13.8.8.2
Principle of operation
Negative sequence overcurrent protection (LCNSPTOC, 46) is a definite time stage
comparator function. The negative sequence input current from the SMAI block is
connected as input to the function through a group connection I3P in PCM600. This
current is compared against the preset value and a pickup signal will be set high if the
input negative sequence current is greater than the preset value
Pickup2
. Trip signal
will be set high after a time delay setting of
tI2
. BLOCK input will block the complete
function. BLKTR will block the trip output. The negative sequence current is available
as service value output I2.
13.8.8.3
Function block
ANSI09000769-1-en.vsd
LCNSPTOC (46)
I3P*
BLOCK
BLKTR
TRIP
RI
ANSI09000769 V1 EN
Figure 423:
LCNSPTOC (46) Function block
13.8.8.4
Input and output signals
Table 475:
LCNSPTOC (46) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three phase group signal for current inputs
BLOCK
BOOLEAN
0
Block overall function
BLKTR
BOOLEAN
0
Block trip signal
Table 476:
LCNSPTOC (46) Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip signal negative sequence over current protection
RI
BOOLEAN
Start signal for negative sequence over current
protection
1MRK505222-UUS C
Section 13
Scheme communication
849
Technical reference manual
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