Siemens siprotec 7SA522 - Page 473

4.15 Undervoltage and Overvoltage Protection (optional)
473
7SA522 Manual
C53000-G1176-C155-3
Undervoltage Phase–Phase
Undervoltage Positive Sequence System U
1
Undervoltage U
PhPh
<< 1.0 V to 175.0 V Increments 0.1V
Delay T
UPhPh<<
0.00 s to 100.00 s; ∞ Increments 0.01 s
Undervoltage U
PhPh
< 1.0 V to 175.0 V Increments 0.1V
Delay T
UPhPh<
0.00 s to 100.00 s; ∞ Increments 0.01 s
Drop-off to pick-up ratio Approx. 1.05
Current criterion Can be switched on/off
Pickup time Approx. 35 ms (50 Hz) / approx. 30 ms (60 Hz)
Drop-off time 30 ms
Tolerances Voltages 3 % of setting value or 1 V
Times 1 % of setting value or 10 ms
Undervoltage U
1
<< 1.0 V to 100.0 V Increments 0.1V
Delay T
U1<<
0.00 s to 100.00 s; ∞ Increments 0.01 s
Undervoltage U
1
< 1.0 V to 100.0 V Increments 0.1V
Delay T
U1<
0.00 s to 100.00 s; ∞ Increments 0.01 s
Drop-off to pick-up ratio Approx. 1.05
Current criterion Can be switched on/off
Pickup time Approx. 35 ms (50 Hz) / approx. 30 ms (60 Hz)
Drop-off time 30 ms
Tolerances Voltages 3 % of setting value or 1 V
Times 1 % of setting value or 10 ms