13.8.7.2
Principle of operation
Zero sequence over voltage protection (LCZSPTOV, 59N) is a definite time stage
comparator function. The zero 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 zero sequence voltage is greater than the preset value
3V0PU
. Trip signal will be
set high after a time delay setting of
t3V0
. BLOCK input will block the complete
function. BLKTR will block the trip output. The zero sequence voltage will be
available as service value output as 3V0.
13.8.7.3
Function block
ANSI09000768-1-en.vsd
LCZSPTOV (59N)
V3P*
BLOCK
BLKTR
TRIP
RI
ANSI09000768 V1 EN
Figure 422:
LCZSPTOV (59N) function block
13.8.7.4
Input and output signals
Table 471:
LCZSPTOV (59N) 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 472:
LCZSPTOV (59N) Output signals
Name
Type
Description
TRIP
BOOLEAN
TRIP signal for zero sequence over voltage
RI
BOOLEAN
Start signal for zero sequence over voltage
1MRK505222-UUS C
Section 13
Scheme communication
847
Technical reference manual
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