Low Voltage Current Transformer
(Low Tension Current Transformer)
Model: LMK1-0.5, LMKJ1-0.5
(for 0.5kV and lower Electric Power System)
1. Summarize:
Model LMK1-0.5,LMKJ1-0.5 series Current transformer, with insulated full close-in plastic case, it is indoor type, apply to 50Hz, not more than 0.5kV electric power system, as measure current, energy and relay protect using.
2. Technical data
2.1 Confirm to IEC and GB1208-1997 Standard, the main technical parameter as following:( cosφ＝0.8)
| Model |
Rated Primary Current
(A) |
Primary ampere-turn |
Rated Capacity
(VA) |
Rated current value that Primary Need Several Circles
(A) |
| Class 0.2 |
Class 0.5 |
Class 1 |
| LMK1-0.5 |
5,15,25,75 |
75 |
2.5 |
5 |
10 |
5~25 |
| 5,10,20,25,50,100 |
100 |
5~50 |
| 5,10,15,30,50,75,150 |
150 |
5 |
5 |
10 |
5~75 |
| 20,40,100,200 |
200 |
20~100 |
| 300,400,500,600 |
300~600 |
|
| LMKJ1-0.5 |
5,10,20,40,50,100,200 |
200 |
10 |
10 |
15 |
5~100 |
| 5,10,15,30,50,75,150,300 |
300 |
5~150 |
| 20,40,100,200,400 |
400 |
5~200 |
| 500,600,750,800,1000 |
500~1000 |
|
2.2 CT hole size, cable size and primary loop number see following table:
| Model |
Rated Primary current
(A) |
Primary ampere turn |
Hole size |
Cable size |
Primary loop number |
| LMK1-0.5 |
5,15,25,75 |
75 |
Φ25 |
20×3 |
5A(15circle),15A(5circle),25A(3circle),75A(1circle) |
| 5,10,20,25,50,100 |
100 |
Φ30 |
25×3 |
5A(20circle),10A(10circle),20A(5circle),50A(2circle) |
| 5,10,15,30,50,75,150 |
150 |
5A(30circle),10A(15circle),15A(10circle),30A(5circle),50A(3circle),75A(2circle),150A(1circle) |
| 20,40,100,200 |
200 |
20A(10circle),40A(5circle),100A(2circle),200A(1circle) |
| 300 |
300 |
Φ35 |
30×4 |
1circle |
| 400 |
400 |
Φ45 |
40×5 |
| 500,600 |
500,600 |
53×9 |
50×6 |
| LMKJ1-0.5 |
5,10,20,25,40,50,100,200 |
200 |
Φ30 |
25×3 |
5A(40circle),10A(20circle),20A(10circle),25A(8circle)
40A(5circle),50A(4circle)100A(2circle),200A(1circle) |
| 5,10,20,25,30,50,75,100,150,300 |
300 |
Φ35 |
30×4 |
5A(60circle),10A(30circle),15A(20circle),20A(15circle),25A(12circle),30A(10circle)
50A(6circle),75A(4circle),100A(3circle),150A(2circle),300A(1circle) |
| 40,200,400, |
400 |
Φ45 |
40×5 |
40A(10circle),200A(2circle),400A(1circle) |
| 500,600 |
500,600 |
53×9 |
50×6 |
1circle |
| 750,800,1000 |
750,800,1000 |
63×12 |
60×8 |
2.3 Rated Secondary current: 5A or 1A |
