ABB Relion 670 Series Technical Reference Manual page 553

1MRK505222-UUS C
TEST
TEST-ACTIVE
Blocked = Yes
BLOCK
PU_V_A
PU_V_B
PU_V_C
CBOPEN
VTSU
ANSI07000089 V2 EN
Figure 279: Simplified diagram of Loss of voltage check LOVPTUV (27)
8.6.3
Technical reference manual
AND
OR
AND
Latched
Enable
OR
0-tBlock
0
OR
Function block
LOVPTUV (27)
V3P* TRIP
BLOCK PICKUP
CBOPEN
VTSU
ANSI07000039-2-en.vsd
ANSI07000039 V2 EN
Figure 280: LOVPTUV (27) function block
Function Enable
AND
only 1 or 2 phases are low for
at least 10 s (not three)
AND
OR
Set Enable
0-tRestore
0
Line restored for
at least 3 s
Section 8
Voltage protection
PICKUP
tPulse
0-tTrip
0
Reset Enable
AND
OR
ANSI07000089_2_en.vsd
TRIP
547