Define transformer windings and their functions
The transformer winding is the core part of the transformer and is made of conductive material (usually copper or aluminum wire). The main function of the winding is to realize the conversion and transmission of electromagnetic energy. In a transformer, the primary winding generates an alternating magnetic field through alternating current, which in turn induces the electromotive force of the secondary winding, thereby realizing the voltage rise and fall conversion. In addition, the windings also play a role in connecting the power source and the load, ensuring that electrical energy can be transmitted smoothly in the power system.
Basic structure and components of winding
Transformer windings usually consist of wires, insulation layers, support structures and lead wires.
Wire: The main material from which the winding is wound, usually copper or aluminum wire with high electrical conductivity. The cross-sectional shape and size of the conductor are selected according to the capacity and current of the transformer.
Insulation layer: used to isolate the conductive parts between different windings to prevent electrical breakdown and short circuit. Insulating materials should have good electrical properties and heat resistance.
Support structure: used to fix and support the winding to ensure the stability and mechanical strength of the winding. Support structures are usually made of insulating materials such as cardboard, fiberglass, etc.
Lead wire: used to connect the winding to the external circuit. The lead wire is usually installed at the end of the winding and connected to the external cable or busbar through an insulating sleeve.
Types of transformer windings
1. Layer winding
Layer winding, also known as laminated winding, is a winding form in which wires are stacked layer by layer. Each layer of windings is made up of wires arranged in parallel, separated by insulating material, and then the next layer is stacked on top of each other. The structure of this winding form is relatively simple and easy to manufacture. Since there is a certain air gap between each layer of windings, the heat dissipation performance is better, which can effectively prevent the windings from overheating. However, due to the low space utilization of layered windings, their capacity is relatively small under the same volume.
2. Pancake winding
Pancake winding is a structure in which wires are wound into a disk shape, and each layer is composed of multiple such disk-shaped structures. This winding form has a high space utilization rate, can make full use of the winding volume and increase the capacity of the transformer. In addition, due to the high mechanical strength of the pie winding, it can withstand large electromagnetic forces and is suitable for high voltage and large capacity transformers. However, the heat dissipation performance of pancake windings is relatively poor and additional heat dissipation measures need to be taken.
3. Continuous winding
Continuous winding is an uninterrupted form of winding in which the wires are wound continuously without separation between layers. This winding form has a compact structure, good electromagnetic properties, and can reduce leakage flux and eddy current losses. In addition, the manufacturing of continuous windings is relatively difficult and requires high-precision winding equipment and processes. Due to the continuity of the winding, its heat dissipation performance is also subject to certain limitations, and appropriate heat dissipation measures need to be taken.
4. Tangled winding
Tangled winding is a form of winding with cross-tangles between adjacent layers. Through the cross-entanglement between adjacent layers, the electromagnetic coupling between windings can be improved and the leakage flux can be reduced, thereby improving the efficiency of the transformer. However, the manufacturing process of entangled windings is complicated and requires high-precision winding equipment and processes. In addition, due to the cross-tangle of windings, its heat dissipation performance is also affected to a certain extent, and appropriate heat dissipation measures need to be taken.