Overvoltage Protection with Zero-Sequence Voltage/Residual
Voltage
Setting Values
Method of measurement RMS value
Fundamental component
Fundamental component
over 2 cycle filters
Block. on measuring-voltage outage Yes
No
Determ. ph. aff. by grd. flt. Yes
No
Threshold value
120
0.300 V to 340.000 V Increments of 0.001 V
Time delay 0.00 s to 60.00 s Increments of 0.01 s
Pickup delay 0.00 s to 320.00 s Increments of 0.01 s
Dropout ratio 0.90 to 0.99 Increments of 0.01
V< faulty ph-gnd vltg. 0.300 V to 200.000 V Increments of 0.001 V
V> healthy ph-gnd. vltg. 0.300 V to 200.000 V Increments of 0.001 V
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
Standard filter, true RMS
Approx. 25 ms + OOT
121
at 50 Hz
Approx. 22 ms + OOT at 60 Hz
2 cycle filters Approx. 45 ms + OOT at 50 Hz
Approx. 39 ms + OOT at 60 Hz
Dropout time
Standard filter, true RMS Approx. 20 ms + OOT at 50 Hz
Approx. 17 ms + OOT at 60 Hz
2 cycle filters Approx. 31 ms + OOT at 50 Hz
Approx. 27 ms + OOT at 60 Hz
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
12.30
120
If you have selected the method of measurement = RMS value, do not set the threshold value under 10 V.
121
OOT (Output Operating Time): additional delay of the output medium used, see Chapter 12.1.4 Relay Outputs
Technical Data
12.30 Overvoltage Protection with Zero-Sequence Voltage/Residual Voltage
SIPROTEC 5, Overcurrent Protection, Manual 1509
C53000-G5040-C017-8, Edition 07.2017
To Next Page
Loading...
