ANSI00000545-5-en.vsd
AND
AND
AND
IRELPG
AND
AND
AND
IRELPP
INDIR_A
INDIR_B
INDIR_C
OR
OR
OR
OR
INDIR_CA
INDIR_BC
INDIR_AB
PHSEL_G
PHSEL_A
PHSEL_B
PHSEL_C
OR
PHSEL_PP
15 ms
0
15 ms
0
15 ms
0
15 ms
0
15 ms
0
LDEblockA
LDEblockB
LDEblockC
LDEblockAB
LDEblockBC
LDEblockCA
I_A
ZMA
OR
I_A & I_B
ZMAB
OR
I_B
ZMB
OR
I_C
ZMC
OR
I_B & I_C
ZMBC
OR
I_C & I_A
ZMCA
OR
ANSI00000545 V5 EN-US
Figure 143: Composition on non-directional phase selection signals
Composition of the directional (forward and reverse) phase selective signals is presented
schematically in figure
144 and figure 145. The directional criteria appears as a condition for the
correct phase selection in order to secure a high phase selectivity for simultaneous and evolving
faults on lines within the complex network configurations. Internal signals DFWLn and DFWLnLm
present the corresponding directional signals for measuring loops with phases Ln and Lm.
Designation FW (figure
145) represents the forward direction as well as the designation RV
(figure 144) represents the reverse direction. All directional signals are derived within the
corresponding digital signal processor.
Figure
144 presents additionally a composition of a PHSELZ output signal, which is created on the
basis of impedance measuring conditions. This signal can be configured to PHSEL functional input
signals of the distance protection zone and this way influence the operation of the phase-to-phase
and phase-to-ground zone measuring elements and their phase related pickup and tripping
signals.
1MRK 502 066-UUS B Section 7
Impedance protection
287
Technical manual
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