M13279-1 v10
Table 61. Pole discordance protection CCPDSC
Function Range or value Accuracy
Operate current (0–100)% of
IBase
±1.0% of I
r
Independent time delay between trip
condition and trip signal
(0.000-60.000) s ±0.2% or ± 30 ms whichever is greater
SEMOD175152-2 v11
Table 62. Directional underpower protection GUPPDUP
Function Range or value Accuracy
Power level
for Step 1 and Step 2
(0.0–500.0)% of
SBase
±1.0% of S
r
at S ≤ S
r
±1.0% of S at S > S
r
where
Characteristic angle
for Step 1 and Step 2
(-180.0–180.0) degrees ±2.0 degrees
Independent time delay to operate for
Step 1 and Step 2 at 2 x S
r
to 0.5 x S
r
and
k
=
0.000
(0.01-6000.00) s ±0.2% or ±40 ms whichever is greater
SEMOD175159-2 v9
Table 63. Directional overpower protection GOPPDOP
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
Characteristic angle
for Step 1 and Step 2
(-180.0–180.0) degrees ±2.0 degrees
Operate time, start at 0.5 x S
r
to 2 x S
r
and
k
=
0.000
Min. =10 ms
Max. = 25 ms
Reset time, start at 2 x S
r
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 x S
r
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.
Generator protection REG670
1MRK 502 074-BEN M
Hitachi Power Grids 85
© Copyright 2017 Hitachi Power Grids. All rights reserved
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