CT/PT Transformer Production Line
1. Silicon steel sheet cutting: laser or CNC punching, ensuring the precision of core lamination. Annealing treatment (partially for certain CTs): optimizing magnetic properties and reducing losses. Ring core winding (for special CTs such as Rogowski coils): automated winding, minimizing air gaps.
2. CT: Multi-layer precision winding, controlling the turns ratio (such as 5A/1A output). PT: Sectional winding, ensuring voltage division accuracy (such as 10kV/100V).
3. Epoxy resin impregnation enhances moisture resistance and thermal endurance. The curing oven dries it, forming a uniform insulating layer.
4. The core and coil assembly (CT must ensure magnetic circuit closure). Install shielding layer (to prevent partial discharge).Aluminum cast housing (outdoor type), plastic casing (indoor type). Silicone rubber outer jacket (anti-pollution flashover type).
5. Electrical performance testing and Environmental testing
6. Smart labels: QR codes trace production batches and test data. foam plus wooden crates, suitable for long-distance transportation.
Features
1. High precision winding: • The error of the secondary coil turns of the CT ≤ 0.1%, and the voltage division ratio error of the PT ≤ 0.2%.
2. Insulation reliability: • No bubbles or cracks in the epoxy resin (detected by X-ray).
3. Automated calibration: • The automatic test bench completes tests such as transformation ratio, polarity, and withstand voltage with one button.
Application
1. Power system: electric energy measurement, relay protection.
2. Industrial electricity usage: motor current monitoring, variable frequency drive current monitoring.
3. New energy: grid connection testing of photovoltaic inverters and wind power converters.
Through automated production lines, the production cycle of current transformers can be shortened by 50%, while precision is improved to 0.1 grade (traditional hand winding usually achieves 0.5 grade), meeting the high-precision sensing requirements of smart grids.
