It is undeniable that at present, the manufacturing quality and technical level of China's high-voltage transformers can not fully meet the needs of continuous development of the power system. Compared with the products of well-known transformers in foreign countries, there is still a certain gap. To meet the needs of users as soon as possible and to surpass the world's leading advanced level, it is expected that the recent development of China's high voltage transformers will have the following aspects.

    (1) Toward a higher level of voltage, the UHV power grid that will be present in China in the near future will be 1000KV, and therefore high-voltage transformers should naturally expand to new high voltage levels.

    (2) With the progress of the nationwide power system networking, the capacity of the power grid will increase with the development of the situation, requiring current transformers to develop in the direction of higher number of turns. For example, the rated current of 220 ~ 500KV products will exceed 50A. The thermal stable current will reach 63kA (3s) or more, and the dynamic steady current will reach 160KA or more.

    (3) sF6 transformers will be more widely used. The selection of urban power grid equipment in China focuses on miniaturization, non-oil-free, maintenance-free or less maintenance, while S, high-voltage transformers are explosion-proof, flame-retardant, small in size and light in weight. Easy to manufacture, convenient to maintain, etc., so there will be a broad market. However, product quality needs to be improved in order to meet user needs.

    (4) Dry-type transformers, due to their advantages, will continue to expand into higher voltage areas. Currently, the highest voltage rating of composite insulated dry-capacitor type pillar-type current transformers and bushing-type current transformers reaches 110KV. Dry voltage transformers with higher voltage levels appear. The developm

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