Outdoor totally-enclosed composite insulation single-phase combined transformer

Abstract

The invention discloses an outdoor totally-enclosed composite insulation single-phase combined transformer, which comprises a transformer body, embedded nuts, a packaging shell arranged outside the transformer body, a silicone rubber jacket injected outside the packaging shell, line banks and a junction box. The packaging shell consists of a large elliptic cylinder at the lower part and a small elliptic cylinder at the upper part, and the large elliptic cylinder and the small elliptic cylinder are integrated into a whole through the silicon rubber jacket injected outside the packaging shell. Acylindrical boss is arranged on the silicon rubber jacket at the top of the small elliptic cylinder, and the symmetrically distributed line banks are arranged on the cylindrical boss. The combined transformer is compact in structure, excellent in layout, accurate in metering and stable and reliable in performance. The outdoor complex operation environment is fully considered. The current part canachieve three transformation ratios, and the voltage part can achieve voltage conversion from 15 kV to 20 kV according to different requirements of users. Moreover, the installation is convenient, pollution flashover resistance is achieved, maintenance is avoided, the self-cleaning performance is high, electricity larceny prevention is reliable, and the operation life is long.

Description

technical field [0001] The invention relates to a transformer, in particular to a 15-20kV outdoor fully enclosed composite insulated single-phase combined transformer. Background technique [0002] At present, the domestic production of 15-20kV single-phase combined transformers is not mature enough, and it is difficult to adapt to the use in areas above 3000 meters above sea level. The anti-interference ability is poor, resulting in low mechanical strength of the product; secondly, because the current and voltage error precision in the combined transformer affects each other, the distance between the high-voltage terminal and the ground is limited, and the secondary terminal is prone to water seepage, which is not conducive to complex and changeable outdoor operation surroundings. [0003] However, foreign power systems are more concentrated in the rated voltage of 15-20kV. Transformers with such voltage levels are traded in a large volume in Asia, Africa, Latin America, a...

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Problems solved by technology

[0002] At present, the domestic production of 15-20kV single-phase combined transformers is not mature enough, and it is difficult to adapt to the use in areas above 3000 meters above sea level. The anti-interference ability is poor, resulting in low mechanical strength of the product; secondly, because the current and voltage error precision in the combined transformer affects each other, the distance between the high-voltage terminal and the ground is limited, and the secondary terminal is prone to water seepage, which is not conducive to complex and changeable outdoor operation surroundings

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