S20  transformer cores

I. Iron Core Material

The iron core of the S20 transformer is mainly composed of high-quality cold-rolled grain-oriented silicon steel sheets. These silicon steel sheets are manufactured under strict production processes, and their grains are neatly arranged along the rolling direction, which provides an excellent foundation for the magnetic properties of the iron core.

II. Performance Characteristics

1. High Permeability

• The iron core of the S20 transformer has outstanding permeability. This enables it to generate a relatively strong magnetic induction intensity under a lower magnetic field strength. When the transformer is in operation, a smaller exciting current can generate a sufficient magnetic field, which helps to reduce the no-load loss and thus improve the working efficiency of the transformer.

2. Low Iron Loss

• Iron loss mainly includes hysteresis loss and eddy current loss. The cold-rolled grain-oriented silicon steel sheets used in this iron core have a narrow hysteresis loop and a small hysteresis loss. Moreover, the thin sheet structure and good surface insulation of the silicon steel sheets can effectively reduce the eddy current loss. The combination of these two aspects keeps the iron loss of the iron core at a low level and reduces the energy loss of the transformer.

3. Good Magnetic Stability

• Whether under different working temperatures or varying load conditions, the S20 transformer iron core can maintain stable magnetic properties. This ensures the stability of the output voltage and current of the transformer, reduces voltage fluctuations and waveform distortions, and provides stable and reliable electrical energy for the power system.

III. Iron Core Structure

1. Laminated Structure

• The iron core of the S20 transformer usually adopts a laminated structure. Silicon steel sheets are stacked one by one, and there is an insulating layer between each sheet. This structure can greatly reduce the flow path of eddy currents and effectively reduce the eddy current loss. Meanwhile, the laminated structure is convenient for manufacturing and installation, and the size and shape of the iron core can be flexibly adjusted according to the requirements of the transformer.

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

• In a three-phase transformer, the iron core consists of three limb cores and upper and lower yokes. The three-phase windings are respectively sleeved on the three limb cores. This structure 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 of the three phases of the transformer.

IV. Manufacturing Process

1. Silicon Steel Sheet Processing

• First of all, the silicon steel sheets need to be processed. The coiled silicon steel sheets are cut into appropriate sizes and shapes according to the designed dimensions. During the cutting process, precision should be ensured to ensure the tightness and accuracy of the subsequent laminations. Sometimes, punching is also required for the silicon steel sheets to make holes for installing windings and other components.

2. Insulation Treatment

• To avoid short circuits between silicon steel sheets and an increase in eddy current losses, the surface of the silicon steel sheets needs to be insulated. Generally, 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, it is necessary to ensure the flatness and tightness of the laminations to prevent uneven or loose laminations, otherwise, it will affect the magnetic and mechanical properties of the iron core.

4. Clamping and Fixing

• After the iron core is laminated, it needs to be clamped and fixed by means of clamps or binding 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.