High impedance shell type transformer

Abstract

The invention discloses a high impedance shell type transformer. When the shell type transformer is a single-phase transformer, at least one magnetic flux leakage air channel gap iron core is arranged in a magnetic flux leakage air channel between a core column and a yoke of an iron core of the single-phase transformer. When the shell type transformer is a multi-phase transformer, at least one magnetic flux leakage air channel gap iron core is arranged in a magnetic flux leakage air channel between a core column and a yoke of an iron core of each phase in the single-phase transformer. Each magnetic flux leakage air channel gap iron core is composed of at least one magnetic conduction material and at least one gap base plate, the magnetic conduction materials and the gap base plates are arranged alternately, and the gap base plates are located between the magnetic conduction materials or between the magnetic conduction materials and the core columns or between the magnetic conduction materials and the yokes. Due to the fact that the magnetic flux leakage air channel gap iron cores composed of the magnetic conduction materials and the gap base plates are arranged in a magnetic flux leakage air channel of the shell type transformer, the high impedance shell type transformer achieves improvement of transformer impedance through increase of tiny materials.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a high-impedance shell-type transformer. Background technique [0002] With the development of my country's electric power industry, product reliability is becoming more and more important. High-impedance transformers are widely used because they can effectively reduce the short-circuit current of the system and improve the short-circuit capability. The static var compensation and filtering device adopts a thyristor-controlled high-impedance transformer, and the impedance of the transformer is as high as 33% to 100%. [0003] At present, the commonly used methods for high impedance transformers to achieve high impedance are: a. Increase the number of turns; b. Increase the magnetic flux leakage area (mainly increase the width of the main magnetic flux leakage channel); c. Increase the width of the winding to reduce the reactance height Wait. These methods are often realiz...

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Problems solved by technology

These methods are often achieved by greatly increasing the amount of materials used, which greatly increases the cost of improving impedance

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