Siemens SIPROTEC 7UT63 series - 4.8 Unbalanced Load Protection

4.8 Unbalanced Load Protection
457
7UT613/63x Manual
C53000-G1176-C160-2
4.8 Unbalanced Load Protection
Characteristics
Current Stages
Definite-time stages DT I
2
>>, I
2
>
Inverse time stages
(acc. to IEC or ANSI)
IT I
2P
One of the characteristics shown in figures 4-
14 to 4-17 can be selected
Reset characteristics
with disk emulation
IT For illustrations of possible reset time charac-
teristics see figures 4-14 to 4-17 on the left-
hand side.
Operating Range 0.1 to 4 I/InS
High current stage I
2
>> 0.10 A to 3.00 A
1)
Steps 0.01 A
T
I2
>> 0.00 s to 60.00 s
or ∞ (no trip)
Steps 0.01 s
Definite time current element
(50Ns-2, 50Ns-1)
I
2
> 0.10 A to 3.00 A
1)
Steps 0.01 A
T
I2
> 0.00 s to 60.00 s
or ∞ (no trip)
Steps 0.01 s
Inverse current element (51Ns-
IEC)
I
2P
0.10 A to 2.00 A
1)
Steps 0.01 A
T
I2P
0.05 s to 3.20 s
or ∞ (no trip)
Steps 0.01 s
Inverse current element (51Ns-
ANSI)
I
2P
0.10 A to 2.00 A
1)
Steps 0.01 A
D
I2P
0.50 s to 15.00 s
or ∞ (no trip)
Steps 0.01 s
Tolerances with inverse time
2)
currents 3 % of setting value or 1 % nominal current
times 1 % of setting value or 10 ms
Tolerances with definite time (IEC)
2)
currents Pickup with
1.05 ≤ I
2
/I
2P
≤ 1.15
times
5% ± 15 ms
5% ± 45 ms
at f
N
= 50/60 Hz
for f
N
= 16.7 Hz
for 2 ≤ I
2
/I
2P
≤ 20
and T
I2P
/s ≥ 1
Tolerances with definite time (ANSI)
2)
times
5% ± 15 ms
5% ± 45 ms
at f
N
= 50/60 Hz
for f
N
= 16.7 Hz
for 2 ≤ I
2
/I
2P
≤ 20
and D
I2P
/s ≥ 1
The set times are pure delay times.
1)
Secondary values for I
N
= 1 A; for I
N
= 5 A the currents must be multiplied by 5.
2)
For one 3-phase measuring location