Siemens SIPROTEC 7SK80 User Manual

Technical Data
4.2 Definite-Time Overcurrent Protection 50(N)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
345
4.2 Definite-Time Overcurrent Protection 50(N)
Operating Modes
Measuring Method
Setting Ranges / Increments
Times
Dropout Ratio
Tolerances
Three-phase Standard
Two-phase Phases A and C
All elements First harmonic, r.m.s. value (true RMS)
51Ns-3 Additional instantaneous values
Pickup current 50–1, 50–2 (phases) forI
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 current 50–3 (phases) for I
Nom
= 1A 1.0A to 35.00A or ∞ (disabled)
for I
Nom
= 5 A 5.0 A to 175.00 A or ∞ (disabled)
Pickup Current 50N–1, 50N–2
(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)
Pickup Current 50N–3 (ground) for I
Nom
= 1 A 0.25 A to 35.00 A or ∞ (disabled)
for I
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
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 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
Pickup times 3 % of setting value or 15 mA at I
Nom
= 1 A
or 75 mA at I
Nom
= 5 A
Time delays T 1 % or 10 ms

Siemens SIPROTEC 7SK80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SK80
Category	Protection Device
Language	English