Oil-immersed transformer core

The core of an oil-immersed transformer is one of its core components. It is mainly made of stacked silicon steel sheets and has excellent magnetic conductivity and low hysteresis loss. The main function of the core is to form a magnetic circuit, support the winding, and ensure the stable operation of the transformer. The core consists of a core column, a yoke, and a clamping device. The core column is the part of the winding, while the yoke is responsible for connecting the core columns to form a closed magnetic circuit. The clamping device is used to clamp the core, clamp the winding, and fix the lead wire.

In order to reduce the hysteresis and eddy current losses in the core, the core usually uses silicon steel sheets with a thickness of 0.35~0.5 mm, and applies insulating paint on its surface or uses a surface oxide film to insulate the sheets from each other. In addition, the design and manufacturing process of the core will also affect its performance. For example, the three-dimensional arrangement of equilateral triangles can reduce the air gap and make the magnetic circuit more compact, thereby reducing losses and noise.

Oil-immersed transformers are important equipment used in power systems to change voltage and transmit electrical energy. In the structure of the transformer, the iron core is an indispensable component, and its main functions are as follows:

1. Magnetic circuit conduction: The iron core is the magnetic circuit part of the transformer, which can effectively conduct the magnetic field generated by the coil to the other side of the transformer to achieve voltage conversion.

2. Energy storage: The iron core has a certain degree of magnetism and can store part of the magnetic field energy, which helps to reduce the energy loss of the transformer.

3. Structural support: The iron core is one of the main structural components of the transformer. It carries the coil and other components to ensure the stable operation of the transformer.

The iron core of an oil-immersed transformer is usually made of stacked silicon steel sheets, which have good electrical conductivity and magnetism and can effectively reduce the iron loss of the transformer. At the same time, the design of the iron core also fully considers the heat dissipation problem to ensure the stable operation of the transformer in a high temperature environment.

In order to keep the core working properly, it needs to be maintained regularly, including:

‌Check the windings: Regularly check whether the windings of the core are damaged or aged, and replace them in time.

‌Check the insulation layer: Check whether the insulation layer is aged or damaged, and replace it in time.

‌Clean the oil stains: Regularly clean the oil stains on the surface of the core to ensure its normal operation.

The influence of oil-immersed transformer core on transformer performance

The performance of oil-immersed transformer core has an important influence on the overall performance of the transformer. Specifically, the performance of the core directly affects the efficiency, temperature rise, noise and stability of the transformer.

Efficiency: The magnetic conductivity and loss performance of the core directly affect the efficiency of the transformer. High magnetic conductivity and low loss core can reduce energy loss and improve the efficiency of the transformer.

Temperature rise: The iron core will generate a certain amount of heat during operation, causing the temperature of the transformer to rise. The heat dissipation performance and thermal stability of the iron core have an important influence on the temperature rise of the transformer. Good heat dissipation performance and thermal stability help reduce the temperature rise of the transformer and extend its service life.

Noise: The vibration and magnetostrictive effect of the iron core will generate noise. Optimizing the structure and material selection of the iron core can reduce the noise level and improve the operating comfort of the transformer.

Stability: The structural stability and reliability of the iron core are crucial to the stable operation of the transformer. Good core design and manufacturing process can ensure the stable operation of the transformer in harsh environments.