S14  transformer cores

I. Iron Core Material

The iron core of the S12 transformer is generally made of cold-rolled grain-oriented silicon steel sheets with high magnetic permeability. These silicon steel sheets undergo a special cold-rolling process, which makes the grains highly oriented along the rolling direction, thus possessing excellent magnetic properties.

II. Performance Characteristics

1. Outstanding Permeability

• It has a very high permeability, which means that a relatively strong magnetic induction intensity can be generated under a low magnetic field strength. During the operation of the transformer, this characteristic helps to reduce the exciting current, lower the no-load loss, and improve the efficiency of the transformer.

2. Extremely Low Iron Loss

• Iron loss includes hysteresis loss and eddy current loss. Due to the use of high-quality cold-rolled grain-oriented silicon steel sheets, the S12 transformer iron core has a very narrow hysteresis loop and a small hysteresis loss. Meanwhile, the thin sheet structure of the silicon steel sheets and the insulating coating on the surface can effectively limit eddy currents, making the eddy current loss also very low, thus greatly reducing the energy loss of the transformer.

3. Good Magnetic Stability

• Under different working temperatures and load variations, the magnetic properties of the iron core can remain relatively stable. This makes the output voltage and current of the transformer more stable, effectively reducing voltage fluctuations and waveform distortions, and providing higher-quality electrical energy for the power system.

III. Iron Core Structure

1. Laminated Structure

• The S12 transformer iron core usually adopts a laminated structure. Silicon steel sheets are laminated together one by one, and there is an insulating layer between each sheet. This structure can effectively reduce the flow path of eddy currents and lower the eddy current loss. The laminated structure is also convenient for manufacturing and installation, and the size and shape of the iron core can be flexibly adjusted according to the specific specifications and requirements of the transformer.

2. Three-Phase Iron Core Structure (for Three-Phase Transformers)

• For three-phase transformers, the iron core mainly consists of three limb cores and upper and lower yokes. The three-phase windings are respectively sleeved on the three limb cores. This structural design can make the distribution of the three-phase magnetic fields more uniform, reduce the losses caused by unbalanced magnetic circuits, and ensure the balanced operation among the three phases of the transformer.

IV. Manufacturing Process

1. Silicon Steel Sheet Processing

• First, the silicon steel sheets are cut. The coiled silicon steel sheets are cut into appropriate sizes and shapes according to the designed dimensions. During the cutting process, accuracy needs to be ensured to ensure the tightness and accuracy of the subsequent laminations. In some cases, punching may also be required for the silicon steel sheets to make holes for installing windings and other components.

2. Insulation Treatment

• In order to prevent short circuits between silicon steel sheets and an increase in eddy current losses, the surface of the silicon steel sheets needs to be insulated. Usually, an insulating paint is coated on the surface of the silicon steel sheets or other insulating materials are used to ensure good insulation performance between adjacent silicon steel sheets.

3. Iron Core Lamination

• The silicon steel sheets after insulation treatment are laminated in a specified order and direction. During the lamination process, attention should be paid to ensuring the flatness and tightness of the laminations to avoid uneven or loose laminations, otherwise, the magnetic and mechanical properties of the iron core will be affected.

4. Clamping and Fixing

• The laminated iron core needs to be clamped and fixed by means of clamps or binding after lamination to ensure the stability of the iron core structure. This can prevent the iron core from being displaced or deformed due to electromagnetic forces and other factors during the operation of the transformer.