Underfrequency Load Shedding - Siemens SIPROTEC 5 Technical Data Manual

11.24

Underfrequency Load Shedding

Setting Values for the Function
Minimum voltage
Minimum current
Power angle
Positive power direction
Threshold value for the df/dt-rising
rate or df/dt-falling rate
df/dt measuring window
df/dt dropout differential
f < stabilization counter
Setting Values for the Stage
Pickup threshold
Dropout differential
Time delay
Times
Pickup times with stabilization counter = 6
Dropout time
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout
Frequency
df/dt-rising rate and df/dt-falling rate
Voltage V1
Current I1
Power angle
Minimum absolute dropout differential
Protection-class current transformer
Instrument current transformer
Voltage transformer
Tolerances
Frequency f<
f - 0.20 Hz < f < f
rated
82 OOT (Output Operating Time): additional time delay of the output medium used, for example, 5 ms with fast relay
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-A, Edition 05.2018
0.300 p.u. to 0.900 p.u.
0.020 p.u. to 0.200 p.u.
-30° to 30°
inv. to CT neu.pnt sett.
acc. to CT neu.pnt sett.
0.1 Hz/s to 20.0 Hz/s
2 periods to 5 periods
0.02 Hz/s to 0.99 Hz/s
1 to 20
40.00 Hz to 70.00 Hz
20 mHz to 2000 mHz
0.00 s to 60.00 s
+ 0.20 Hz
rated
11.24 Underfrequency Load Shedding
Increments of 0.001 p.u.
Increments of 0.001 p.u.
Increments of 1°
Increments of 0.1 Hz/s
Increments of 1 period
Increments of 0.10 Hz/s
Increments of 1
Increments of 0.01 Hz
Increments of 10 mHz
Increments of 0.01 s
Approx. 85 ms + OOT 82 at 50 Hz
Approx. 80 ms + OOT at 60 Hz
Approx. 80 ms + OOT at 50 Hz
Approx. 75 ms + OOT at 60 Hz
0.01 Hz
0.1 Hz/s
105 % of the threshold value
105 % of the threshold value at φ ≤ 0
95.23 % of the threshold value at φ > 0
1°
15 mA sec. (I = 1 A) or
rated
75 mA sec. (I = 5 A)
rated
0.5 mA sec. (I = 1 A) or
rated
2.5 mA sec. (I = 5 A)
rated
150 mV sec.
± 5 mHz at V = V
rated
Technical Data
1179