ABB Relion 670 series, Техническое руководство

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These directional indications are based on the sector boundaries of the directional function and
the impedance setting of FRPSPDIS (21) function. Their operating characteristics are illustrated in
figure 133 .
en05000668_ansi.vsd
R
X
R
X
R
X
Non-directional (ND) Forward (FWD) Reverse (REV)
60°
60°
60°
60°
ANSI05000668 V1 EN-US
Figure 133: 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:
PHSEL = AG*1+BG*2+CG*4+AB*8+BC*16+CA*32
Section 7 1MRK 502 066-UUS B
Impedance protection
276
Technical manual