Unbalanced Load Protection - Siemens SIPROTEC 7UT613 series Manual

4.8

Unbalanced Load Protection

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