CHINT NA1-1000, Catalogue

Page: 48 / 64

Panels
Mechanical reset button
Mark for rated current
Window for voltage meter
Window for current meter
Indication to protective type
Protective property curve
Status indication
Functional key
Communication indicator
Programming interface
Key lock
Note: When the breaker tripped for controller, user should
push the mechanical reset button on the controller
panel, then the breaker can be switch-on.
. 4 2 .
±
10%
±
15%
≤
0.85Ir3
＞
1.15Ir3
Current Ratings
Range(lr4)
Current Ratings Range(lr3)
Error
Error
Current
Current
Action Time Time Error
0.1
0.06
0.2
014
0.3
0.23
0.4
0.35
±
15%
±
15%
Non-trip
trip
Short circuit instantaneous protection
1.0 ln~50kA/
75kA/100kA
+OFF (OFF Position)
Action Characteristic
Note: When the controller is of structure I (lnm=2000A), the instantaneous protection setting is 1.0 ln~50 KA+OFF; when the controller is of
structure II (lnm=3200A) and structure III (lnm=6300A), the instantaneous protection setting is 1.0 ln~75 KA+OFF; the special order can
achieve 100kA+OFF.
f. Earth fault protection
The earth fault protection has definite time-delay characteristic with the failure delayed time no less than the definite time-delay time setting.
Earth fault Protection Characteristic Curve
1000
500
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
t(s)
.05 .06 .08 .1 .2 .3 .4 .5 .6 .8 1 2 3 4 5 6 8 10 20 30
xIn
Ir4=(0.2~0.8)In
0.4s
0.3s
0.2s
0.1s
0.4s
0.3s
0.2s
0.1s
Single phase earth fault protection technical data:
(0.2~0.8)ln
+OFF (OFF position)
(NA1-2000, min160A)
≤
0.8 lr4
>1.0 lr4
Setting time (Tg)
Returnable time
Non-tripping
Tripping
Wiring diagram of the earthing fault protection
3PT type
4PT type
L1
L2
L3
CT
Intelligent
Controller
L1
L2
L3
CT
N
Intelligent
Controller
(3P+N) T type
L1
L2
L3
CT
N
Intelligent
Controller
. 4 3 .
0 I
t
0 I
t
Earth fault/residual current protection Selective protection
Air Circuit Breaker
14.2.2 The communication
H
type intelligent controller
As the core part of the NA1 Air Circuit Breaker, the H type intelligent controller could protect the electric circuit from overload, short circuit,
single-phase earthing fault and residual current, etc. With the highly-integrated and highly-performance digital signal processor, the H type
intelligent controller could have real time processing on signals and realize various protective functions and multiple auxiliary functions,
especially the function of communicating with PC.
Appearance and panel illustration