Characteristics Of Power Transformers And Distribution Transformers

At present, representative products that have been operating in the system include: 1150KV, 1200MV · A, 735-765KV, 800MV · A, 400-500KV, 3-phase 750MV · A or single-phase 550MV · A, 220KV, 3-phase 1300MV · A power transformers; DC transmission ± 500KV, 400MV · A converter transformer. Power transformers are mainly oil immersed, with two types of product structures: core type and shell type. Core production accounts for 95%, while shell production only accounts for 5%. The core type and shell type have no overwhelming advantage over each other, but the core type process is relatively simple, which is why it is adopted by most enterprises; The shell structure and process are both more complex, and only traditional factories adopt them. Shell type is particularly suitable for high voltage and large capacity, with advantages in insulation, mechanical and heat dissipation, and is suitable for transportation of hydropower stations in mountainous areas.
distribution transformer
The capacity of foreign distribution transformers can reach 2500KV · A, with circular and elliptical iron core forms. The majority of them are circular, while the elliptical ones can be reduced in material usage due to the small spacing between M0 (iron core columns), and their corresponding coils are elliptical. Low voltage coils are wired wound and foil type, and the fuel tank has (a few) and corrugated type (most) with heat dissipation pipes.