especially on heavily loaded long lines (where the fault locator is most important)
where the source voltage angles can be up to 35-40 degrees apart the accuracy can be
still maintained with the advanced compensation included in fault locator.
12.13.3 Function block
ANSI09000621-2-en.vsd
LMBRFLO
PHSEL_A*
PHSEL_B*
PHSEL_C*
CALCDIST*
CALCMADE
FLTDISTX
BCD_80
BCD_40
BCD_20
BCD_10
BCD_8
BCD_4
BCD_2
BCD_1
ANSI09000621 V2 EN
Figure 120: LMBRFLO function block
12.13.4 Signals
Table 243: LMBRFLO Input signals
Name
Type Default Description
PHSEL_A BOOLEAN 0 Phase selection phase A
PHSEL_B BOOLEAN 0 Phase selection phase B
PHSEL_C BOOLEAN 0 Phase selection phase C
CALCDIST BOOLEAN 0 Input signal to initiate fault distance calculation
Table 244: LMBRFLO Output signals
Name
Type Description
CALCMADE BOOLEAN Fault calculation made
FLT_X REAL Reactive distance to fault
BCD_80 BOOLEAN Distance in binary coded data, bit represents 80%
BCD_40 BOOLEAN Distance in binary coded data, bit represents 40%
Table continues on next page
Section 12 1MRK 505 277-UUS C
Monitoring
300
Technical Manual
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