Siemens SIPROTEC 7ST6, Руководство пользователя, Страница: 268 / 356

4 Technical Data
268
7ST6 Manual
E50417-G1176-C251-A3
4.3 Time Overcurrent Protection
Very High Set Current Stage, High Set Current Stage and Definite-time Overcurrent Stage
1)
The currents are specified in secondary values for I
N
= 1 A. With I
N
= 5 A, currents must be
multiplied by 5.
Inverse-time Overcurrent Stage (IEC)
Inverse-time Overcurrent Stage (ANSI)
High-Speed Overcurrent Protection
Pickup value I
1)
0.10 A to 25.00 A;
∞
Increments 0.01 A
Delay time T I 0.00 s to 30.00 s;
∞
Increments 0.01 s
Dropout to pickup ratio Approx. 0.95 for I/I
N
≥
0.5
Pickup time Approx. 1 cycle + 10 ms
Dropout time Approx. 1–2 cycles
Pickup value IP 0.10 A to 4.00 A;
∞
Increments 0.01 A
Delay time T IP 0.05 s to 3.00 s;
∞
Increments 0.01 s
Dropout to pickup ratio Approx. 0.91 for I/I
N
≥
0.5
Pickup time Approx. 1 cycle + 10 ms
Dropout time Approx. 1–2 cycles
Pickup value IP 0.10 A to 4.00 A;
∞
Increments 0.01 A
Delay time D IP 0.50 s to 15.00 s;
∞
Increments 0.01 s
Dropout to pickup ratio Approx. 0.91 for I/I
N
≥
0.5
Pickup time Approx. 1 cycle + 10 ms
Dropout time Approx. 1–2 cycles
Pickup value I HS O/C 1.0 A to 25.0 A;
∞
Increments 0.01 A
Delay time HS O/C 0 ms; 6 ms to 100 ms;
∞
Increments 1 ms
Dropout to pickup ratio Approx. 0.95
Pickup time
≤
2ms
Dropout time Approx. 1–2 cycles
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