ABB Relion 670 series, Technical Reference Manual

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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