2.3 Differential Protection
103
7SD5 Manual
C53000-G1176-C169-1
block is to be activated is set under address 2310 CROSSB 2HM. With the setting ∞
the crossblock function is always active until the second harmonic content in all
phases has dropped below the set value.
2.3.3 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Ad-
ditional Settings.
The table indicates region-specific presettings. Column C (configuration) indicates the
corresponding secondary 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)
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
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
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