R(Ohm)
X(Ohm)
1+2+3
2
1
3
IEC15000300-1-en.vsdx
IEC15000300 V1 EN-US
Figure 166: R-X diagram showing positive sequence impedances of three line
sections
The fault locator (RWRFLO) is started with the input CALCDIST to which trip
signals indicating in-line faults are connected, typically distance protection zone 1
and accelerating zone or the line differential protection. Disturbance report must
also be started for the same faults since the function uses pre-fault and fault
information from the trip value recorder function (TVR).
Besides this, the function must be informed about faulted phases for correct loop
selection (phase-selective outputs from distance protections, directional over-
current protection and so on). The following loops are used for different types of
faults:
• For two-phase faults: loop L1-L2
• For phase-to-earth faults: L1N, L2N : phase-to-earth loop
RWRFLO function indicates distance-to-faults as a percentage of the line length
and in kilometres. The calculated distance-to-fault is stored together with the
recorded disturbances. Information can be read on the local HMI or uploaded to
PCM600. Is also available on the station bus according to IEC 61850-8-1.
Distance-to-fault can be recalculated on the local HMI by using the measuring
algorithm for different fault loops.
15.10.3 Setting guidelines
GUID-5D8395B5-92CF-4326-B421-19A635725B36 v1
In RWRFLO, the setting NrOfSections is set according to the number of sections
available in the transmission line. The maximum number of sections in the fault
locator is ten.
1MRK 506 375-UEN A Section 15
Monitoring
Railway application RER670 2.2 IEC 407
Application manual
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