Directional Negative-Sequence Protection with Definite-Time
Delay
Setting Values
Directional mode Forward, backward, non-directional
Stabilization with phase currents 0 % to 30 % Increments of 1 %
Threshold value (pickup value) at I
N-rated
= 1 A 0.030 A to 35.000 A Increments of 0.001 A
Threshold value (pickup value) at I
N-rated
= 5 A 0.15 A to 175.00 A Increments of 0.01 A
Extension time of the blocking after a 1-pole pause 0.00 s to 60.00 s Increments of 0.01 s
Setting Values for Direction Determination
Minimum negative-sequence system voltage V2 0.150 V to 20.000 V Increments of 0.001 V
Minimum negative-sequence system
current I2
For I
rated
= 1 A 0.030 A to 10.000 A Increments of 0.001 A
For I
rated
= 5 A 0.15 A to 50.00 A Increments of 0.01 A
Upper limit angle forward, β
0
o
to 360
o
Increments of 1
o
Lower limit angle forward, α
0
o
to 360
o
Increments of 1
o
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
Operate time with time delay = 0 ms
Approx. 40 ms + OOT
109
at 50 Hz
Approx. 40 ms + OOT at 60 Hz
Dropout time Approx. 39 ms + OOT
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
Tolerances
Threshold values:
Negative-sequence voltage V2 1 % of the setting value or 0.5 V
Negative-sequence current I2 2 % of the setting value or 10 mA at I
rated
= 1 A
1 % of the setting value or 5 mA at I
rated
= 5 A
Times:
Independent time delays 1 % of the setting value or 10 ms
12.21
109
OOT (Output Operating Time) additional delay of the output medium used, see chapter 12.1.4 Relay Outputs
Technical Data
12.21 Directional Negative-Sequence Protection with Definite-Time Delay
1492 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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