Siemens SIPROTEC 4 7UT6 Series - Page 419

Trip Time Curves acc. to IEC
Acc. to IEC 60255-3 or BS 142, Section 3.5.2 (see also Figure 4-7 and Figure 4-8)
The tripping times for Ι/Ι
p
≥ 20 are identical to those for Ι/Ι
p
= 20
For residual current read 3Ι0p instead of Ι
p
and T
3Ι0p
instead of T
p
;
for earth faults readΙ
Ep
instead of Ι
p
and T
ΙEp
instead of T
p
Pickup Threshold
approx. 1.10 · Ι
p
Dropout Time Curves as per IEC
Acc. to IEC 60255-3 or BS 142, Section 3.5.2 (see also
Figure 4-7 and Figure 4-8)
The reset time characteristics apply to (Ι/Ιp) ≤ 0.90
For residual current read 3Ι0p instead of Ι
p
and T
3Ι0p
instead of T
p
for earth faults read Ι
Ep
instead of Ι
p
and T
ΙEp
instead of T
p
Technical Data
4.4 Time Overcurrent Protection for Residual Current
SIPROTEC 4, 7UT6x, Manual 419
C53000-G1176-C230-5, Edition 09.2016