Non-Directional 3I0 Stage
Setting Values
Method of Measurement Fundamental component
RMS value
Threshold
value 3I0>
Protection-class
current transformers
For I
ph-rated
=
1 A
0.030 A to 35.000 A Increments of 0.001 A
For I
ph-rated
=
5 A
0.15 A to 175.00 A Increments of 0.01 A
For transformer type
I-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 transformer type
I-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
Pickup delay 0.00 s to 60.00 s Increments of 0.01 s
Tripping delay 0.00 s to 60.00 s Increments of 0.01 s
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
Operate time with time delay = 0 ms
Approx. 25 ms + OOT
102
at 50 Hz
Approx. 23 ms + OOT at 60 Hz
Extension of the operate time during operation with
transformer inrush-current detection
Approx. 10 ms
Dropout time Approx. 25 ms + OOT at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Non-Directional Y0 Stage
Setting Values
V0> threshold value
0.300 V to 200.000 V Increments of 0.001 V
Threshold Y0> 0.10 mS to 100.00 mS Increments of 0.01 mS
12.18.8
12.18.9
102
OOT (Output Operating Time): additional delay of the output medium used, see chapter 12.1.4 Relay Outputs
Technical Data
12.18 Sensitive Ground-Fault Detection
SIPROTEC 5, Overcurrent Protection, Manual 1483
C53000-G5040-C017-8, Edition 07.2017
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