Technical Data
4.2 Definite-Time Overcurrent Protection 50(N)
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
479
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
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