Technical Data
4.17 Intermittent Ground Fault Protection
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
517
4.17
Intermittent Ground Fault Protection
Setting Ranges / Increments
Times
Tolerances
Influencing Variables
Pickup Threshold
with
I
N
with 3
I
0
with
I
Ns
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
Increments 0.01 A
Increments 0.01 A
Increments 0.01 A
Increments 0.01 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
Fault
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 set 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 0.95
≤
f/f
Nom
≤
1.05
<5% relating to the set time
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