Overvoltage Protection with Negative-Sequence Voltage
Setting Values for the Function
Measuring window 1 cycle to 10 cycles Increments of 1 cycle
Setting Values
Pickup value of V2 0.300 V to 200.000 V Increments of 0.001 V
Operate delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout ratio 0.90 to 0.99 Increments of 0.01
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 the overvoltage and of 105 % for the
undervoltage functionality.
Minimum absolute dropout differential 150 mV sec.
Times
Pickup times
55 ms to 210 ms + OOT
30
(depends on the measuring-window length) at 50 Hz
48 ms to 185 ms + OOT
(depends on the measuring-window length) at 60 Hz
Dropout time 20 ms to 70 ms + OOT
(depends on the measuring-window length)
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
Voltages
0.50 % of the setting value or 0.050 V
Time delays 1.00 % of the setting value or 10 ms
11.21
30
OOT (Output Operating Time) additional delay of the output medium used, for example 5 ms with fast relays
Technical Data
11.21 Overvoltage Protection with Negative-Sequence Voltage
SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual 601
C53000-G5040-C019-6, Edition 06.2016
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