General Device Data
307
7SS52 V4 Manual
C53000-G1176-C182-1
9.2.9 Busbar Protection
Characteristic Stabilized differential current
measurement
Setting ranges Overcurrent I / I
no
1
0.20 to 4.00 (in steps of 0.01)
Stabilizing factor
for bus section-selective
protection k 0.10 to 0.80 (in steps of 0.01)
Stabilizing factor for
the check zone k 0.00 to 0.80 (in steps of 0.01)
Diff-current
supervision
Setting ranges
Current threshold I / I
no
1
0.05 to 0.80 (in steps of 0.01)
Time delay 1 to 10 s (in steps of 1)
2
Tripping time Typical tripping time 15 ms
Drop-off times TRIP Reset in Bay unit Approx. 45 ms
Tolerances Current 5 % of setting value or 50 mA
k factor 5 % of setting value
Time 5 % of setting value or 50 ms
1I
no
= normalized nominal current referred to the current transformer with the highest ratio
(base CT)
2 Identical setting ranges for the zone-selective protection and the check zone
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