Three-dimensional coiled iron core type oil immersed transformer

Abstract

The invention relates to a three-dimensional coiled iron core type oil immersed transformer. The three-dimensional coiled iron core type oil immersed transformer comprises an oil tank; a heat dissipation apparatus is arranged on the outer side surface of the oil tank; an iron core is fixedly mounted in the oil tank; the iron core is formed by three same iron core frames in a combined and spliced manner; adjacent iron core columns of the two iron core frames are butt jointed mutually; the exterior of the two assembled iron core columns is wound with a coil; each iron core frame comprises an upper iron yoke and a lower iron yoke; two corresponding externally-extended iron core arms of the upper iron yoke and the lower iron yoke are butt jointed mutually to form the iron core columns; the upper iron yoke and the lower iron yoke are both formed by U-shaped material sheets in a laminating manner; two bending corners of 135 degrees or three bending corners of 150 degrees are arranged in eachbending position of the U-shaped material sheets; and an iron core framework is arranged outside the iron core and the coil. The iron core provided by the invention does not need annealing treatment,so that annealing cost is lowered, and stable performance is realized; the iron core can be locked tightly by the framework, so that noise in operation of the iron core can be lowered, and extremelylow no-load loss is realized; and in addition, the three-dimensional coiled iron core type oil immersed transformer is simple in structure and convenient to process.

Description

technical field [0001] The invention relates to the field of transformer manufacturing, in particular to a three-dimensional wound core type oil-immersed transformer. Background technique [0002] Transformer is a device that uses the principle of electromagnetic induction to change AC voltage. The main components are primary coil, secondary coil and iron core. According to the cooling method, it can be divided into: dry-type transformer and oil-immersed transformer, single-phase transformer, electric furnace transformer, rectifier transformer, etc. Transformer components include body, transformer oil, oil tank and cooling device, voltage regulating device, protection device and outlet bushing. The body is an important part of the transformer, including the core and windings. The iron core is the main magnetic circuit part of the transformer. It is usually made of stacked hot-rolled or cold-rolled silicon steel sheets with high silicon content and coated with insulating p...

AI Technical Summary

Problems solved by technology

However, due to the seamless structure of the wound iron core, special equipment is required for coil winding, which is difficult, complicated and low in production efficiency.

Moreover, the winding must be wound on the iron core, which increases the difficulty of winding winding, and because the low-voltage winding cannot be made into foil winding, its ability to withstand short circuit is reduced

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