Medium-voltage high-frequency transformer applied to power electronic transformer

Abstract

The invention discloses a medium-voltage high-frequency transformer applied to a power electronic transformer. The transformer comprises a high-voltage winding, a low-voltage winding and an iron core,wherein the low-voltage winding and the iron core are mutually insulated, the low-voltage winding is uniformly wound on the iron core, the low-voltage winding and the iron core are integrally coatedwith a semi-conductive material to form a shielding layer, the shielding layer is grounded, the low-voltage winding and the iron core are poured by using an epoxy resin or other heat-conducting insulating potting materials to form a pouring body, the high-voltage winding is uniformly wound on the pouring body, and the high-voltage winding, the low-voltage winding and the iron core are integrally poured by using an epoxy resin or other heat-conducting insulating potting materials. The medium-voltage high-frequency transformer is applied to power electronic transformers, and the problem that transformers in the prior art cannot meet the requirements for voltage resistance and partial discharge is solved.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a medium-voltage high-frequency transformer applied to power electronic transformers. Background technique [0002] Traditional transformers have disadvantages such as large volume and weight, high no-load loss, easy waveform distortion, and inability to isolate faults. With the rapid development of emerging grid technologies such as smart grids and energy routing, traditional transformers can no longer meet the needs of building a strong smart grid in my country. As a new type of power distribution equipment, power electronic transformers can overcome the shortcomings of traditional transformers, and realize multiple functions such as voltage transformation, electrical isolation, power regulation and control, and meet the needs of building smart grids. [0003] Power electronic transformers usually adopt a modular cascaded topology, so the modules located near the end of the medium-...

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Problems solved by technology

[0003] Power electronic transformers usually adopt a modular cascaded topology, so the modules located near the end of the medium-voltage grid have high potential. Insulation performance, and currently there is no high-voltage high-frequency transformer

[0004] In addition, since the high-voltage side of the power electronic transformer is not electrically connected to the iron core of the high-frequency transformer, a floating potential will be generated, which will cause partial discharge, and in severe cases, it will cause damage to the insulating medium and endanger the safety of personnel and equipment.

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