ACB-OB
12
AIR CIRCUIT BREAKER
4.2 Earthing Protection
4. Characteristic Curves
4.1 Overload, Short-circuit, Instantaneous Protection
0.1
1
0.02
0.05
0.01
0.5
0.2
1
2
5
t(s)
10
20
100
50
5000
2000
1000
500
10000
10
6
8
4
3
2
5
20
xI
r
xIn
10
6
8
4
3
5
20
30
I
r
=0.4…1×In
t
r
=5~250s
I
sd
=1.5~10×I
r
I
2
t ON
I
2
t OFF
I
i
=2~15I
n
0.1s
0.2s
0.3s
0.4s
0.1s
0.2s
0.3s
0.4s
200
(T
sd
)
(T
sd
)
I
g=(0.2~1.0)
I
n+OFF
Earthing Protection
characteristic Current
1
t(s)
11
6
8
4
3
2
5
20
1.5
50
0.1
s
0.02
s
0.05
s
0.01
s
0.5
s
0.2
s
1
s
2
s
5
s
10
s
20
s
1
min
30
s
2
min
4
min
6
min
10
min
14
min
20
min
30
min
1
h
2
h
x
I
g
Tg=0.1s
Tg=0.2s
Tg=0.4s
Tg=0.8s
Summary of Contents for BW-2000
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