Restricted Earth Fault Protection
Setting Ranges
Differential current
Ι
REF
>/Ι
NObj
0.05 to 2.00 Increments 0.01
Limit angle φ
REF
110° (fest)
Trip characteristic see Figure 4-6
Pickup tolerance
(with preset characteristic parameters and one
3-phase measuring location)
5 % at Ι < 5 · Ι
N
Time delay T
REF
0.00 s to 60.00 s
or ∞ (no trip)
Increments 0.01 s
Time tolerance 1 % of set value or 10 ms
The set times are pure delay times
Operating Time
7UT612
Pickup time at frequency 50 Hz 60 Hz
at 1.5 · setting Ι
REF
>, approx.
at 2.5 · setting Ι
REF
>, approx.
40 ms
37 ms
38 ms
32 ms
Rückfallzeit approx. 40 ms 40 ms
Dropout ratio approx. 0.7
7UT613/63x
Pickup time at frequency 50 Hz 60 Hz 16.7 Hz
at 1.5 · settting Ι
EDS
> approx.
fast relays 35 ms 30 ms 110 ms
high-speed relays 30 ms 25 ms 105 ms
at 2.5 · settting Ι
EDS
> approx.
fast relays 33 ms 29 ms 87 ms
high-speed relays 28 ms 24 ms 82 ms
Dropout time, approx. 26 ms 23 ms 51 ms
Dropout ratio approx. 0.7
Frequency Influence
Frequency Influence
within the frequency tagging range
4.3
Technical Data
4.3 Restricted Earth Fault Protection
414 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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