ABB RED650, Technical Manual

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Table 411: Input integer value converted to binary output signals
Measured supervised
value is:
below low-low
limit
between low‐
low and low
limit
between low
and high limit
between high-
high and high
limit
above high-
high limit
Output:
LOWLOW High
LOW High
NORMAL High
HIGH High
HIGHHIGH High
15.9 Fault locator LMBRFLO
IP14592-1 v2
15.9.1 Identification
M14892-1 v3
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fault locator LMBRFLO - -
15.9.2 Functionality
M13970-3 v13
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.
Section 15
1MRK 505 394-UEN A
Monitoring
590 Line differential protection RED650 2.2 IEC
Technical manual