7.5.2 Functionality
SEMOD153825-5 v7
The ability to accurately and reliably classify different types of fault so that single phase tripping
and autoreclosing can be used plays an important roll in today's power systems.
The phase selection function is design to accurately select the proper fault loop(s) in the distance
function dependent on the fault type.
The heavy load transfer that is common in many transmission networks may in some cases
interfere with the distance protection zone reach and cause unwanted operation. Therefore the
function has a built in algorithm for load encroachment, which gives the possibility to enlarge the
resistive setting of the measuring zones without interfering with the load.
The output signals from the phase selection function produce important information about faulty
phase(s), which can be used for fault analysis as well.
7.5.3 Function block
SEMOD155615-4 v4
ANSI06000429-2-en.vsd
FMPSPDIS
I3P*
V3P*
BLOCK
ZSTART
TR3PH
1POLEAR
PU_A
PU_B
PU_C
PHG_FLT
PHSCND
PLECND
DLECND
PICKUP
ANSI06000429 V2 EN-US
Figure 113: FMPSPDIS (21) function block
7.5.4 Signals
PID-3541-INPUTSIGNALS v7
Table 115: FMPSPDIS (21) Input signals
Name Type Default Description
I3P GROUP
SIGNAL
- Group signal for current
V3P GROUP
SIGNAL
- Group signal for voltage
BLOCK BOOLEAN 0 Block of function
Z_PICKUP BOOLEAN 0 Start from underimpdeance function
TR3PH BOOLEAN 0 Three phase tripping initiated
1POLEAR BOOLEAN 0 Single pole autoreclosing in progress
1MRK 502 066-UUS B Section 7
Impedance protection
241
Technical manual
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