delay characteristic which matches the heating characteristic of the generator
2
2
I t
K
=
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*
BLOCK
BLKST1
BLKST2
BLKTR
TRIP
TR1
TR2
START
ST1
ST2
ALARM
NSCURR
ANSI08000359.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
Summary of Contents for Relion 670 series
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