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The material performance is not less than 30ZH110 cold rolled silicon steel sheet; Three-phase three-column three-dimensional symmetrical structure has the most balanced three-phase magnetic circuit.

For an iron core, the core sheet is required to be flat, no waves, should be vertical after standing up, not skewed, the order is clear, the joint is tight, correct, the edge of the piece without short circuit, etc., in order to ensure the electromagnetic performance of the iron core.

The insulation resistance of power transformers in operation is qualified by: 10KV class and below, the insulation value is greater than 300 megohm: 35KV class, the insulation value is greater than 400 megohm (the ambient temperature is 20℃).

The types of transformers are varied, but as far as their working principle is concerned, they are made according to the principle of electromagnetic induction. In general, the classification of commonly used transformers can be classified as follows.

Vacuum oil injection can greatly reduce the content of transformer oil and water, thus greatly enhancing the breakdown strength of transformer oil, that is, reducing the oil gap distance of the body insulation, resulting in greatly reduced transformer design costs. 

The main function of insulating oil is insulation and heat dissipation, insulating oil first requires good insulation performance, that is, high breakdown voltage, small dielectric factor, which affects the breakdown voltage of the main factors are water, impurities, gas and so on.

With the development of the power industry, how to improve the performance of power equipment and ensure the reliable operation of the power system is an urgent problem that needs to be solved in power production.

There is no joint between the three dimensional coil core layers, the magnetic circuit is evenly distributed everywhere, there is no obvious high resistance area, and there is no distortion of the magnetic flux density at the joint.

Low loss silicon steel sheet, stepped laminated iron core joint, further introduction of foil winding structure, noise research, environmental protection requirements, new materials, new processes, new technology and computer optimization design, its development can make the future dry transformer more energy saving and quiet.

The oil of the oil-immersed transformer is very important for the operation of the transformer, and the oil-immersed transformer without the transformer oil will be meaningless.