Siemens SIPROTEC 7SJ61, Руководство пользователя, Страница: 350 / 454

Technical Data
4.14 Intermittent Ground Fault Protection
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
350
4.14 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 –5 °C
≤ Θ
amb
≤
55 °C <0.5 %/ K
Frequency in range 0.95
≤
f/f
Nom
≤
1.05 <5% relating to the set time