One undervoltage step with definite time characteristic is also available within the
function in order to provide functionality for overcurrent protection with undervoltage
seal-in.
8.10.3
Function block
VRPVOC
I3P*
U3P*
BLOCK
BLKOC
BLKUV
TRIP
TROC
TRUV
START
STOC
STUV
IMAX
UUMIN
IEC10000118-2-en.vsd
IEC10000118 V2 EN
Figure 125:
VRPVOC function block
8.10.4
Signals
Table 147:
VRPVOC Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three phase group signal for current inputs
U3P
GROUP
SIGNAL
-
Three phase group signal for voltage inputs
BLOCK
BOOLEAN
0
Block of function both stages
BLKOC
BOOLEAN
0
Block of voltage restraint overcurrent stage (ANSI
51V)
BLKUV
BOOLEAN
0
Block of under voltage function
Table 148:
VRPVOC Output signals
Name
Type
Description
TRIP
BOOLEAN
General trip signal
TROC
BOOLEAN
Trip signal from voltage restraint overcurrent stage
TRUV
BOOLEAN
Trip signal from undervoltage function
START
BOOLEAN
General start signal
STOC
BOOLEAN
Start signal from voltage restraint overcurrent
stage
STUV
BOOLEAN
Start signal from undervoltage function
IMAX
REAL
Maximum phase current magnitude
UUMIN
REAL
Minimum ph-to-ph voltage magnitude
Section 8
1MRK 502 048-UEN A
Current protection
250
Technical manual
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