VA
VB
VC
PU27PN
IN
VN
VAVB
VBVC
VCVA
OperMode
RELAG
RELBG
RELCG
Phase Preference
Evaluation
BFI_3P
Pickup_N
3VOPU
PU27PP
Voltage and
Current
Discrimination
Detect Cross-
Country fault
PHSEL
ANSI09000220-1-en.vsd
BLOCK
ZREL
AND
AND
ANSI09000220 V1 EN
Figure 198:
Simplified block diagram for Phase preference logic
6.15.3
Function block
ANSI07000029-2-en.vsd
PPLPHIZ
I3P*
V3P*
BLOCK
RELAG
RELBG
RELCG
PHSEL
BFI_3P
ZREL
ANSI07000029 V2 EN
Figure 199:
PPLPHIZ function block
1MRK505222-UUS C
Section 6
Impedance protection
375
Technical reference manual
Summary of Contents for Relion 670 series
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