Technical Data
4.11 Load Jam Protection
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
343
4.11 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 2 % of setting value or 10 mA
for I
Nom
= 5 A 2 % of setting value or 50 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 23.00 °F (-5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) 0.5 %/10 K
Frequency in range f
Nom
± 5 Hz 1 %
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1%
1%
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