The LFS-12 current transformer is a 12kV indoor single-phase device, designed with epoxy resin casting insulation and a fully enclosed support structure. It integrates the primary and secondary windings along with the annular magnetic core into a compact resin-molded body, ensuring high dielectric strength, mechanical durability, and long-term operational stability in medium-voltage environments.
Equipped with two secondary windings—one for measurement and one for protection—the LFS-12 is widely applied in power systems for accurate current measurement, electric energy metering, and protective relaying. It operates at 50Hz or 60Hz and meets international standards including IEC 60044-1 and IEC 61869-1 & 2. It is suitable for indoor switchgear and control equipment with a maximum voltage of 12kV.
| Rated current ratio (A) | Secondary accuracy classes combination | Rated output (VA) |
FS | ALF | Rated short-time thermal current (kA/S) | Rated dynamic current (kA) | ||
| Measuring | Protective | |||||||
| 0.2(S) | 0.5 | 10P | ||||||
| 5~200/5 |
0.2(S)/0.2(S) 0.2(S)/0.5 0.2(S)/10P 0.5/10P |
10 15 |
15 | 15 |
5 (10) |
10 | 80I1n | 200I1n |
| 300/5 | 20 | 50 | ||||||
| 400/5 | 30 | 75 | ||||||
| 500/5 | 30 | 75 | ||||||
| 600/5 | 40 | 80 | ||||||
| 800/5 | 40 | 80 | ||||||
| 1000/5 | 63 | 105 | ||||||
