HUW1
Series Intelligent Universal Circuit Breaker
12
6.4
Protection characteristics of the intelligent controller
6.4.1
Long time delay protection and curve
The long overload delay protection function is generally used to protect the cable from the overload based on the
true RMS of the current.
The long-delay action current is continuously adjustable, and the tripping time is of inverse time characteristic.
The adjustment step of the short-time key is 1A (2A for 2,000 A above).
Distribution protection current set value l
r
(0.4
–1.0) In+OFF
Current tolerance
±10%
Generator protection current set value l
r
(0.4
–1.25) In+OFF
Applied current I
Agreed tripping time
1.05I
r
>2h No trip
1.3I
r
<1h Trip
Type of protection
characteristics
Fault
current
Setting time Tr (s)
SI
Standard inverse
time lag
1.5I
r
0.61
0.98
1.47
2.46
3.68
4.91
6.14
9.21
11.05
17.19
24.56
36.84
49.13
61.41
73.69
85.97
2I
r
0.36
0.57
0.86
1.43
2.15
2.87
3.58
5.37
6.45
10.03
14.33
21.49
28.65
35.82
42.98
50.15
6I
r
0.14
0.22
0.33
0.55
0.82
1.1
1.37
2.06
2.47
3.84
5.48
8.22
10.96
13.7
16.45
19.19
7.2I
r
0.12
0.2
0.3
0.5
0.74
0.99
1.24
1.86
2.23
3.48
4.97
7.45
9.93
12.42
14.9
17.38
VI
Very inverse time
lag
1.5I
r
2
3.2
4.8
8
12
16
20
27
36.6
56
80
120
160
200
240
280
2I
r
1
1.6
2.4
4
6
8
10
13.5
18
28
40
60
80
100
120
140
6I
r
0.2
0.32
0.48
0.8
1.2
1.6
2
2.7
3.6
5.6
8
12
16
20
24
28
7.2I
r
0.16
0.26
0.39
0.65
0.97
1.29
1.61
2.18
2.9
4.52
6.45
9.68
12.9
16.13
19.35
22.58
EI
（
G
）
Extreme inverse
time lag (for general
distribution
protection)
1.5I
r
8
12.8
19.2
32
48
64
80
108
144
224
320
480
640
800
960
1000
2I
r
3.33
5.33
8
13.33
20
26.67 33.33
45
60
93.33 133.33
200
266.67 333.33
400
433.33
6I
r
0.29
0.46
0.69
1.14
1.71
2.29
2.86
3.86
5.14
8
11.43
17.14
22.86
28.57
34.29
37.14
7.2I
r
0.2
0.31
0.47
0.79
1.18
1.57
1.97
2.66
3.58
5.51
7.87
11.8
15.74
19.67
23.6
25.57
EI
（
M
）
Extreme inverse
time lag (for motor
protection)
1.5I
r
6.22
9.96 14.93 24.89 37.34 49.78 62.23 84.01 112.01 174.24 248.91 373.37 497.82 622.28 746.73 208.96
2I
r
2.95
4.72
7.07 11.79 17.69 23.58 29.48 39.79 53.06
82.53
117.9 176.86 235.81 294.76 353.71 383.19
6I
r
0.28
0.45
0.68
1.13
1.69
2.26
2. 82
3.81
5.08
7.9
11.29
16.94
22.58
28.23
33.88
36.7
7.2I
r
0.2
0.31
0.47
0.78
1.17
1.56
1.95
2.63
3.51
5.46
7.8
11.7
15.61
19.51
23.41
25.36
HV
High voltage fuse
compatibility
1.5I
r
2.46
3.94
5.91
9.85 14.77 19.69 24.62 33.23 44.31
68.92
98.46 147.69 196.92 246.15 295.38
320
2I
r
0.67
1.07
1.6
2.67
4
5.33
6.67
9
12
18.67
26.67
40
53.33
66.67
80
86.67
6I
r
0.01
0.01
0.02
0.03
0.05
0.06
0.08
0.1
0.14
0.22
0.31
0.46
0.62
0.77
0.93
1
7.2I
r
0
0.01
0.01
0.01
0.02
0.03
0.04
0.05
0.07
0.1
0.15
0.22
0.3
0.37
0.45
0.48
I
2
T
Universal inverse
time protection
1.5I
r
15
30
60
120
240
360
480
600
720
840
960
2I
r
8.44
16.88 33.75 67.5
135
202.5
270
337.5
405
472.5
540
6I
r
0.94
1.88
3.75
7.5
15
22.5
30
37.5
45
52.5
60
7.2I
r
0.65
1.3
2.6
5.21 10.42 15.63 20.83 26.04 31.25
36.46
41.67
Note 1: This table takes the set value of the long time delay action duration of the LCD intelligent controller as an example.
Note 2: Action time error ±15%
