Siemens SIPROTEC 7SD610 Manual page 339

Self-Restraint
Current transformer error at each end of the protected object
Ratio between operating accuracy limit factor
and nominal accuracy limit factor n'/n
Transformer error at n'/n
.
Transformer error at n
I
N
Further restraint quantities
(adaptive self-restraint)
Inrush stabilization
Restraint ratio
2. Inrush stabilization I
2fN
Max. current for restraint
Crossblock Function
Max. action time for crossblock CROSSB 2HM
Conditioning for Transformers (optional)
Matching of Vector Group
Star-point conditioning
Emergency operation
Communication failure
Frequency
Operating range
Standard precision of operational measured values
The standard precision of the operational measured values of the differential protection from ± 0,5 % of the rated opera-
tional current is ensured up to a transformer error adjustment of 2:1.
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
(class)
/I
fN
1 to 10.00
0.5 % to 50.0 %
0.5 % to 50.0 %
Frequency deviations, delay time differences, har-
monics, synchronous quality, jitter
0 % to 45 %
= 1 A 1.1 A to 25.0 A
I
N
I = 5 A 5.5 A to 125.0 A
N
Can be switched on/off
0.00 s to 60.00 s
or 0 (crossblock disabled)
or ∞ (active until dropout)
0 to 11 (x 30°)
earthed or non-earthed
(for each winding)
see section „Time Overcurrent Protection"
0.8 ≤ f/f ≤ 1.2
N
stable when starting machine
Technical Data
4.3 Differential Protection
Increment 0.01
Steps 0.1 %
Steps 0.1 %
Steps 1 %
Increment 0.1 A
Increments 0.01 s
Increment 1
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