CHINT NA1, Руководство пользователя

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S
ingle-phase protection is usually used in neutral-point solid ground system. Controller has two different protection modes, being vector
sum mode and external transformer mode.
3
PT mode
Contr
-oller
In three-phase three-wire system using 3-pole breaker without external transformer, earthing fault signal comes from three- phase current
vector sum. Operating characteristic is definite time protection.
(3 P+N)T mode
In three-phase four-wire system using 3-pole breaker with external N-pole transformer, earthing fault signal comes from three- phase and
N-Pole current vector sum. Operating characteristic is definite time protection.
In three-phase four-wire system using 4-pole breaker without external transformer , earthing fault signal comes from three- phase current
and N-Pole current vector sum. Operating characteristic is definite time protection.
4
PT mode
Note:
① External N-pole transformer (connected to 6#, 7# terminal for NA1-1000, connected to 25#, 26# terminal for NA1-2000-6300) is a special product. Default lead wire is
2 meters long.
② Earthing protection in 3PT mode can only be used in balance load. It should be turned off or set value above allowable unbalance current when the load is unbalance or
the controller may operate.
③ The distance between external transformer and breaker should be less than 5m in (3P+N)T mode. When lead wire of external transformer needs to be longer than 2 meters,
special requirement should be noted when ordering.
Contr
-oller
Contr
-oller
0.1
0.06
0.2
0.14
0.3
0.25
0.4
0.33
±15%
±15%
Current Ratings
Range(I
g )
tolerance Current
Time
tolerance
Note:
Operating characteristics of single-phase earthing protection
Action time(s)
Inm=1000/2000，
(0.2~0.8)In+ OFF
Inm=3200/4000/6300,
(500~1200)A+ OFF
±10%
≤0.9Ig
＞1.1Ig
t g
Returnable time
In the 2 tg Non - tripping
In the tg
±
0.032 s or tg (1±25%) Tripping
a. When t g is 0.1s or 0.2s, time permissible error is ±0.040s;
b. When Inm is 1000A, Ig should be more than 100A. When Inm is 2000A, Ig shouldn' t be more than 1200A.
c. When Inm is 3200A, 4000A or 6300A, Ig should be between 500A and 1200A.
Earthing protection characteristic curve
14.4.5 Earthing protection
Earthing protection has definite time characteristic. Fault delay time is shown below.
0.01
0.1
1
10
100
1000
0.1 1 10
T
(
s
)
I ( xIn )
0.1
0.4
0.3
0.2
Ig=(0.2~0.8)In
，
min 100A ， max 1200A
或500A~1200A
Type
Rated control power voltage Us(V)
NA1-1000 X
AC230, 400
NA1-2000 X /NA1-2000 X N/NA1-2000 X H/NA1-3200 X /NA1-3200 X N/NA1-4000 X /NA1-6300 X /NA1-6300 X N
AC400, 230, 127 DC220, 110
(0.35-0.7)Us
(0.85-1.1)Us
≤0.35Us
20VA 48VA
Action voltage(V)
Reliable making voltage(V)
Reliable non-making voltage(V)
Power loss(W)
15. Accessories
15.1 Under-voltage release
Without power supply, under-voltage release can't close.
It is classified into instantaneous and time-delay type.
Delay time 1s, 3s, 5s, 7s are fixed for NA1-1000; 1s, 3s, 5s are fixed for NA1-2000, 3200, 4000, 6300.
Within 1/2 time-delay range, circuit breaker does not trip when power voltage recovers and exceeds 85%Ue.
Characteristic
Optional configure: Auto suction type under-voltage release, and this device can substitute normal one, it can pr e vent mechanism form
misoperation.
Make sure there is power supply on the under-voltage release, before making the circuit breaker.
48W
C
NA1
Air Circuit Breaker
P-088 P-087 NA1
Air Circuit Breaker