13.8.6.2
Principle of operation
Negative sequence over voltage protection (LCNSPTOV, 47) is a definite time stage
comparator function. The negative sequence input voltage from the SMAI block is
connected as input to the function through a group connection V3P in PCM600. This
voltage is compared against the preset value and a pickup signal will be set high if the
input negative sequence voltage is greater than the preset value
Pickup2
. Trip signal
will be set high after a time delay setting of
tV2
. There is a BLOCK input which will
block the complete function. BLKTR will block the trip output. The negative sequence
voltage is also available as service value output U2.
13.8.6.3
Function block
ANSI09000767-1-en.vsd
LCNSPTOV (47)
V3P*
BLOCK
BLKTR
TRIP
RI
ANSI09000767 V1 EN
Figure 421:
LCNSPTOV (47) Function block
13.8.6.4
Input and output signals
Table 467:
LCNSPTOV (47) Input signals
Name
Type
Default
Description
V3P
GROUP
SIGNAL
-
Three phase group signal for voltage inputs
BLOCK
BOOLEAN
0
Block overall function
BLKTR
BOOLEAN
0
Block trip output
Table 468:
LCNSPTOV (47) Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip signal for negative sequence over voltage
RI
BOOLEAN
Start signal for negative sequence over voltage
1MRK505222-UUS C
Section 13
Scheme communication
845
Technical reference manual
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