7.11
Phase selection, quadrilateral characteristic with fixed
angle FDPSPDIS
IP12400-1 v3
7.11.1
Identification
7.11.1.1
Identification
M14850-1 v5
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase selection with load
encroachment, quadrilateral
characteristic
FDPSPDIS
Z<phs
SYMBOL-DD V1 EN-US
21
7.11.2
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.
7.11.3
Setting guidelines
IP14959-1 v2
The following setting guideline consider normal overhead lines applications where φloop and
φline is greater than 60°.
7.11.3.1
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 entire line. It is not
necessary to cover all distance protection zones. A safety margin of at least 10% is
recommended. In order to get operation from distance zones , the phase selection outputs
STCNDZ or STCNDLE must be connected to input on ZMQPDIS, distance measuring block.
For normal overhead lines, the angle for the loop impedance φ for phase-to-earth fault is
defined according to equation
.
L
L
X1
arctan
R1
+
j =
+
XN
RN
EQUATION2115 V1 EN-US
(Equation 301)
1MRK 505 343-UEN B
Section 7
Impedance protection
295
Application manual
Summary of Contents for Relion 670 series
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