Siemens 7SK80 - Intermittent Ground Fault Protection

Technical Data
4.16 Intermittent Ground Fault Protection
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
395
4.16 Intermittent Ground Fault Protection
Setting Ranges / Increments
Times
Tolerances
Influencing Variables
Pickup threshold
with INom
with 3I0
with INs
for I
Nom
= 1 A
for I
Nom
= 5 A
for I
Nom
= 1 A
for I
Nom
= 5 A
for I
Nom
= 1 A
for I
Nom
= 5 A
0.05 A to 35.00 A
0.25 A to 175.00 A
0.05 A to 35.00 A
0.25 A to 175.00 A
0.005 A to 1.500 A
0.025 A to 7.500 A
Increments 0.01 A
Increments 0.01 A
Increments 0.01 A
Increments 0.01 A
Increments 0.001 A
Increments 0.001 A
Pickup extension time T
v
0.00 s to 10.00 s Increments 0.01 s
Ground Fault Accumulation Time T
sum
0.00 s to 100.00 s Increments 0.01 s
Reset Time for Accumulation T
res
1 s to 600 s Increments 1 s
Number of Pickups for Intermittent Ground Faults 2 to 10 Increments 1
Pickup Times
– Current = 1.25 x Pickup Value
– for ≥ 2 · Pickup Value
Dropout Time (without extension time)
Approx. 30 ms
Approx. 22 ms
Approx. 22 ms
Pickup threshold I
Times T
V
, T
sum
, T
res
3 % of setting value or 10 mA for I
Nom
= 1 A
or 50 mA for I
Nom
= 5 A
1 % of setting value 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 %/ K
Frequency in range 25 Hz to 70 Hz <5% relating to the set time