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8.9.8
Technical data
Table 146:
NS2PTOC technical data
Function
Range or value
Accuracy
Operate value, step 1
and 2, negative
sequence
overcurrent
(3-500)% of
IBase
± 1.0% of I
r
at I < I
r
± 1.0% of I at I > I
r
Reset ratio, step 1
and 2
>95%
-
Operate time, start
30 ms typically at 0 to 2 x I
set
20 ms typically at 0 to 10 x I
set
-
Reset time, start
40 ms typically at 2 to 0 x I
set
-
Time characteristics
Definite or Inverse
-
Inverse time
characteristic step 1,
2
2
I t
K
=
K=1.0-99.0
± 3% or ± 40 ms
1 ≤ K ≤ 20
Reset time, inverse
characteristic step 1,
2
2
I t
K
=
K=0.01-20.00
± 10% or ± 50 ms
1 ≤ K ≤ 20
Maximum trip delay,
step 1 IDMT
(0.00-6000.00) s
± 0.5% ± 25 ms
Minimum trip delay,
step 1 IDMT
(0.000-60.000) s
± 0.5% ± 25 ms
Timers
(0.00-6000.00) s
± 0.5% ± 25 ms
8.10
Voltage-restrained time overcurrent protection
VRPVOC
8.10.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage-restrained time overcurrent
protection
VRPVOC
I>/U<
51V
8.10.2
Functionality
Voltage-restrained time overcurrent protection (VRPVOC) function is recommended
as a backup protection for generators.
The overcurrent protection feature has a settable current level that can be used either
with definite time or inverse time characteristic. Additionally, it can be voltage
controlled/restrained.
1MRK 502 048-UEN A
Section 8
Current protection
249
Technical manual
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