SCB11  transformer cores

I. Iron Core Material

The iron core of the Scb11 transformer usually adopts high-quality cold-rolled grain-oriented silicon steel sheets. These silicon steel sheets have undergone special cold-rolling processes, and their internal grains are highly orderly arranged along the rolling direction. This makes the silicon steel sheets possess excellent magnetic properties, which is a key factor for the iron core to obtain good performance.

II. Performance Characteristics

1. High Permeability

• The iron core has a high permeability and can generate a relatively strong magnetic induction intensity under a relatively small magnetic field strength. When the transformer is in operation, only a small exciting current is needed to establish a sufficient magnetic field, thus effectively reducing the no-load loss and improving the operation 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 the Scb11 transformer iron core have a narrow hysteresis loop and a small hysteresis loss. Meanwhile, the thin sheet structure and good surface insulation coating of the silicon steel sheets help to reduce the eddy current loss. These factors keep the iron loss of the iron core at a low level and help to reduce the energy loss during the operation of the transformer.

3. Good Magnetic Stability

• Under different working temperatures and load variations, the iron core can maintain relatively stable magnetic properties. This characteristic is very important 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.

III. Iron Core Structure

1. Laminated Structure

• A laminated iron core structure is usually adopted. Silicon steel sheets are laminated together one by one, and there is an insulating layer between each sheet. This structure can significantly reduce the flow path of eddy currents and thus effectively reduce the eddy current loss. Besides, 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 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

• Firstly, the silicon steel sheets need to be processed. The coiled silicon steel sheets are cut into appropriate sizes and shapes according to the design requirements. During the cutting process, high 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

• 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, it will have an adverse impact on 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.