High-overload transformer

Abstract

The invention relates to a high-overload transformer. In order to solve the problems of high material consumption, poor heat dissipation effect and the like of a high-overload transformer which is frequently used in domestic, the high-overload transformer which is low in loss and good in heat dissipation is provided. The high-overload transformer comprises an iron core, a high-voltage winding, a low-voltage winding and an oil tank, wherein a low-voltage coil is wound around one side of the iron core, a high-voltage winding is wound around the other side of the iron core, the iron core, the low-voltage coil and the high-voltage coil are arranged in the oil box, the iron core is of an oval structure formed by laminating high-magnetic conduction silicon steel or amorphous alloy, the magnetic flux density of the iron core is smaller than 1.68T, the low-voltage winding employs a paper covered rectangular wire, the current density of the low-voltage winding is smaller than 3.5A / mm<2>, the high-voltage winding is of an oval multi-layer cylindrical structure, and a heat dissipation structure of the oil tank is a partition plate heat dissipation structure.

Description

technical field [0001] The invention relates to the field of high overload transformers, in particular to a high overload transformer with small loss and good heat dissipation. Background technique [0002] At present, although my country's rural distribution transformers are in light-load operation for most of the year, the load is mainly lighting electricity, the load is small, and the annual average load rate is also low, but in seasons, high temperatures, busy periods, etc., The rural electricity load has increased sharply, reaching 1.5 times to 2 times the load. During this period, the distribution transformers are seriously overloaded for a short period of time, resulting in frequent occurrence of serious accidents such as power outages and distribution transformer burnouts, which seriously affect the power supply. [0003] The methods to solve the problem of overload operation of distribution transformers include: simply increasing the capacity of distribution transfor...

AI Technical Summary

Problems solved by technology

[0002] At present, although my country's rural distribution transformers are in light-load operation for most of the year, the load is mainly lighting electricity, the load is small, and the annual average load rate is also low, but in seasons, high temperatures, busy periods, etc., Rural electricity load has increased sharply, reaching 1.5 times to 2 times the load. During this period, distribution transformers are seriously overloaded for a short period of time, resulting in frequent occurrence of serious accidents such as power outages and distribution transformer burnouts, seriously affecting power supply.

[0003] The methods to solve the problem of overload operation of distribution transformers include: simply increasing the capacity of distribution transformers is the simplest one, but this method will not only greatly increase the investment cost of the power grid, but also increase the no-load of distribution transformers. loss, so that the operating efficiency of the power grid is significantly reduced; although the use of adjustable capacity transformers can reduce the overall operating loss, but the substantial increase in investment costs is a flaw; , is an ideal solution to this challenge cost-effectively

However, the high overload transformers commonly used in China mainly have disadvantages such as high material consumption, poor heat dissipation effect, and large deviation in temperature rise calculation.

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