Overvoltage Protection With Negative-Sequence Voltage - Siemens Siprotec 5 7SS85 Techical Data

11.21

Overvoltage Protection with Negative-Sequence Voltage

Setting Values for the Function
Measuring window
Setting Values
Pickup value of V2
Operate delay
Dropout ratio
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
Times
Pickup times
Dropout time
Frequency Operating Range
0.9 ≤ f/f ≤ 1.1
rated
10 Hz ≤ f < 0.9 f
1.1 f < f ≤ 80 Hz
rated
f < 10 Hz
f > 80 Hz
Tolerances
Voltages
Time delays
30 OOT (Output Operating Time) additional delay of the output medium used, for example 5 ms with fast relays
SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual
C53000-G5040-C019-6, Edition 06.2016
rated
11.21 Overvoltage Protection with Negative-Sequence Voltage
1 cycle to 10 cycles
0.300 V to 200.000 V
0.00 s to 60.00 s
0.90 to 0.99
150 mV sec.
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
20 ms to 70 ms + OOT
(depends on the measuring-window length)
According to specified tolerances
Slightly expanded tolerances
Inactive
0.50 % of the setting value or 0.050 V
1.00 % of the setting value or 10 ms
Technical Data
Increments of 1 cycle
Increments of 0.001 V
Increments of 0.01 s
Increments of 0.01
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