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Self-circulating three-winding autotransformer and manufacturing method thereof

A technology of autotransformer and manufacturing method, which is applied in the direction of inductance/transformer/magnet manufacturing, transformers, fixed transformers, etc., can solve the problems of complex overvoltage protection, poor heat dissipation conditions of dry-type transformers, and small loss, and achieve improved volume resistance High efficiency, excellent solid heat transfer efficiency, poor functional stability

Inactive Publication Date: 2020-11-17
平顶山市恒锐电气制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although with the development of the power system, the improvement of the voltage level and the increase of the transmission capacity, the autotransformer has been widely used due to its large capacity, small loss and low cost, but it still has many insurmountable limitations: 1. , Due to the poor heat dissipation conditions of dry-type transformers, the capacity cannot be enlarged
2. Increase the short-circuit current of the power system
And because the neutral point of the autotransformer must be directly grounded, the single-phase short-circuit current of the system will be greatly increased, sometimes even exceeding the three-phase short-circuit current
3. Complicate the overvoltage protection of the winding
[0005] At present, in the relevant patents that have been applied for in China, there is no prior art on the three-winding autotransformer, so the market needs a low loss, high conversion efficiency, good electromagnetic shielding, good insulation, high cost performance, and long service life. long autotransformer

Method used

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  • Self-circulating three-winding autotransformer and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 A self-circulating three-winding autotransformer is shown, including a skeleton, a winding 5, a magnetic core 4, a shield 1, and a packaging material, wherein the skeleton is an alumina-based porous foam ceramic skeleton 3 with a porosity of 20%-30% ; Winding 5 adopts copper wire with 1140 epoxy polyester insulating varnish; Magnetic core 4 is a Japanese-shaped silicon steel sheet magnetic core 4; The gap between shielding cover 1 and other components is filled with self-circulating insulating heat transfer filler 2, said The self-circulating insulating heat transfer filler 2 is a mixture of alumina-based porous foam ceramics, non-vulcanized silica gel and gum rosin; the shielding cover 1 is made of aluminum alloy and is packaged in a fully enclosed structure.

[0041] The manufacturing method of the three-winding autotransformer comprises the following steps:

[0042] 1) Selection and preparation of various components

[0043] ① The skeleton is made ...

Embodiment 2

[0070] The whole is consistent with Example 1, the difference is:

[0071] The manufacturing method of the three-winding autotransformer comprises the following steps:

[0072] 2) Manufacturing method of self-circulating insulating heat transfer filler 2

[0073] ① Mix aluminum chloride hexahydrate with an appropriate amount of pure water, stir and filter impurities, adjust to obtain an aluminum chloride solution with a mass percentage of 65%, and add sodium silicate with a weight of 55% aluminum chloride hexahydrate into the aluminum chloride solution , stir until dissolved evenly;

[0074] ③ After step ② is completed, continue to vibrate at high frequency for 40 minutes, then place the obtained solution in a constant temperature environment of 30°C, and stir it mechanically for 40 minutes to obtain a prefabricated solution;

[0075] ④ Slowly add dilute hydrochloric acid solution dropwise to the prefabricated solution obtained in step ③ and stir until the pH value of the so...

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Abstract

The invention discloses a high-stability high-reliability self-circulating three-winding autotransformer and a manufacturing method thereof. The three-winding autotransformer comprises a framework, windings, a magnetic core, a shielding cover and a packaging material and is characterized in that the framework is an alumina-based porous foamed ceramic framework with the porosity of 20-30%; the windings adopt red copper wires with 1140 epoxy polyester insulating varnish; the magnetic core is a B-shaped silicon steel sheet magnetic core; gaps between the shielding cover and other parts are filledwith self-circulating insulating heat transfer filler, and the self-circulating insulating heat transfer filler is a mixture of alumina-based porous foamed ceramic, non-vulcanized silica gel and gumrosin; the shielding cover is made of aluminum alloy and packaged by a full-closed structure. The autotransformer has the advantages of small loss, high conversion efficiency, good electromagnetic shielding performance, good insulation, high cost performance and long service life.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a self-circulating three-winding autotransformer and a manufacturing method thereof. Background technique [0002] Autotransformer: A multi-stage special transformer that does not require insulation, that is, a special transformer that shares a set of coils for output and input. In other words, a transformer with multiple stages on the same winding. Auto-coupling means electromagnetic coupling. Ordinary transformers transmit energy through the electromagnetic coupling of the primary and secondary coils. There is no direct electrical connection between the primary and secondary sides. The primary and secondary sides of the autotransformer have direct electrical connections. Its low-voltage coils It is part of the high voltage coil. [0003] In the power grid, there are autotransformers from the voltage level of 220KV, which are mostly used as connection transformers between ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F30/02H01F41/00
CPCH01F30/02H01F41/00
Inventor 郭思源孙静
Owner 平顶山市恒锐电气制造有限公司
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