AIR CIRCUIT BREAKERS
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9
ACB
CHARACTERISTIC OF THE INTELLIGENT CONTROLLER
Current ratings
Range (Ir2)
Error
Current
Actions Time
Time Error
(1~15)Ir1
+OFF
(OFF Position)
±10%
≤0.9Ir2
Non-trip
>1.10Ir2
Delayed-trip
Time setting (ts)
0.1
0.2
0.3
0.4
±15%
Returnable Time
0.06
0.14
0.23
0.35
±15%
Short-circuit short-delay protection
Current Ratings Range (Ir3)
Error
Current
Action Characteristic
1.0 In~50A/ 75kA/100A
+OFF (OFF Position)
± 15%
≤0.85lr3
Non-trip
>1.15lr3
Trip
Short-circuit instantaneous protection
Current ratings
Range (Ir1)
Error
Current
Actions Time
Time Error
(0.4~1)In
±10%
≤1.05Ir1
<2h Non-trip
>1.30Ir1
<1h trip
1.51 Ir1 (setting time)
15
30
60
120
240
480
±10%
2.0Ir1
8.4
16.9
33.7
67.5
135
270
±10%
Overload long time-delay protection
Phase N Overload and Over-Current Characteristic 100% or 50% (Applicable to 3p+N or 4P)
30 40 50 60 70 80 100
.2 .3 .4 .5 .6 .8 1
2 3 4 5 6 8 10 20
x ln
t (a)
kA
10000
5000
2000
1000
500
200
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
Ir1=(0. 4
~
1)In
Tr=(15
~
480)s
I
2
t
off
Ir2=(I.0
~I5)Irl
0.4s
0.3s
0.2s
0.1s
Ir3=1.0In
~
50kA/75kA/100kA
Over-current protection characteristic curve
ACMIDPAV