Functions
6-145
7SJ63 Manual
C53000-G1140-C120-1
Result
As results of the fault location, the following results are displayed or obtained using
DIGSI
®
4:
−
One or more short circuit paths from which the fault reactance was derived.
−
One or more reactance’s per phase in
Ω
secondary.
−
The fault distances, proportional to the reactance’s, in km or miles of line, converted
on the basis of the line’s predetermined reactance (entered at address
or
, see Subsection 6.1.3).
Note:
The distance result, in miles or kilometers, can only be accurate for homogenous
line sections. If the line is made up of several sections with different reactance’s, then
the reactance derived by the fault location can be evaluated for a separate calculation
of the fault distance. For transformers and motors, only the reactance result, not the
distance result, is significant.
6.15.2 Setting The Functional Parameters
General
The calculation of fault distance will only take place if address
is set to
(QDEOHG
.
If the fault locating function is not needed, then address
should be set to
'LV
DEOHG
.
Initiation
Normally the fault location calculation is started when a protective element initiates a
trip signal. However, address
67$57
is set to
3LFNXS
, fault location can be ini-
tiated just by the pickup of a protective element. If address 8001 is set to
7ULS
, then
via a binary input, fault location can still be initiated just by the pickup of a protective
element.
Table 6-4
Selection of Paths to be Reported for Open-Delta Connected Voltage Transform-
ers
Pickup
Possible Paths
Evaluated Paths
Notes
A
A–B, C–A
Least
φ − φ
The least
φ
-
φ
path is dis-
played.
B
A–B, B–C
Least
φ − φ
C
C–A, B–C
Least
φ − φ
A, B
A–B
A–B
The appropriate
φ
-
φ
path is
displayed.
B, C
B–C
B–C
A, C
C–A
C–A
A, B, C
A–B, B–C, C–A
Least
φ
-
φ
path
The least
φ
-
φ
path is dis-
played.
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