Nanocrystalline cores
Current Transformer
Precision Current Transformers for Safe and Accurate Monitoring
Precision Current Transformer Cores for Smart Energy Monitoring
Engineered with Fe-based Nano crystalline and Amorphous hybrid materials, these cores provide excellent magnetic performance and immunity to DC and harmonic fields.
Product Overview
Current Transformer (CT) cores are essential components used for precise current measurement in energy meters and protection systems. These cores reduce high currents to safer, measurable levels while maintaining accurate proportionality. Commonly paired with voltage transformers (VT or PT), CTs are key components in instrument transformers used across power monitoring and metering systems.
Technical Specifications
| Characteristic | Parameter |
|---|---|
| Working Frequency | 50-60Hz |
| Turn Ratio | 1:2500 (+/- 2%) |
| Overload current | Imax x 1.5 |
| DC and even harmonics | Imax/√2 as per IEC 62053-21, IEC 62053-23, 1inductive , error should be less than ±3%@PF=1.0 |
| Copper Winding | SWG 38- 41 |
| Insulation Withstand | 4000V 50Hz/60 Sec, leakage current <1mA |
Electrical Error Performance
Parameter | 5% Rated Current | 20% Rated Current | 100% Rated Current | Imax |
Current (Ratio) Error % | -0.4 ~ +0.4 | -0.2 ~ +0.2 | -0.1 ~ +0.1 | -0.1 ~ +0.1 |
Phase (Angle) Error % | — | -15 ~ +15 | -13 ~ +13 | -10 ~ +10 / -8 ~ +8 |
Dimensions & Customization
Flexible customization options are available to meet specific application and assembly requirements, including wire color, connector type, insulation material, and wire configuration. CT body labeling can also be tailored with manufacturer logo, drawing number, and production date for complete traceability and branding.
Standard Range & Dimensions
| Current Rating (A) | Max OD [A] (mm) | Min ID [B] (mm) | Max Ht [C] (mm) | Wire length [D] (mm) | DC immune | Magnet Shield | Primary BusBar |
|---|---|---|---|---|---|---|---|
| 5-10A | 24.5 | 6.5 | 14 | 100 | No | No | No |
| 5-30A | 29 | 8 | 16 | 100 | Yes | No | No |
| 5-60A | 31 | 9.5 | 16 | 100 | Yes | No | Yes |
| 5-60A | 36 | 9.5 | 22 | 100 | Yes | Yes | No |
| 5-80A | 26.5 | 8 | 11 | 100 | No | No | Yes |
| 5-100A | 36.5 | 10.5 | 23 | 100 | Yes | Yes | No |
| 5-120A | 42.5 | 11.5 | 23 | 100 | Yes | Yes | No |
| 5-200A | 79.5 | 39.5 | 28 | 150 | Yes | Yes | No |
| 5-320A | 46 | 26 | 14 | 150 | No | No | No |
Scope of Application
1
Multifunctional electronic energy meters (50Hz)
2
Anti-tampering smart meters
3
Digital meters and transducers
4
Remote data acquisition and relay protection systems
5
Digital devices and panel meters
Operating Conditions
Parameter | Specification |
Temperature | -40°C to +85°C |
Relative Humidity | Up to 95% |
Altitude | ≤1000m |
Environment | Free from corrosive gases, dust, steam, and explosive media |
Material Construction
Parameter | Specification |
Core | Fe-based Nanocrystalline & Amorphous hybrid |
Winding | SWG 38–41 Copper |
Secondary Wire | PVC or PTFE (customer-defined) |
Optional Features | Twist type, insulation sleeve, connector, and wire length customization |
Immunity & Compliance
Parameter | Specification |
Magnetic Immunity | As per EN50470-3 (0.5mT AC, 1.2T DC from Neo magnet at 25mm) |
Accuracy Class | 0.1–0.5 |
Compliance | UL / ROHS compliant |
Dielectric Strength | 4000V (50Hz/60 sec, <1mA leakage) |
Standards | IEC-60044-1, IEC 62053-21, IEC 62053-23, and IS13779 compliant |
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