DC isolation transformer with same-iron-core expandable structure

Abstract

The invention discloses a DC isolation transformer with a same-iron-core expandable structure. The DC isolation transformer is composed of a number of sub transformers connected in a cascade form. Each sub transformer includes an iron core assembly, an input side winding and an output side winding. Each iron core assembly consists of a first iron core column and a second iron core column. Each input side winding includes an input side inner winding, an input side insulating support and an input side outer winding casing which sleeve the corresponding first iron core column in sequence, and theinput side outer winding casing contains an input side outer winding. Each output side winding includes an output side inner winding, an output side insulating support and an output side outer winding casing which sleeve the corresponding second iron core column in sequence, and the output side outer winding casing contains an output side outer winding. The two ends of the input side inner windings and the two ends of the output side inner windings are connected respectively to form an energy transmission loop. By adopting the sub transformers with the same iron core, double insulation and isolation capability can be realized under the same core. Moreover, the sub transformers can be expanded by cascading to achieve insulation and isolation at a higher voltage level.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a direct current isolation transformer with an expandable structure of the same iron core. Background technique [0002] HVDC circuit breaker is the core equipment to realize short-circuit current breaking and fault isolation of flexible DC transmission system, and it is also a key contact node of high-voltage and large-capacity DC power grid. [0003] At present, DC circuit breakers with engineering application significance generally use a hybrid technology route combining power electronic switches and mechanical switches, collectively referred to as hybrid DC circuit breakers. The hybrid DC circuit breaker includes a large number of semiconductor cascaded components and multiple sets of mechanical switch modules. These components need to be supplied with external power to work, but the special operating conditions of the DC circuit breaker make ...

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the technical problem that the dry-type isolation transformer in the prior art has poor insulation withstand voltage capability and is prone to partial discharge in high voltage levels, thereby providing an expandable structure with the same iron core DC isolation transformer

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