Tolerances for Stage Type Inverse-Time Overvoltage Protection
Voltages 0.5 % of the setting value or 0.05 V
Operate time for
1.2 ≤ V/V threshold value ≤ 20
5 % of the setting value or 30 ms
Reset time delay 1 % of the setting value or 10 ms
Overvoltage Protection with Positive-Sequence Voltage
Setting Values
Pickup value 0.300 V to 200.000 V Increments of 0.001 V
Time 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
Operate time with time delay = 0 ms, typical
Approx. 25 ms + OOT
51
at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Operate time with time delay = 0 ms, maximum Approx. 30 ms + OOT at 50 Hz
Approx. 26 ms + OOT at 60 Hz
Dropout time, typical Approx. 25 ms + OOT
Dropout time, maximum Approx. 30 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 ≤ 90 Hz
Slightly expanded tolerances
f < 10 Hz
f > 90 Hz
Active
Tolerances
Voltages
0.5 % of the setting value or 0.05 V
Time delays 1 % of the setting value or 10 ms
Overvoltage Protection with Negative-Sequence Voltage
Setting Values for the Function
Measuring window
1 cycle to 10 cycles Increments of 1 cycle
11.19.2
11.19.3
51
OOT (Output Operating Time): additional delay of the output medium used, see Chapter 11.1.4 Relay Outputs
Technical Data
11.19 Voltage Protection
958 SIPROTEC 5, Low-Impedance Busbar Protection, Manual
C53000-G5040-C019-C, Edition 04.2021
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