ABB Relion 670 Series Technical Reference Manual page 853

1MRK505222-UUS C
13.8.7.2
13.8.7.3
13.8.7.4
Technical reference manual
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.
Function block
LCZSPTOV (59N)
V3P* TRIP
BLOCK RI
BLKTR
ANSI09000768-1-en.vsd
ANSI09000768 V1 EN
Figure 422: LCZSPTOV (59N) function block
Input and output signals
Table 471: LCZSPTOV (59N) Input signals
Name Type
V3P GROUP
SIGNAL
BLOCK BOOLEAN
BLKTR BOOLEAN
Table 472: LCZSPTOV (59N) Output signals
Name Type
TRIP BOOLEAN
RI BOOLEAN
Scheme communication
Default Description
- Three phase group signal for voltage inputs
0 Block overall function
0 Block TRIP output
Description
TRIP signal for zero sequence over voltage
Start signal for zero sequence over voltage
Section 13
847