General Device Data
309
7SS52 V4 Manual
C53000-G1176-C182-1
9.2.11 Overcurrent Protection in the Bay Unit
Characteristic Definite or inverse time overcurrent
protection
Setting ranges High-set stage I>> (phase) I / I
N
0.05 to 25.00 (in steps of 0.01)
High-set stage IE>> (earth) I / I
N
0.05 to 25.00 (in steps of 0.01)
Trip time delays TI>>, TIE>> 0.00 to 60.00 s or
∞
Definite time
overcurrent
protection
Overcurrent stage I> (phase) I / I
N
0.05 to 25.00 (in steps of 0.01)
Overcurrent stage I
E
> (earth) I / I
N
0.05 to 25.00 (in steps of 0.01)
Trip time delays TI>, TIE> 0.00 to 60.00 s or
∞
Inverse-time
overcurrent
protection
Inverse time O/C stage I
P
(phase) I / I
N
0.10 to 4.00 (in steps of 0.01)
Inverse time O/C stage I
E
(earth) I / I
N
0.10 to 4.00 (in steps of 0.01)
Trip time delays TI
P
, TI
E
0.00 to 10.00 or ∞
Characteristics inverse (IEC 255-3 type A)
very inverse (IEC 255-3 type B)
extremely inverse (IEC 255-3 type C)
tripping times I>-, I>> stage Approx.25 ms
Drop-off times definite time Approx.25 ms
Tolerances Current 5 % of setting value or 50 mA
Time 5 % of setting value or 50 ms
+ 2% current tolerance or 50 ms
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