A current transformer (CT) is a type of transformer used to measure alternating current. It generates a current proportional to its primary current in the secondary. The transformer adjusts the larger voltage or current value to a small standardized value that is easy to handle, which is used for measuring instruments and Protective relay. The transformer isolates the measurement or protection circuit from the high voltage of the main system. The secondary current provided by the current transformer is accurately proportional to the current flowing out from its primary.
| Application area | type | Picture for reference |
| Leakage protection | Zero sequence/residual current transformer |  |
| Current monitoring of AC motors, lighting equipment, air compressors, and heating, ventilation, and air conditioning devices, electrical energy management, and automatic control systems for buildings | Open circuit transformer |  |
| AC current measurement and protection of instruments and meters | Transformer for terminals/concentrators/energy meters |  |
| Current monitoring of AC motors, lighting equipment, air compressors, and heating, ventilation, and air conditioning devices, electrical energy management, and automatic control systems for buildings | Current transformers for motor protection |  |
| Electricity meter and other electric energy measurement with high accuracy and small phase error requirements | Current transformers for electricity meters |  |
| Variable frequency speed control, servo motor DC motor, power supply device, switch power supply, UPS power supply, welding machine | CURRENT SENSOR |  |
| It is used in the on-line insulation monitoring device of high-voltage electrical equipment in the substation to accurately transfer the mA leakage current of transformer bushing, current transformer, Voltage transformer, coupling capacitor, lightning arrester and other high-voltage equipment | AC leakage current transformer |  |
Post time: Jun-08-2023
