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Dry-type transformers rely on air convection for natural cooling, or increase fan cooling, and are mostly used in high-rise buildings, high-speed toll station electricity, and local lighting, electronic circuits and other small-capacity transformers. Long-term overload operation of the transformer will cause the coil to heat, gradually aging the insulation, resulting in short circuit between the turns, phase short circuit or short- circuit to the ground and the decomposition of the oil; core insulation aging or damage to the clamp bolt casing, will make the iron core greatly The eddy currents cause long-term heating of the iron core resulting in insulation aging; when the transformer is overhauled, care should be taken to protect the coils or bushings. If scratches are found, they should be dealt with promptly. With the rapid and healthy development of China’s economy, the demand for electricity continues to grow rapidly, which has led to the development of the dry-type transformer industry.

Dry-type transformers are transformers whose cores and windings are not impregnated with insulating oil. China has so far become the world’s largest producer and sales volume of dry-type transformers. At present, various high- and low-voltage electrical products in foreign countries occupy some important domestic markets, except that dry-type transformers have hardly been imported from abroad after the end of the 20th century. In key domestic projects and major projects, it is difficult to see foreign dry products. Transformer traces. With the improvement of environmental protection requirements such as fire safety, degradation of waste materials after the end of transformer operating life, and the future trend of specific national environmental protection policies, dry-type transformers will take advantage of their environmental protection in the future market. Stronger competitive power in competition.

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