Siemens SIPROTEC Manual page 589

Delay times
Delay of I-DIFF stage
Delay of I-DIFF stage
for 1-phase pickup in isolated / compensated net-
works
Expiry tolerances
The set times are pure delay times.
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 restraint
Restraint ratio
2nd harmonics to the fundamental I
Max. current for restraint
Crossblock Function
Max. action time for crossblock CROSSB 2HM
Conditioning for transformers (optional)
Vector group matching
Star-point conditioning
Emergency operation
If the communication fails and the distance protection is disabled
Frequency operating range
Frequency
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, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
(class)
/I
2fN fN
T-DELAY I-DIFF> 0.00 s to 60.00 s
or ∞ (no trip)
T3I0 1PHAS 0.00 s to 0.50 s
or ∞ (stage disabled for
1-phase pickup)
1 % of set value or 10 ms
1.00 to 10.00
0.5 % to 50.0 %
0.5 % to 50.0 %
Frequency deviations, delay time differences,
harmonics, synchronous quality, jitter
0 % to 45 %
I = 1 A 1.1 A to 25.0 A
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 stable when starting machine
N
Technical Data
4.3 Differential Protection
Increments 0.01 s
Increments 0.01 s
Increments 0.01
Increments 0.1 %
Increments 0.1 %
Increments 1 %
Increments 0.1 A
Increments 0.01 s
Increments 1
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