CHINT NA1-2000X User Manual

7.6.2 Short-circuit short time-delay overcurrent protection characteristic.
7.6.1 Long time-delay overcurrent protection characteristic
Rated current range [IR]
Error
Current [I]
Time error
Example 1: If it is known that in condition of I=6I ,
R
The tripping time setting value is 2s,
and now the circuit current I=1.5I ,
R
then the actual tripping time T can be worked out by:
R
(1.5I )2×T =(6I )2×2. The answer is obtained as T =32s
R R R R
Rated current range [Isd]
Error
Current [I]
Operating time [tsd(s)]
Time error
(1.5~10)I
R
+OFF(Power off)
No action
Time-delay action
2 2
anti-time-limit delay:I Tsd=(10I ) tsd
R
Example 2: If it is known that the short-time delay
setting current is Isd=3I ,
R
then the tripping time is set as tsd=0.2s
in the setting position of inverse
2
time limit (1 t ON). Now the current is 7I
R
in the line current, then the short-time delay tripping time
can be worked out by calculation:
1.5Isd=1.15×3I =3.45I
R R
Then I=7I ＞1.15Isd
R
And because I=7I ＜10I
R R
2 2
So accotding to I ×Tsd=(10I) tsd
2 2
(7I ) ×Tsd=(10I ) ×0.2
R R
Tsd=0.41s
Heat capacity measurement
Standard type (M type)
Multifunction type (H type)
P Function
1.Voltage measurement;
2.Voltage unbalance measurement;
3.Frequency measurement;
4.Phase sequence measurement;
5.Electric energy measurement;
6.Power measurement;
7.Power factor measurement;
8.Earth-current grounding protection;
9.Leakage protection;
10.Load monitoring function;
11.Quadruple D0 output function;
12.DI input function;
13.Regional interlocking function;
14.Under and over voltage protection;
H Function
None
1.Voltage measurement;
2.Voltage unbalance measurement;
3.Frequency measurement;
4.Phase sequence measurement;
5.Electric energy measurement;
6.Power measurement;
7.Power factor measurement;
8.Earth-current grounding protection;
9.Leakage protection;
10.Load monitoring function;
11.Quadruple DO output function;
12.DI input function;
13.Regional interlocking function;
14.Under and over voltage protection;
15.Measurement of harmonic current;
16.Neutral phase protection
T(s)
X In
0.1 0.2 0.3 0.4
0.6
1 2 3 4 5 6 8 10 20 30
0.05
0.8
10000
5000
1000
500
200
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
Ig=(0.2-1)In
MAX 1200A
MIN 120A
2
I ON
2
I t OFF
0.5
Overcurrent protection characteristics
Neutral line (earthing) fault protection characteristic
7.6 Characteristic parameters of the standard type intelligent controller
T(s)
X IR
0.2
0.3
0.6
1 2 3 4 5 8 10 20
30
50 80
0.5
0.8
40 60
10000
5000
1000
500
200
100
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
T =(1~30)s
R
8
10 20 3021.5
4
3
5
6
2
I t ON
Isd=（1.5~10）IR
IR=(0.4-1)In
Ii=（2~15)In
2
I t OFF
Isd=（1.5~10）IR
(0.4~1)In
±10%
≤1.05I
R
>1.30I
R
1.5IR
2.0IR
6.0IR
No actuation within 2h
Operating time [tR(s)]
＜1h and then actuate
16
9
1
32
18
2
64
36
4
128
72
8
192
108
12
256
144
16
320
180
20
384
216
24
480
270
30
±15%
±15%±15%
0.1 0.2 0.3 0.4
0.1 0.2 0.3 0.4
<0.85Isd
>1.15Isd
2
I t OFF
2
I t ON
I>10IR
2
I t ON
I≤10IR
NA8G
Air Circuit Breaker
P-032
P-031
NA8G
Air Circuit Breaker
Explanation for parameter setting
Current of long time-delay overcurrent protection: I =(0.4-
R
0.5-0.6-0.7-0.8-0.9-0.95-0.98-1)×In, optional.
The long-time delay tripping time represents the inverse-
time limit characteristic, and nine optional settings are
readily available for tripping time in case of 6IR:TR=(1-2-4-8-
12-16-20-24-30)s.
For setting, insert a small slotted screwdriver to the knob
groove as shown in the right drawing, gently turn it to make
the arrow of the knob point at the current and time set as
required. As shown in the figure, the over current long time
delay protection current setting value I =0.6In, and the delay
R
tripping time is 2s (in the condition of 6I ).
R
Explanation for parameter setting
Current of short-circuit short time-delay overcurrent
protection : Isd=(1.5-2-2.5-3-4-5-6-8-10)×I , optional.
R
There are nine settings for the short-circuit short time-delay
tripping time, wherein 4 settings represent the definite-time
2
limit characteristic (i.e., I t OFF), 4 seetings the inverse-time
limit characteristic, and 1 setting the function of closing the
short- circuit short time-delay (X).
When the tripping time is set as definite-time limit operating
characteristic (i.e., the arrow points at the off area), the
tripping time can be selected as tsd=(0.1s-0.2s-0.3s-0.4s-x (i.e.,
the function of closing the short-time delay).
When the tripping time is set as inverse-time limit operating
2
characteristic(i.e., I t ON), there are two cases: ①the case of
1＞1.15Isd and 1＞10I represents the definite-time limit; ②
R
the case of 1＞1.15Isd and I≤10I represents the inverse-time
R
limit characteristic and the actual tripping time is calculated
2 2
according to the formula I Tsd=(10I ) tsd, where in I is the line
R
current, Tsd the actual tripping time, and tsd the setting
tripping time. The method for setting the current and time
for the short-circuit short time-delay overcurrent protection
is similar to that for over long time-delay overcurrent
protection. As shown in the figure, the current for the short-
circuit short time-delay overcurrent protection is 3I , and the
R
tripping time is set as tsd=0.2s in the setting position of
2
inverse time limit (I t ON).

CHINT NA1-2000X Specifications

General

Brand	CHINT
Model	NA1-2000X
Category	Circuit breakers
Language	English