Shihlin electric BA Series User Manual

ACB-I
16
I N S T R U C T I O N S
Controller oers six kinds of characteristic curve of overload protection, following the expression:
1. Standard inverse time: T=0.01396t/ (N
0.02
-1
)
2. Quick inverse time: T=t/ (N-1)
3. Super inverse time (general purpose): T=3t (N
2
-1)
4. Super inverse time (motor protection): T=2.95 t x In [N
2
/ (N
2
-1.15)]
5. High-voltage fuse compatibility: T=15t/ (N
4
-1)
6. Super inverse time 2(general pu
rpose): T=2.25 t/ N
2
Equal to T=t x (1.5 lr1/ l)
2
Serial
No.
Inverse time delay setting value of overload protection characteristic curve: t (s)
Delay trip time corresponding to 2lr1
Delay trip time
corresponding to
1.5lr1
Standard inverse
time curve 1
Quick inverse time
curve 2
Super inverse time
(general purpose)
curve 3
Super inverse time
(motor protection)
curve 4
High-voltage fuse
compatibility
curve 5
Super inverse
time 2 (general
purpose) curve 6
1
0.36 1.00 3.32 2.94 0.66 15
2 0.58 1.60 5.32 4.72 1.06 20
3 0.86 2.40 8.00 7.06 1.60 25
4 1.42 4.00 13.32 11.78 2.66 30
5 2.14 6.00 20.00 17.68 4.00 40
6 2.86 8.00 26.66 23.58 5.32 50
7 3.58 10.00 33.32 29.46 6.66 60
8 5.36 13.50 45.00 39.78 9.00 80
9 6.44 18.00 60.00 53.04 12.00 100
10 10.02 28.00 93.32 82.52 18.66 120
11 14.32 40.00 133 117 26.66 160
12 21.48 60.00 200 176 40.00 200
13 28.64 80.00 266 235 53.32 240
14 35.80 100 333 294 66.66 320
15 42.98 120 400 353 80.00 400
16 50.14 140 433 383 86.66
480
Calculate illustration:
Assume the setting conditions of a controller as, Curve 3 is the characteristic curve of overload long time delay
protection, lr1, tl are 2000A and 20.00s respectively. Calculate the time of overload long time delay TL when the actual
fault current is 3000A.
N=l/lr1=3000/2000=1.5
TL=3 Tl/ ( N
2
-1) =3 x 20/ (1.5×1.5-1) =48s
Therefore, here TL is 48s.
Table 9: 6 kinds of inver
se time delay setting value of overload protection characteristic curve
Moreover,
T is time value of actual protection delay.
t is setting value of inverse time delay, all setting values of inverse time delay shown in Table 3.
N=l/lr1, it is ratio of actual working current to setting current value of overload long time delay.
5.2 Controller (IEC 60255 standard)
5.2.1 Overload protection curve

Shihlin electric BA Series Specifications

General

Brand	Shihlin electric
Model	BA Series
Category	Circuit breakers
Language	English