SCB20  transformer cores

Iron Core Material

The iron core of the Scb20 transformer mainly adopts high-quality cold-rolled grain-oriented silicon steel sheets. These silicon steel sheets are manufactured through special cold-rolling processes, and their internal grains are neatly arranged along the rolling direction, providing an excellent foundation for the magnetic properties of the iron core.

Performance Characteristics

• High Permeability

• The iron core has a relatively high permeability and can generate a relatively strong magnetic induction intensity under a relatively small magnetic field strength. This enables the transformer to establish a sufficient magnetic field with only a small exciting current during operation, effectively reducing the no-load loss and improving the working efficiency of the transformer.

• Low Iron Loss

• Iron loss mainly includes hysteresis loss and eddy current loss. The cold-rolled grain-oriented silicon steel sheets used in the Scb20 transformer 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 combined effect of these two factors keeps the iron loss of the iron core at a low level and reduces the energy loss during the operation of the transformer.

• Excellent Magnetic Stability

• Whether under different working temperatures or load variations, the iron core can maintain stable magnetic properties. This is of great importance for maintaining the stability of the output voltage and current of the transformer, effectively reducing voltage fluctuations and waveform distortions, and providing stable and reliable electrical energy for the power system.

Iron Core Structure

• Laminated Structure

• A laminated structure is usually adopted. Silicon steel sheets are stacked one by one, and there is an insulating layer between every two sheets. This structure can significantly reduce the flow path of eddy currents and thus 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.

• 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.

Manufacturing Process

• 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.

• 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. 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.

• Iron Core Lamination

• The silicon steel sheets after insulation treatment should be laminated in a specified order and direction. During the lamination process, it is necessary to ensure the flatness and tightness of the laminations to avoid uneven or loose laminations, otherwise, it will have an adverse impact on the magnetic and mechanical properties of the iron core.

• 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.