Time Overcurrent Protection for Earth Current
Characteristics
Definite-time stages DT
Ι
E
>>, Ι
E
>
Inverse time stages
(acc. to IEC or ANSI)
IT
Ι
EP
The same characteristics apply as for time
overcurrent protection for phase and residual
currents in accordance with the preceding
section
Reset characteristics
with disk emulation
IT The same reset time characteristics apply as
for time overcurrent protection for phase and
residual currents in accordance with the
preceding section
Current Stages
High current stage
Ι
E
>>
0.05 A to 35.00 A
1)
or ∞ (ineffective)
Increments 0.01 A
T
ΙE>>
0.00 s to 60.00 s
or ∞ (no trip)
Increments 0.01 s
Definite time current element
(50Ns-2, 50Ns-1)
Ι
E
>
0.05 A to 35.00 A
1)
or ∞ (ineffective)
Increments 0.01 A
T
ΙE>
0.00 s to 60.00 s
or ∞ (no trip)
Increments 0.01 s
Inverse current element (51Ns-
IEC)
Ι
EP
0.05 A to 4.00 A
1)
Increments 0.01 A
T
ΙEP
0.05 s to 3.20 s
or ∞ (no trip)
Increments 0.01 s
Inverse current element (51Ns-
ANSI)
Ι
EP
0.05 A to 4.00 A
1)
Increments0.01 A
D
ΙEP
0.50 s to 15.0 s
or ∞ (no trip)
Increments 0.01 s
Tolerances with definite time
currents 3 % vom Einstellwert bzw. 1 % Nennstrom
times 1 % vom Einstellwert bzw. 10 ms
Tolerances with inverse time (IEC)
currents Ansprechen at
1.05 ≤ Ι/Ι
EP
≤ 1.15;
times 5 % ± 15 ms
5 % ± 45 ms
at f
N
= 50/60 Hz
at f
N
= 16.7 Hz
(only 7UT613/63x)
for 2 ≤ Ι/Ι
EP
≤ 20
and T
ΙEP
/s ≥ 1
Tolerances with inverse time (ANSI)
times 5 % ± 15 ms
5 % ± 45 ms
at f
N
= 50/60 Hz
at f
N
= 16.7 Hz
(only 7UT613/63x)
for 2 ≤ Ι/Ι
EP
≤ 20
and D
ΙEP
/s ≥ 1
4.5
Technical Data
4.5 Time Overcurrent Protection for Earth Current
428 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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