Oil-immersed type transformer for tridimensional triangle iron core

Abstract

The invention relates to a tridimensional trigonal iron core oil-immersed type power transformer, which comprises an iron core, high-voltage sleeves (11), low-voltage sleeves (14), a grounding line (16), an oil level indicator (15), an exhauster (12), a tapping switch (17), and heat radiating fins (13). The iron core of the transformer has a tridimensional trigonal structure formed by combining and assembling three independent single-phase open rolled iron cores with same shapes in an angle of 120 degrees, the section area of each single-phase iron core yoke is (the formula) times larger than that of the core column of each single-phase iron core, and the sections of three columns of the tridimensional trigonal open iron core after assembling can be ellipses or polygons (circumcircles). Because of the open characteristic of the iron core, the coil can be winded singly during production, and the coil can be mounted or replaced by opening the iron core at an open slot position during production and maintaining.

Description

Technical field [0001] The invention relates to a three-dimensional triangular iron core oil-immersed transformer, the overall shape of which is a cylinder whose section is an equilateral triangle. Background technique [0002] Oil-immersed transformers are mainly composed of iron cores, coils and oil tanks. At present, the iron cores of traditional oil-immersed transformers in China generally use laminated iron cores. The laminated iron core is formed by stacking single-piece silicon steel strips of various specifications. Since there are many oblique seams at the junction of each layer when the iron core is stacked, the magnetic flux density at the junction changes too much. , will lead to a series of technical problems, resulting in the decline of technical performance indicators and the use of more silicon steel sheets. There are also a certain number of oil-immersed transformers whose core structure is a wound core. Winding core, also known as winding core, is made of...

AI Technical Summary

Problems solved by technology

The ideal structure of the three-dimensional triangular iron core is that the cross-sectional area of ​​the iron yoke of each single-phase iron core should be larger than the cross-sectional area of ​​the iron core column. times (about 16%), it is currently difficult to meet the requirements of this process installation

In addition, there are many problems in the seamless wound iron core, such as special manufacturing equipment, limited production capacity, complicated and cumbersome process, inconvenient maintenance, and inability to produce large-capacity oil-immersed transformers, etc.

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