Definite-time Overcurrent Protection
Operating Modes
Three-phase Standard
Two-phase Phases A and C
Measuring Method
All elements First harmonic, rms value (true rms)
50-3, 50N-3 Instantaneous values
Setting Ranges / Increments
Pickup current phases
for Ι
N
= 1 A
0.10 A to 35.00 A or ∞ (disabled) Increments
0.01 A
for Ι
N
= 5 A
0.50 A to 175.00 A or ∞ (disabled)
Pickup currents ground
for Ι
N
= 1 A
0.05 A to 35.00 A or ∞ (disabled) Increments
0.01 A
for Ι
N
= 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
Times
Pickup times (without inrush restraint, with restraint + 1 period)
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
Dropout ratio for
- first harmonic, rms value
- instantaneous value
approx. 0.95 for Ι/Ι
Nom
≥ 0.3
approx. 0.90 for Ι/Ι
Nom
≥ 0.3
Tolerances
Pickup currents
2 % of setting value or 10 mA at Ι
Nom
= 1 A
or 50 mA at Ι
Nom
= 5 A
Delay times T 1 % or 10 ms
Influencing Variables for Pickup and Dropout
Power supply direct voltage in range 0.8 ≤ V
PS
/V
PSNom
≤ 1.15 1 %
Temperature in range 23.00 °F (-5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) 0,5 %/10 K
4.2
Technical Data
4.2 Definite-time Overcurrent Protection
450 SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
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