Air-cooled Transformer's improved engine fuel supply method has been used in many domestic 200MW units in southern my country. What are the pre-operation inspections and precautions for the Air-cooled Transformer?

The oil-immersed transformer is widely used equipment for power transmission and transformation in the power grid. Its price is expensive and its reliability directly determines the normal operation of the power grid. The heating of the Oil-immersed transformer during operation is an important reason for the gradual aging of its insulation system. From the perspective of power equipment renewal, the increase in the service time of the transformer will greatly reduce the cost of funds. The winding coil and iron core are the heat sources, while the transformer’s excessive internal temperature leads to a loss of the service life of the transformer. The transformer oil-paper insulation system is most affected by temperature changes, and the transformer hot-spot temperature reaches above the limit value. The deterioration of the insulation paper may lead to the failure of the insulation system.

The iron core of the Dry-type transformer is a stepped 45° fully oblique seam. Inter-turn, inter-layer, inter-segment insulation, and insulation cylinders are all composed of insulating paper or molded parts. The low-voltage coil is a foil type, and the high-voltage coil is a continuous type. The Dry-type transformer body adopts special measures to block and reduce noise.

In production and life, transformers have brought many important influences on production and life. The protection instructions of liquid-immersed transformers and the knowledge of protection devices can better extend the service life of transformers.

Liquid-immersed Transformer has the characteristics of good heat dissipation, low loss, large capacity, and low cost. It has become the most widely used power transformer in the power grid. Its reliability is directly related to the safety and stability of the power grid. The Liquid-immersed Transformer adopts a solid-liquid composite insulation structure. At present, a conventional oil-paper insulation system consisting of cellulose insulating paper and mineral insulating oil is often used. The safety and reliability of the insulation system is the basic condition for the normal operation of the transformer. During the long-term operation of the oil-immersed transformer, the insulation system is gradually aging due to the influence of temperature, oxygen, moisture, and other factors.