How to use enameled wire in current transformer winding
Enameled wire is primarily used in current transformers for winding the primary and secondary windings. The primary winding is connected in series with the circuit under test, with a relatively small number of turns, usually only one or a few turns. The secondary winding has a greater number of turns and is connected to measuring instruments and protection circuits. When the current transformer is in operation, the primary winding carries the current from the circuit under test, while the secondary winding generates a proportionally reduced current, which is used for instrument measurement and protective devices.
The functions of enameled wire include:
- Current Transmission: As part of the winding, enameled wire is responsible for transmitting the large current from the primary side to the reduced current on the secondary side.
- Insulation Protection: The insulation layer of the enameled wire ensures electrical isolation between windings, preventing current leakage and short circuits, thereby safeguarding both equipment and personnel.
- Efficiency Improvement: High-quality enameled wire helps reduce resistance and energy loss, enhancing the operating efficiency of the current transformer.
Learn more types of enameled wire
Best enameled wire for current transformer windings
Depends on several factors, including
Transformer winding type
Rewinding transformers
Design of transformer
Output transformers power
Construction and winding,etc.
Also depends on main specifications enameled wire (How to make enameled wire for current transformer windings?)
- Material
- Insulation Type
- Thermal Class
- Wire Gauge
How do Current Transformer Work?
A current transformer (CT) basically has a primary coil with one or more turns of weight cross-sectional area. In some cases, a rod carrying a high current can act as a primary. It is connected in series with a line carrying a high current. The secondary part of the CT consists of a large number of thin wires with a small cross-sectional area. This is usually rated as 5A. This is connected to the coil of the normal range ammeter. According to their application in the field, current transformers can be roughly divided into indoor current transformers and outdoor current transformers. According to the insulation method, current transformers can be divided into tape insulation and pouring resin (epoxy, polyurethane or polyethylene).
For most current transformer applications, enameled copper wire with Polyesterimide (PEI) or Polyamideimide (PAI) insulation is recommended, especially when operating in higher temperature environments. The specific choice will depend on your application’s thermal requirements, operating environment, and desired performance characteristics.