ABB Relion 650 Series Technical Manual page 134

Section 5
Impedance protection
Zn = Vph / Iph
and three phase-to-phase loops according to
Zph-ph = Vph-ph / Iph-ph
The start operations from respective loop are binary coded into one word and provides an output
signal PLECND.
LdAngle
LdAngle
ANSI06000414 V1 EN-US
Figure 72: Influence on the characteristic by load encroachment logic
Outputs
The output of the sequence components based phase selector and the delta logic phase selector
activates the output signals PICKUP, PU_A, PU_B and PU_C. If a ground fault is detected the signal
PHG_FLT gets activated.
The phase selector also gives binary coded signals that are connected to the zone measuring
element in ZMOPDIS for releasing the correct measuring loop(s).
The output PHSCND provides release information from the phase selection part only. DLECND
provides release information from the load encroachment part only. In these signals, each fault
type has an associated value, which represents the corresponding zone measuring loop to be
released. The values are presented in table 35.
0= no faulted phases
1= AG
2= BG
4= CG
8= -ABG
16= -BCG
32= -CAG
56= -ABCG
8= -AB
Table continues on next page
128
X
RLd
LdAngle
R
LdAngle
RLd
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Line distance protection REL650
1MRK 506 326-UUS B
R
SEMOD153832-327 v5
Technical manual