High-voltage isolation transformer with combined insulation structure

Abstract

The invention provides a high-voltage isolation transformer with a combined insulation structure and belongs to the technical field of isolation transformers. The high-voltage isolation transformer comprises a bottom plate, an insulating sleeve, a top plate and a grading ring; the insulating sleeve is coiled to form a cylinder with an internal mounting space; a transformer assembly is suitable forbeing arranged in the mounting space; and an insulating gas is suitable for being accommodated in the insulating sleeve. According to the high-voltage isolation transformer of the invention, a mode combining gas insulation and solid insulation is adopted, wherein the gas insulation is used as the main insulation for high-voltage isolation, and the gas insulation is used as auxiliary insulation for improving the surface insulation characteristic of the transformer. The high-voltage isolation transformer can be flexibly expanded to high-voltage isolation transformers with voltage classes of more than 35kV. Compared with a conventional dry-type transformer, the high-voltage isolation transformer of the invention has the advantages of higher insulating strength, low partial discharge suppression, low noise and high heat dissipation. The application of the isolation transformer under direct-current high voltages of 100KV or more can be realized; and the long-term reliable application of the isolation transformer under direct-current voltages or alternating-current voltages is realized.

Description

technical field [0001] The invention relates to the technical field of isolation transformers, in particular to a high-voltage isolation transformer with a combined insulation structure. Background technique [0002] High-voltage isolation transformer refers to the isolation of the respective currents between the coils of the primary side (primary side) and the secondary side (secondary side) through certain insulation measures, so that the input winding and the output winding are electrically separated. transformer. [0003] With the development of DC transmission design, some new devices have appeared in the DC system, such as DC circuit breakers. These devices are passive devices and require external energy supply, so there is a demand for isolation transformers. Since passive power equipment cannot obtain energy online through high potential, it is necessary to obtain energy from the power system of the low-voltage station through a high-voltage isolation transformer an...

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Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the isolation transformer in the prior art cannot be applied to a level above h...

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