DC immune current transformers are important components for energy meters and other electrical instruments. Based on the technology of high permeability and high saturation induction soft magnetic material, we can provide DC immune current transformer cores of good linearity. The CT core usually consists of a nanocrystalline ring and an amorphous ring. Thus, the dual core has the advantage of high permeability and high saturation induction.
Each piece of Xianyu toroidal DC immune CT core an iron-based nanocrystalline and amorphous dual core, protected by high-grade plastic case. The proportion of each part is carefully calculated according to experiments and treated by seperated annealing process with or without magnetic field. So, we can take the advantage of each material and make the final dual cores with excellent linearity.
For our nanocrystalline and amorphous core, the curie temperature (Tc) is 570 °C and 400 °C, both are much higher than that of ferrite core. So, our DC immune composite cores have good thermal stability.
We can make customized cores for a variety of DC immune current transformers. The most popular composite cores are used for miniature current transformers with max. current range from 10A to 200A. But we can also provide high current type DC immune CT core for applications under current up to 600A for different kinds of residential meters or energy meters.
Toroidal core, or round core, is the most popular type of soft magnetic cores, as it has the advantage of nearly no leakage magnetic flux. We make the ring core by ultra thin ribbon with high stacking factor, which allow us to provide mini composite core of very compact size.
Our automatic ribbon winding machines make the competitive price possible in large-scale production. For requirements of customized DC immune cores, we can provide samples based on quick prototype technology within a couple of days.
DC Immune Current Transformer Core
Features
- Toroidal amorphous & nanocrystalline core inside
- Good linearity over the whole primary current range
- Max current range from 10A to 600A
- Direct coil winding available
- High initial permeability and low losses
- High saturated induction
- Stable temperature character, very low temperature drift
- AL value specified by customers
- Quick prototype development for customized cores
- DC immune according to IEC 62053, EN 50470-3
- Suitable for residential meters of different accuracy class
Applications
- Current transformers
- Electricity meters
- Current sensing
- Circuit protection
Basic Parameters
| Structure | Toroidal Inner & Outer Dual Core |
| Usage | Current Sensing |
| Description | DC Immune Current Transformer Core |
| Material A | Iron-based Nanocrystalline 1k107 |
| Material B | Iron-based Amorphous 1K101 |
| Finish Type | Plastic Box / Epoxy Resin Coating |
| Color | White / Black |
| Weight | Approx. 5~200 g |
| AL Value | Specified by Customers |
| Application | 10~600A DC Immune CT |
| Accept Customized | Yes |
Magnetic Properties
Nanocrystalline
| Item | Performance | Item | Performance |
|---|---|---|---|
| Saturation induction (Bs) | 1.2 T | Hardness (Hv) | 880 |
| Curie temperature (Tc) | 570 °C | Resistance ratio (δ) | 130 µΩ·cm |
| Crystalline temperature (Tx) | 500 °C | Thickness | 18~28 µm |
| Initial permeability(µ0) | >12×104 | Density (ρ) | 7.2 g/cm3 |
| Saturation magnetostriction (λs) | 2.0×10-6 | Stacking factor | ≥0.8 |
Amorphous
| Item | Performance | Item | Performance |
|---|---|---|---|
| Saturation induction (Bs) | 1.56 T | Hardness (Hv) | 960 |
| Curie temperature (Tc) | 400 °C | Resistance ratio (δ) | 130 µΩ·cm |
| Crystalline temperature (Tx) | 515 °C | Coercivity (Hc) | <4 A/m |
| Saturation magnetostriction (λs) | 27×10-6 | Density (ρ) | 7.18 g/cm3 |
Specifications
| Model | ID (mm) | OD (mm) | HT (mm) | Iron cross section (cm2) | Mean path length (cm) | Weight (g) |
|---|---|---|---|---|---|---|
| CP14-19-8B | 14 | 19 | 8 | 0.15 | 5.2 | 10.5 |
| CP14-20-10A | 14 | 20 | 10 | 0.23 | 5.3 | 11.5 |
| CP16-21-10B | 16 | 21 | 10 | 0.19 | 5.8 | 13.8 |
| CP16-25-10A | 16 | 25 | 10 | 0.34 | 6.4 | 21.5 |
| CP17-22-10A | 17 | 22 | 10 | 0.19 | 6.1 | 12.7 |
| CP17-24-8A | 17 | 24 | 8 | 0.21 | 6.4 | 12.7 |
| CP19-27-8A | 19 | 27 | 8 | 0.24 | 7.2 | 15.2 |
| CP19-27-8B | 19 | 27 | 8 | 0.24 | 7.2 | 16.5 |
| CP19-28-10A | 19 | 28 | 10 | 0.34 | 7.4 | 21.7 |
| CP20-30-6.5A | 20 | 30 | 6.5 | 0.24 | 7.9 | 17.9 |
| CP20-30-8A | 20 | 30 | 8 | 0.3 | 7.9 | 20 |
| CP40-50-20A | 40 | 50 | 20 | 0.75 | 14.1 | 95 |
| CP47-64-16A | 47 | 64 | 16 | 1.02 | 17.4 | 140 |
| CP48-60-15A | 48 | 60 | 15 | 0.68 | 17 | 86 |
| CP50-60-10A | 50 | 60 | 10 | 0.38 | 17.3 | 69 |
| CP50-60-12A | 50 | 60 | 12 | 0.45 | 17.3 | 79 |
Note:
The above data are selected from some popular models we produce. Please contact us for detail datasheet. We can also design some special DC immune amorphous & nanocrystalline cores to meet customers’ requirements.