Dry-type grounding transformer with adjustable zero-sequence impedance

Abstract

The invention belongs to the technical field of transformers, and particularly relates to a dry-type grounding transformer with adjustable zero-sequence impedance. The dry-type grounding transformer comprises an iron core, wherein the iron core comprises two E-shaped structures, a plurality of iron core cakes and a plurality of air gap structures, the two E-shaped structures are oppositely arranged, the iron core cakes and the air gap structures form three identical air gap structure-iron core cake composites according to the arrangement mode of the air gap structure, the iron core cake, the air gap structure, the iron core cake,... and the air gap structure, and the air gap structure-iron core cake composites are connected between the corresponding branches of the two E-shaped structures respectively. According to the invention, firstly, the thickness of the iron core cake and the thickness of the air gap structure can be adjusted in the design stage, and then adjustment of zero-sequence impedance is achieved; and secondly, the connection mode of tapping sheets is adjusted according to different use conditions during use, so that the number of turns of the coil is adjusted, and the zero-sequence impedance is adjusted in the use process.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a dry-type grounding transformer with adjustable zero-sequence impedance. Background technique [0002] At present, the known dry-type grounding transformer has a fixed zero-sequence impedance value after production, which cannot be adjusted, and generally the zero-sequence impedance has a specific required value. In order to meet the requirements of the zero-sequence impedance value, it is necessary to continuously adjust the coil turns Parameters such as number, core parameters, and coil height also bring a lot of inconvenience to the design work. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a dry-type grounding transformer with adjustable zero-sequence impedance, which is simple in design and cost-saving, and the zero-sequence impedance value can be adjusted according to system requirements...

AI Technical Summary

Problems solved by technology

[0002] At present, the known dry-type grounding transformer has a fixed zero-sequence impedance value after production, which cannot be adjusted, and generally the zero-sequence impedance has a specific required value. In order to meet the requirements of the zero-sequence impedance value, it is necessary to continuously adjust the coil turns The number, core parameters, coil height and other parameters also bring a lot of inconvenience to the design work

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