Siemens SIPROTEC 7UT63 series - 4.4 Time Overcurrent Protection for Phase and Residual Currents

4 Technical Data
442
7UT613/63x Manual
C53000-G1176-C160-2
4.4 Time Overcurrent Protection for Phase and Residual Currents
Characteristics
Current Stages
Definite-time stages DT I
Ph
>>, 3I
0
>>, I
Ph
>, 3I
0
>
Inverse time stages
(acc. to IEC or ANSI)
IT I
P
, 3I
0P
one of the tripping curves depicted in figures
to 4-12 on the right-hand side may be select-
ed;
alternatively user specified trip and reset char-
acteristic
Reset characteristics
(with disk emulation)
IT For illustrations of possible reset time charac-
teristics see figures to 4-12 on the left-hand
side.
High current stages I
Ph
>> 0.10 A to 35.00 A
1)
or ∞ (ineffective)
Steps 0.01 A
T
IPh>>
0.00 s to 60.00 s
or ∞ (no trip)
Steps 0.01 s
3I
0
>> 0.10 A to 35.00 A
1)
or ∞ (ineffective)
Steps 0.01 A
T
3I0>>
0.00 s to 60.00 s
or ∞ (no trip)
Steps 0.01 s
Definite time current elements
(50Ns-2, 50Ns-1)
I
Ph
> 0.10 A to 35.00 A
1)
or ∞ (ineffective)
Steps 0.01 A
T
IPh>
0.00 s to 60.00 s
or ∞ (no trip)
Steps 0.01 s
3I
0
> 0.10 A to 35.00 A
1)
or ∞ (ineffective)
Steps 0.01 A
T
3I0>
0.00 s to 60.00 s
or ∞ (no trip)
Steps 0.01 s
Inverse current elements (51Ns-
IEC)
I
P
0.10 A to 4.00 A
1)
Steps 0.01 A
T
IP
0.05 s to 3.20 s
or ∞ (no trip)
Steps 0.01 s
3I
0P
0.05 A to 4.00 A
1)
Steps 0.01 A
T
3I0P
0.05 s to 3.20 s
or ∞ (no trip)
Steps 0.01 s
Inverse current elements (51Ns-
ANSI)
I
P
0.10 A to 4.00 A
1)
Steps 0.01 A
D
IP
0.50 s to 15.00 s
or ∞ (no trip)
Steps 0.01 s
3I
0P
0.05 A to 4.00 A
1)
Steps 0.01 A
D
3I0P
0.50 s to 15.00 s
or ∞ (no trip)
Steps 0.01 s
Tolerances with inverse time
2)
currents 3 % of set value or 1 % rated current
times 1 % of set value or 10 ms
Tolerances with definite time (IEC)
2)
currents Pickup at 1.05 ≤ I/I
P
≤ 1.15;
or 1.05 ≤ I/3I0P ≤ 1.15