Directional Intermittent Ground-Fault Protection
Setting Values
Threshold
value 3I0>
For current transformer type
protection and I
rated
= 1 A
0.030 A to 35.000 A Increments of 0.001 A
For current transformer type
protection and I
rated
= 5 A
0.15 A to 175.00 A Increments of 0.01 A
For I
N
transformer
type sensitive and
I
N-rated
= 1 A
For I
ph-rated
= 1 A 0.001 A to 35.000 A Increments of 0.001 A
For I
ph-rated
= 5 A 0.001 A to 175.000 A Increments of 0.001 A
For I
N
transformer
type sensitive and
I
N-rated
= 5 A
For I
ph-rated
= 1 A 0.005 A to 35.000 A Increments of 0.001 A
For I
ph-rated
= 5 A 0.005 A to 175.000 A Increments of 0.001 A
Number of pulses until intermit-
tent ground fault
2 to 10 Increments of 1
Pickup extension time 0.00 s to 10.00 s Increments of 0.01 s
Sum of extended pickup times 0.00 s to 100.00 s Increments of 0.01 s
Reset time 1.00 s to 600.00 s Increments of 0.01 s
Number of pulses for operate 2 to 100 Increments of 1
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout differential derived from the parameter
Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for overcurrent and of 105 % for undercur-
rent functionality.
Minimum absolute dropout differential
Protection-class current transformer 15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument current transformer 0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Times
Pickup time
Approx. 30 ms + OOT
90
at 50 Hz
Approx. 23 ms + OOT at 60 Hz
Dropout time Approx. 25 ms + OOT at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Frequency Operating Range
0.9 ≤ f/f
rated
≤ 1.1 According to specified tolerances
10 Hz ≤ f < 0.9 f
rated
1.1 f
rated
< f ≤ 80 Hz
Slightly expanded tolerances
f < 10 Hz
f > 80 Hz
Active with less sensitivity
12.17
90
OOT (Output Operating Time): additional delay of the output medium used, for example 5 ms with fast relays
Technical Data
12.17 Directional Intermittent Ground-Fault Protection
1474 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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