Functions
2.3 Differential Protection
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
107
2.3.3
Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Additional Settings.
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding second-
ary nominal current of the current transformer.
Addr.
Parameter
C
Setting Options
Default Setting
Comments
1201
STATE OF DIFF.
OFF
ON
ON
State of differential protec-
tion
1210
I-DIFF>
1A
0.10 .. 20.00 A
0.30 A
I-DIFF>: Pickup value
5A
0.50 .. 100.00 A
1.50 A
1213
I-DIF>SWITCH ON
1A
0.10 .. 20.00 A
0.30 A
I-DIFF>: Value under
switch on condition
5A
0.50 .. 100.00 A
1.50 A
1217A
T-DELAY I-DIFF>
0.00 .. 60.00 sec;
∞
0.00 sec
I-DIFF>: Trip time delay
1218
T3I0 1PHAS
0.00 .. 0.50 sec;
∞
0.04 sec
Delay 1ph-faults
(comp/isol. star-point)
1219A
I> RELEASE DIFF
1A
0.10 .. 20.00 A; 0
0.00 A
Min. local current to
release DIFF-Trip
5A
0.50 .. 100.00 A; 0
0.00 A
1221
Ic-comp.
OFF
ON
OFF
Charging current compen-
sation
1224
IcSTAB/IcN
2.0 .. 4.0
2.5
Ic Stabilising / Ic Nominal
1233
I-DIFF>>
1A
0.8 .. 100.0 A;
∞
1.2 A
I-DIFF>>: Pickup value
5A
4.0 .. 500.0 A;
∞
6.0 A
1235
I-DIF>>SWITCHON
1A
0.8 .. 100.0 A;
∞
1.2 A
I-DIFF>>: Value under
switch on cond.
5A
4.0 .. 500.0 A;
∞
6.0 A
2301
INRUSH REST.
OFF
ON
OFF
Inrush Restraint
2302
2nd HARMONIC
10 .. 45 %
15 %
2nd. harmonic in % of fun-
damental
2303
CROSS BLOCK
NO
YES
NO
Cross Block
2305
MAX INRUSH PEAK
1A
1.1 .. 25.0 A
15.0 A
Maximum inrush-peak
value
5A
5.5 .. 125.0 A
75.0 A
2310
CROSSB 2HM
0.00 .. 60.00 sec;
∞
0.00 sec
Time for Crossblock with
2nd harmonic