Unbalanced Load Protection - Siemens SIPROTEC 4 7UT6 Series Manual

Technical Data

4.8 Unbalanced Load Protection

4.8 Unbalanced Load Protection
Characteristics
Definite-time stages
Inverse time stages
(acc. to IEC or ANSI)
Reset characteristics
with disk emulation
Operating Range
Current Stages
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 Ι
2) For one 3-phase measuring location
432
DT >>, Ι
Ι
2
IT
Ι
2P
One of the characteristics shown in
Figure 4-14
IT For illustrations of possible reset time charac-
teristics see
the left-hand side.
0.1 to 4 Ι/ΙnS
>> 0.10 A to 3.00 A
Ι
2
T >> 0.00 s to 60.00 s
Ι2
or ∞ (no trip)
>
Ι 0.10 A to 3.00 A
2
T > 0.00 s to 60.00 s
Ι2
or ∞ (no trip)
Ι 0.10 A to 2.00 A
2P
T 0.05 s to 3.20 s
Ι2P
or ∞ (no trip)
0.10 A to 2.00 A
Ι
2P
D 0.50 s to 15.00 s
Ι2P
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 ≤ Ι
and T
2)
5 % ± 15 ms
5 % ± 45 ms
for 2 ≤ Ι
and D
= 1 A; bei Ι = 5 A the currents must be multiplied by 5.
N N
>
2
to Figure 4-17 can be selected
Figure 4-14 to Figure 4-17
Increments 0.01 A
1)
Increments 0.01 s
Increments 0.01 A
1)
Increments 0.01 s
Increments 0.01 A
1)
Increments 0.01 s
Increments 0.01 A
1)
Increments 0.01 s
at
1.05 ≤ Ι
at f = 50/60 Hz
N
at f = 16.7 Hz
N
(only 7UT613/63x)
/Ι ≤ 20
2 2P
/s ≥ 1
Ι2P
bei f
N
bei f
N
(only 7UT613/63x)
/Ι ≤ 20
2 2P
/s ≥ 1
Ι2P
C53000-G1176-C230-5, Edition 09.2016
on
/Ι ≤ 1.15
2 2P
= 50/60 Hz
= 16.7 Hz
SIPROTEC 4, 7UT6x, Manual