Fault Locator Lmbrflo - ABB REL650 series Technical Manual

Section 14
Monitoring
14.14
14.14.1
14.14.2
662
Table 488: 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 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 great accuracy. It
indicates the distance to fault in kilometers or miles as selected by parameter setting.
The fault locator LMBRFLO function, supports kilometer and mile for the
line length unit. The fault distance will be presented with the same unit as
the line length and is mapped to IEC61850 -8-1 communication protocol,
where the fault distance is supposed to be in kilometer (km). Select the line
length unit to kilometer for compliance with IEC61850.
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 as a
relative (in%) or an absolute value. 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
between low‐ between low
low and low and high limit
limit
High
High
IEC 61850 IEC 60617
identification identification
LMBRFLO -
1MRK 506 335-UUS A
between high- above high-high
high and high limit
limit
High
High
ANSI/IEEE C37.2
device number
-
Technical manual