Intermittent Ground Fault Protection - Siemens SIPROTEC 4 User Manual

4.18

Intermittent Ground Fault Protection

Intermittent Ground Fault Protection
Pickup Threshold
with Ι
N
with 3Ι0
with Ι
Ns
Pickup extension time T
Ground Fault Accumulation Time T
Reset Time for Accumulation T
Number of Pickups for Intermittent Ground Fault 2 to 10
Times
Pickup Times
– Current = 1.25 x Pickup Value
– for ≥ 2 · Pickup Value
Dropout Time (without extension time)
Tolerances
Pickup threshold Ιie>
Times T , T , T
V sum
Influencing Variables
Power supply direct voltage in range 0.8 ≤ V
Temperature in range 23.00 °F (-5 °C) ≤ Θ
Frequency in range 25 Hz to 70 Hz
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
for Ι
Nom
for Ι
Nom
for Ι
Nom
for Ι
Nom
for Ι
Nom
for Ι
Nom
v
sum
res
for Ι = 1 A 3 % of setting value or 10 mA
Nom
for Ι = 5 A 3 % of setting value or 50 mA
Nom
res
amb
0.05 A to 35.00 A
= 1 A
0.25 A to 175.00 A
= 5 A
0.05 A to 35.00 A
= 1 A
0.25 A to 175.00 A
= 5 A
0.005 A to 1.500 A
= 1 A
0.025 A to 7.500 A
= 5 A
0.00 s to 10.00 s
0.00 s to 100.00 s
1 s to 600 s
approx. 30 ms
approx. 22 ms
approx. 22 ms
1 % of setting value or 10 ms
/V ≤ 1.15
PS PSNim
≤ 131.00 °F (55 °C)
Technical Data
4.18 Intermittent Ground Fault Protection
Increments 0.01 A
Increments 0.01 A
Increments 0.01 A
Increments 0.01 A
Increments 0.001 A
Increments 0.001 A
Increments 0.01 s
Increments 0.01 s
Increments 1 s
Increments 1
<1 %
<0.5 %/ K
<5 % relating to the set time
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