Negative-Sequence Protection
Stage with Definite-Time Characteristic Curve
Setting Values
Reference value for I
2
(I
ref
) Rated object current I
rated, obj.
Positive-sequence current I
1
Pickup value 5.0 % to 999.9 % l
2
/l
ref
Increments of 0.1
Dropout ratio 0.40 to 0.99 Increments of 0.01
Time delay 0.00 s to 60.00 s Increments of 0.01 s
Release current (minimum
current release)
1 A @ 50 and 100 Irated 0.030 A to 10.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.15 A to 50.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.001 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.005 A to 8.000 A Increments of 0.001 A
Maximum phase current
(maximum current
limiting)
1 A @ 50 and 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.001 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.005 A to 8.000 A Increments of 0.001 A
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
•
Dropout differential derived from the parameter Dropout ratio
•
Dropout differential of 3 % of the object rated current
Times
Pickup time
Approx. 40 ms + OOT
107
at 50 Hz
Approx. 35 ms + OOT at 60 Hz
Dropout time Approx. 35 ms + OOT
Current Operating Range
Current range
At least one phase current ≥ setting value I
release
All phase currents ≤ setting value I
ph, max
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
Inactive
12.20
12.20.1
107
OOT (Output Operating Time): additional delay of the output medium used, see chapter 12.1.4 Relay Outputs
Technical Data
12.20 Negative-Sequence Protection
1488 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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