Development of Transformer Core Materials

Development of transformer iron core material

Transformers are an important electrical component used in the transmission and distribution of electric power. It is mainly composed of an iron core and a coil winding. It transforms high voltage or low voltage, or changes alternating current or three-phase alternating current into one or three phases. The transformers iron core material plays a key role in ensuring that the transformer works properly.

Iron core materials used in transformers mainly include high silicon steel sheet (HIESS), grain oriented silicon steel sheet (GOESS), amorphous core, nanocrystalline core and so on. As time changes, the development of transformer iron core materials is also generating more and more news and improvements.

High silicon steel sheet is the most widely used transformer iron core material in China. It is mainly used in small, medium and large power transformers. Because of its low magnetic hysteresis loss and low core loss, it is easy to be widely accepted. Hi-Si steel sheet has great economical advantages, low production cost and large production capacity. However, due to its large and heavy size, it is not easy to carry and install.

Grain oriented silicon steel sheet (GOESS) is another type of transformer iron core material used in China. It is mainly used in small and medium power transformers. It has the advantages of high magnetic induction intensity, large specific resistivity, small thickness and light weight. But compared with the high silicon steel sheet, its production cost is higher, the production capacity is smaller, and it is easy to be affected by external magnetic field.

Amorphous core is another kind of transformer iron core material. It has the advantages of low core loss, high magnetic intensity and low working power consumption. Its structure is also very simple, but its cost and hardness are significantly higher than traditional materials.

Nanocrystalline core is a kind of transformer core material with magnetic induction intensity higher than amorphous core. Its processing costs, size and weight are also lower than conventional core materials. However, its sensitivity to external magnetic field and its isolation ability to produce harmonics are lower than conventional materials.

In recent years, the development of transformer iron core materials has been particularly rapid. With the progress of the manufacturing technology of transformer core materials, the improvement of their performance indicators and the further development of environmental protection concept, the performance and environmental protection of core materials have been greatly improved, and the quality and safety of transformers have been improved. Chinese transformer manufacturers have improved their core material design, making it more suitable for different application occasions.

In the future, transformer iron core materials will continue to develop, and all kinds of novel materials, such as nanometer thin and thin will appear. With the good effect on core loss, size and noise reduction, these new materials will bring more options for transformer manufacturers and consumers. In addition, with the improvement of related technologies and standards, the application of transformer core materials will become more and more extensive and mature.

The development of transformer core materials

Transformer is a kind of electrical equipment widely used in power system, whose core material is one of its key core components. The development of transformer core material reflects a countrys level of science and technology. As the scientific and technological progress, so does the development of transformer core materials.

In the past, the core materials of transformers were mainly made of cold-rolled silicon steel sheets, and the loss of it was very high. In order to solve the problem of high loss, the research and development of electromagnetic steel was opened up. The new core material has less eddy current loss followed by hysteresis loss. And in order to meet the increasingly high requirements of isolation level, temperature rise and sound level of electrical equipment, the studies on new core materials such as amorphous alloy and nanocrystalline alloy has been conducted.

At present, amorphous alloy core is a kind of new composite material of nanometer grade, which has low loss, low noise, low temperature rise and high insulation performance, and can replace silicon steel sheet transformer well. Nanocrystalline alloy core is a new core material composed of nanocrystalline and soft magnetic alloy with high saturation magnetic induction intensity, low hysteresis loss, low coercive force and strong magnetic anisotropy.

Compared with the traditional cold-rolled silicon steel core transformer, the use of new core materials not only improves the overall performance of the transformer, but also reduces the size and weight, improves the overload capacity and extended the life-span of the transformer.

Therefore, with the development of science and technology, the transformer core material is improving and progress day by day, which is conducive to the improvement of performance of the transformer, and more needs to be fully explored and study.