en05000668_ansi.vsd
R
X
R
X
R
X
Non-directional (ND) Forward (FWD) Reverse (REV)
60°
60°
60°
60°
ANSI05000668 V1 EN
Figure 169: Characteristics for non-directional, forward and reverse operation of
Phase selection, quadrilateral characteristic with settable angle
(FRPSPDIS, 21)
The setting of the load encroachment function may influence the total operating
characteristic, for more information, refer to section "Load encroachment".
The input DIRCND contains binary coded information about the directional coming
from the directional function ZDRDIR (21D). It shall be connected to the STDIR
output on ZDRDIR (21D). This information is also transferred to the input DIRCND
on the distance measuring zones, that is, the ZMRPDIS (21) block.
The code built up for the directionality is as follows:
STDIR=
FWD_A*1+FWD_B*4+FWD_C*16+FWD_AB*64+
+FWD_BC*256+FWD_CA*1024+REV_A*2+REV_B*8+REV_C*32+
+REV_AB*128+REV_BC*512+REV_CA*2048
If the binary information is 1 then it will be considered that we have pickup in forward
direction in phase A. If the binary code is 3 then we have pickup in forward direction
in phase A and B etc.
The or PHSEL output contains, in a similar way as DIRCND, binary coded
information, in this case information about the condition for opening correct fault loop
in the distance measuring element. It shall be connected to the PHSEL input on the
ZMRPDIS distance measuring zones (21) block.
The code built up for release of the measuring fault loops is as follows:
Section 6 1MRK505222-UUS C
Impedance protection
328
Technical reference manual
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