As a professional Current Transformer manufacturer and supplier in China, Comewill offers high-quality Current Transformer systems that are in stock and available for customized orders. Designed for power system measurement, monitoring, and protection, our Current Transformers convert high primary currents into measurable secondary currents while providing electrical isolation. With stable performance, compact design, and precise measurement, Comewill Current Transformers ensure reliable operation across industrial, utility, and renewable energy applications.
A Current Transformer (CT) is an electrical device that converts large primary currents into smaller, measurable secondary currents through the principle of electromagnetic induction. The primary winding, with few turns, is connected in series with the line, while the secondary winding, with more turns, is connected to measurement instruments or protection circuits. By maintaining a low-impedance closed secondary circuit, Current Transformers allow safe monitoring and control of high-voltage power lines, avoiding direct measurement hazards and enabling accurate protection and data collection.
Current Transformers operate by electromagnetic induction. The ratio of the primary current to the secondary current is called the actual current ratio, with the rated current ratio denoted as Kn=I1n/I2n. This enables precise scaling of high currents, for example, converting 400A primary current to 5A secondary current for meters or protection relays. Miniature or instrument Current Transformers provide milliampere-level outputs for laboratory or data acquisition use, bridging high-power systems and sensitive measuring instruments.
Current Transformers are compact, durable, and capable of precise current conversion. Their main advantages include:
1. Accurate Measurement – High reliability ensures protection and monitoring of complex power systems.
2. Electrical Isolation – Safely separates high-voltage circuits from measurement devices.
3. Versatile Output – Secondary currents suitable for analog meters or digital instruments.
4. Wide Range – Supports currents from a few amperes to tens of thousands of amperes, suitable for various industrial and utility applications.
1） Dry type current transformer: It is insulated with ordinary insulation material that has been dipped in paint.
2）Cast in place current transformer: a current transformer molded by casting epoxy resin or other resin mixed materials.
3）Oil immersed current transformer: insulated with insulating paper and insulating oil, generally outdoor type.
4）Gas insulated current transformer: The main insulation is composed of gas.
1）Through type current transformer: a current transformer used to pass through a panel or wall.
2）Pillar type current transformer: a current transformer installed on a plane or pillar and used as a primary circuit conductor pillar.
3）Sleeve type current transformer: a type of current transformer that is directly mounted on an insulated sleeve without a primary conductor or insulation.
4）Busbar current transformer: a type of current transformer that does not have a primary conductor but has a primary insulation and is directly installed on the busbar for use.
| Feature | Current Transformer (CT) | Voltage Transformer (VT) |
| Function | Measures current and converts current | Measures voltage and converts voltage |
| Working Principle | Based on electromagnetic induction or Hall Effect | Based on voltage division principle |
| Applications | Power system protection, monitoring, and metering | Power system voltage measurement and protection |
| Output Form | Current signal (usually 5A or 1A) | Voltage signal (usually 110V or 100V) |
| Accuracy Requirements | High accuracy and reliability | High accuracy and reliability |
Comewill Current Transformers are widely applied in:
1. Power System Protection and Monitoring: Real-time current measurement for substations, transmission, and distribution lines.
2. Smart Grids: Data acquisition for grid load management and automated monitoring.
3. Renewable Energy: Measuring current in wind farms and solar arrays.
4. Industrial Automation: Monitoring current fluctuations in production lines and industrial machinery.
As a China-based manufacturer and supplier, Comewill provides wholesale, customized, and in stock Current Transformers, ensuring high quality, timely delivery, and adherence to global standards. Buyers sourcing Current Transformers can rely on Comewill for reliable, precise, and safe current measurement solutions.
