8.11.8
Technical data
Table 228:
GOPPDOP technical data
Function
Range or value
Accuracy
Power level
for Step 1 and Step 2
(0.0–500.0)% of SBase
When measuring transformer
inputs are used, the following
accuracy can be obtained for
low pickup settings which are
typical for reverse power
protection application:
±1.0% of S
r
at S ≤ S
r
±1.0% of S at S > S
r
Start value P=0.5% of S
r
Pickup accuracy of ±0.20% of
S
r
*)
Start value P=0.2% of S
r
Pickup accuracy of ±0.15% of
S
r
*)
where
1.732
r
r
r
S
U I
=
×
×
Characteristic angle
for Step 1 and Step 2
(-180.0–180.0) degrees
±2.0 degrees
Operate time, start at 0.5 to 2 x
S
r
and
k=0.000
Min. =10 ms
Max. = 25 ms
Reset time, start at 2 to 0.5 x S
r
and
k=0.000
Min. = 35 ms
Max. = 55 ms
Independent time delay to
operate for Step 1 and Step 2 at
0.5 to 2 x S
r
and
k=0.000
(0.01-6000.00) s
±0.2% or ±40 ms whichever is
greater
*) To achieve this accuracy for reverse power protection it is also recommended to apply settings
k=0.990 and Mode=PosSeq. These settings will help to minimize the overall measurement error
ensuring the best accuracy for this application.
8.12
Negativ sequence time overcurrent protection for
machines NS2PTOC
8.12.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative sequence time overcurrent
protection for machines
NS2PTOC
2I2>
46I2
8.12.2
Functionality
Negative-sequence time overcurrent protection for machines NS2PTOC is intended
primarily for the protection of generators against possible overheating of the rotor
caused by negative sequence current in the stator current.
The negative sequence currents in a generator may, among others, be caused by:
1MRK502052-UEN B
Section 8
Current protection
435
Technical manual
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