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 50–1, 50–2 (phases)
for Ι
Nom
= 1 A
0.10 A to 35.00 A or ∞ (disabled) Increments 0.01 A
for Ι
Nom
= 5 A
0.50 A to 175.00 A or ∞ (disabled)
Pickup current 50–3 (phases)
for Ι
Nom
= 1 A
1.0 A to 35.00 A or ∞ (disabled)
for Ι
Nom
= 5 A
5.0 A to 175.00 A or ∞ (disabled)
Pickup Current 50N–1, 50N–2
(ground)
for Ι
Nom
= 1 A
0.05 A to 35.00 A or ∞ (disabled) Increments 0.01 A
for Ι
Nom
= 5 A
0.25 A to 175.00 A or ∞ (disabled)
Pickup Current 50N–3 (ground)
for Ι
Nom
= 1 A
0.25 A to 35.00 A or ∞ (disabled)
for Ι
Nom
= 5 A
1.25 A to 175.00 A or ∞ (disabled)
Time delays T 0.00 s to 60.00 s or ∞ (disabled) Increments 0.01 s
Dropout time delays 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 times
for Ι
Nom
= 1 A
3 % of setting value or 15 mA
for Ι
Nom
= 5 A
3 % of setting value or 75 mA
Time delays T 1 % or 10 ms
4.2
Technical Data
4.2 Definite-time Overcurrent Protection
SIPROTEC 4, 7SJ80, Manual 363
E50417-G1140-C343-A8, Edition 12.2017
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