A 220kV Three-dimensional Wound Core Power Transformer and Core Manufacturing Method

Abstract

The invention discloses a 220kV three-dimensional wound core power transformer and a method for manufacturing an iron core. It includes an oil tank and an iron core assembly arranged in the oil tank. The iron core assembly includes three double-frame iron cores arranged in an equilateral triangle, and each two The vertical frames of the double-frame iron core are joined together to form a core column, and windings are arranged on the vertical outer periphery of the iron core column; the double-frame iron core includes an inner frame iron core and an outer frame iron core, and the inner frame iron core and the outer frame iron core A first oil passage is provided, and a second oil passage is provided between every two assembled inner frame cores, and every two assembled inner frame iron cores are connected with two assembled inner frame iron cores outside the inner frame iron cores. Vertical oil holes are arranged between the iron cores of the outer frame. The invention provides a 220kV three-dimensional wound core power transformer and a manufacturing method for the iron core. The three-dimensional wound core power transformer has low no-load loss, small no-load current, low noise and strong short-circuit resistance.

Description

technical field [0001] The invention relates to a 220kV three-dimensional wound iron core power transformer and an iron core manufacturing method, belonging to the technical field of power transformers. Background technique [0002] At present, power transformers are the most commonly used power equipment. The power industry has higher and higher requirements for power transformers. The country also prohibits transformers that do not meet the energy efficiency standards from being connected to the power grid. At present, the newly purchased transformers in the power industry should be high-efficiency energy-saving transformers. . Traditional laminated core transformers, especially high-voltage and large-capacity power transformers, are usually improved by replacing the core material, that is, using high-performance silicon steel sheets as the core manufacturing material, but the cost of the transformer core material will be greatly increased. [0003] If this type of transf...

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Problems solved by technology

[0005] The three-dimensional wound core is usually wound continuously with several strips. Due to the mechanical stress generated by mechanical processing such as strip stretching and winding, the performance of the silicon steel strip is destroyed. Therefore, the wound core must be processed by high temperature annealing process. Stress relief, the commonly used oil duct buckle and related insulating materials cannot withstand the high temperature of annealing, and the high temperature resistant material is usually not tough enough, and the high temperature resistant material is easily broken during winding, so the laminated core heat dissipation structure cannot be applied to the coiled core

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