Siemens SIPROTEC 7SJ61 - Definite-Time Overcurrent Protection 50(N)

Technical Data
4.2 Definite-Time Overcurrent Protection 50(N)
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
318
4.2 Definite-Time Overcurrent Protection 50(N)
Operating Modes
Measuring Technique
Setting Ranges / Increments
Times
Dropout Ratio
Three-phase Standard
Two-phase Phases A and C
All elements First harmonic, rms value (true rms)
50-3, 50N-3 Instantaneous values
Pickup current phases for I
Nom
= 1 A 0.10 A to 35.00 A or ∞ (disabled) Increments 0.01 A
for I
Nom
= 5 A 0.50 A to 175.00 A or ∞ (disabled)
Pickup currents ground for I
Nom
= 1 A 0.05 A to 35.00 A or ∞ (disabled) Increments 0.01 A
for I
Nom
= 5 A 0.25 A to 175.00 A or ∞ (disabled)
Delay times T 0.00 s to 60.00 s or ∞ (disabled) Increments 0.01 s
Dropout delay times 50 T DROP-OUT, 50N T
DROP-OUT
0.00 s to 60.00 s Increments 0.01 s
Pickup times (without inrush restraint, with restraint add 10 ms)
First harmonic, rms value
- for 2 x setting value
- for 10 x setting value
Instantaneous value
- for 2 x setting value
- for 10 x setting value
approx. 30 ms
Approx. 20 ms
approx. 16 ms
approx. 16 ms
Dropout Times
First harmonic, rms value
Instantaneous value
approx. 30 ms
approx. 40 ms
Dropout ratio for
- first harmonic, rms value
- instantaneous value
approx. 0,95 for I/I
Nom
≥ 0.3
approx. 0,90 for I/I
Nom
≥ 0.3