ABB Relion 670 series - Page 346

ANSI00000545-3-en.vsd
ZMA
ZMB
AND
AND
AND
ZMC
IRELPG
AND
AND
AND
ZMAB
ZMBC3
ZMCA
IRELPP
INDIR_A
INDIR_B
INDIR_3
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
ANSI00000545 V3 EN
Figure 179: Composition on non-directional phase selection signals
Composition of the directional (forward and reverse) phase selective signals is
presented schematically in figure 112 and figure 113. 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
113) represents the forward direction as well as the designation RV (figure 112)
represents the reverse direction. All directional signals are derived within the
corresponding digital signal processor.
Figure
112 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.
Section 6 1MRK505222-UUS C
Impedance protection
340
Technical reference manual