Siemens 7SK80 - Load Jam Protection

Technical Data
4.12 Load Jam Protection
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
387
4.12 Load Jam Protection
Setting Ranges / Increments
Timers
Dropout ratio
Tolerances
Influencing variables
Tripping threshold for I
Nom
= 1 A 0.50 A to 12.00 A Increments 0.01 A
for I
Nom
= 5 A 2.50 A to 60.00 A
Alarm threshold for I
Nom
= 1 A 0.50 A to 12.00 A Increments 0.01 A
for I
Nom
= 5 A 2.50 A to 60.00 A
Trip delay 0.00 s to 600.00 s Increments 0.01 s
Message delay 0.00 s to 600.00 s Increments 0.01 s
Blocking duration after motor start 0.00 s to 600.00 s Increments 0.01 s
Pickup time approx. 55 ms
Dropout time approx. 30 ms
Dropout ratio tripping stage approx. 0.95
Dropout ratio warning stage approx. 0.95
Pickup threshold for I
Nom
= 1 A 3 % of setting value or 15 mA
for I
Nom
= 5 A 3 % of setting value or 75 mA
Time delay 1 % or 10 ms
Power supply direct voltage in range 0.8 ≤ V
PS
/V
PSNom
≤ 1.15 1 %
Temperature in range –5 °C ≤ Θ
amb
≤ 55 °C 0.5 %/10 K
Frequency in the range from 25 Hz to 70 Hz
Frequency in the range of 0.95 ≤ f/f
Nom
≤ 1.05 (f
Nom
= 50 Hz or 60 Hz) 1 %
Frequency outside range of 0.95 ≤ f/f
Nom
≤ 1.05 Increased tolerances
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1%
1%