ABB REL650 Technical Manual page 628

Section 14
Monitoring
14.9
14.9.1
14.9.2
622
Table 436: Input integer value converted to binary output signals
Measured supervised below low-low
value is: limit
Output:
LOWLOW High
LOW
NORMAL
HIGH
HIGHHIGH
Fault locator LMBRFLO
Identification
Function description
Fault locator
Functionality
The accurate fault locator is an essential component to minimize the outages after a
persistent fault and/or to pin-point a weak spot on the line.
The fault locator is an impedance measuring function giving the distance to the
fault in km, miles or % of line length. The main advantage is the high accuracy
achieved by compensating for load current and for the mutual zero-sequence effect
on double circuit lines.
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 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.
between low‐ between low
low and low and high limit
limit
High
High
IEC 61850 IEC 60617
identification identification
LMBRFLO -
Line distance protection REL650 2.2 IEC
1MRK 506 382-UEN A
between high- above high-
high and high high limit
limit
High
High
IP14592-1 v2
M14892-1 v3
ANSI/IEEE C37.2
device number
-
M13970-3 v13
Technical manual