Function Block; Signals - ABB REG650 Technical Manual

Section 8
Current protection
8.9.3
8.9.4
244
K
NS2PTOC has a wide range of K settings and the sensitivity and capability of
detecting and tripping for negative sequence currents down to the continuous
capability of a generator.
In order to match the heating characteristics of the generator a reset time parameter can
be set.
A separate definite time delayed output is available as an alarm feature to warn the
operator of a potentially dangerous situation.

Function block

NS2PTOC
I3P* TRIP
BLOCK TR1
BLKST1 TR2
BLKST2 START
ST1
ST2
ALARM
NSCURR
IEC08000359-2-en.vsd
IEC08000359-1-EN V2 EN
Figure 121: NS2PTOC function block

Signals

Table 141: NS2PTOC Input signals
Name Type
I3P GROUP
SIGNAL
BLOCK BOOLEAN
BLKST1 BOOLEAN
BLKST2 BOOLEAN
Table 142: NS2PTOC Output signals
Name Type
TRIP BOOLEAN
TR1 BOOLEAN
TR2 BOOLEAN
START BOOLEAN
ST1 BOOLEAN
Table continues on next page
is a constant which depends of the generators size and design
Default Description
- Group connection for neg seq.
0 Block of function
0 Block of step 1
0 Block of step 2
Description
Common trip signal
Trip signal for step 1
Trip signal for step 2
Common start signal
Start signal for step 1
1MRK 502 048-UEN A
Technical manual