8.2 Phase selection, quad, fixed angle, load
encroachment FDPSPDIS
IP12400-1 v4
8.2.1 Identification
8.2.1.1 Identification
M14850-1 v6
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase selection, quad, fixed angle,
load encroachment
FDPSPDIS
SYMBOL-DD V1 EN-US
21
8.2.2 Application
M13138-3 v3
The operation of transmission networks today is in many cases close to the stability
limit. The ability to accurately and reliably classify the different types of fault, so
that single pole tripping and autoreclosing can be used plays an important role in
this matter. Phase selection with load encroachment function FDPSPDIS is
designed to accurately select the proper fault loop in the distance measuring
function depending on the fault type.
The heavy load transfer that is common in many transmission networks may in
some cases be in opposite to the wanted fault resistance coverage. Therefore, the
function has a built in algorithm for load encroachment, which gives the possibility
to enlarge the resistive setting of both the Phase selection with load encroachment
and the measuring zones without interfering with the load.
A current-based phase selection is also included. The measuring elements
continuously measure three phase currents and the residual current and, compare
them with the set values.
The extensive output signals from FDPSPDIS give also important information
about faulty phase(s), which can be used for fault analysis.
8.2.3 Setting guidelines
IP14959-1 v2
The following setting guideline consider normal overhead lines applications where
φloop and φline is greater than 60°.
8.2.3.1 Load encroachment characteristics
M13142-3 v6
The phase selector must at least cover the overreaching zone 2 in order to achieve
correct phase selection for utilizing single-phase autoreclosing for faults on the
Section 8 1MRK 506 369-UEN B
Impedance protection
202 Line distance protection REL670 2.2 IEC
Application manual
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