delay characteristic which matches the heating characteristic of the generator
as
defined in standard IEEE C50.13.
where:
I
2
is negative sequence current expressed in per unit of the rated generator
current
t is operating time in seconds
K is a constant which depends of the generators size and design
NS2PTOC (46I2) 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.
8.14.3 Function block
GUID-7071A62D-AB87-43C4-922A-1DD2E6DD5623 v2
NS2PTOC (46I2)
I3P*
BL OCK
BL KST1
BL KST2
BL KTR
TRIP
TR1
TR2
S TAR T
ST1
ST2
ALARM
NSCURR
A NSI08000359.vsdx
ANSI08000359 V3 EN-US
Figure 298: NS2PTOC (46I2) function block
8.14.4 Signals
PID-3854-INPUTSIGNALS v5
Table 299: NS2PTOC (46I2) Input signals
Name Type Default Description
I3P GROUP
SIGNAL
- Group connection for neg seq.
BLOCK BOOLEAN 0 Block of function
BLK1 BOOLEAN 0 Block of step 1
BLK2 BOOLEAN 0 Block of step 2
BLKTR BOOLEAN 0 Block of trip signals
Section 8 1MRK 502 066-UUS B
Current protection
562
Technical manual
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