Novel dry type transformer

Abstract

The invention discloses a novel dry type transformer. A high-voltage coil is of a pagoda type structure formed by winding a copper wire in a vertical winding mode; the high-voltage coil, a high-voltage bushing and a low-voltage bushing are cast into a whole, and a high-voltage wire package is formed; semiconductor conductive paint is sprayed on the outer surface of the high-voltage wire package, and the outer surface of the high-voltage wire package is enabled to form a zero potential; the distances between the two tail ends of the semiconductor conductive paint and the root parts of the high-voltage bushing and the low-voltage bushing are 5-20 mm; a central conductor in the high-voltage bushing is connected with a high-voltage lead of the high-voltage coil; a shielding electrode in the high-voltage bushing is connected with the semiconductor conductive paint on the outer surface of the high-voltage coil; a low-voltage lead of the high-voltage coil is connected with a central conductorin the low-voltage bushing; and a low-voltage coil is arranged on an iron core in a sleeving mode. The transformer is small in size, light in weight, small in no-load loss and higher in voltage gradeand capacity.

Description

[0001] Technical field: [0002] The invention relates to a new type of dry-type transformer. [0003] Background technique: [0004] In the field of transformer manufacturing, it is generally divided into oil-immersed transformers and dry-type transformers, and epoxy-cast dry-type transformers are mostly used for voltage levels of 40.5kV and below. Compared with air and transformer oil, epoxy resin has higher insulation strength, and after casting, it has higher mechanical strength and superior moisture and dust resistance. Compared with oil-immersed transformers, it has energy saving, no oil and easy maintenance. Advantages, so epoxy resin dry-type transformers are more and more popular with users. [0005] At present, epoxy resin dry-type transformers (such as figure 1 The line package structure shown) mainly includes low-voltage line package and high-voltage line package. The high-voltage line package mostly adopts transverse winding method. The high-voltage lead wire is drawn fro...

AI Technical Summary

Problems solved by technology

[0005] At present, epoxy resin dry-type transformers (such as figure 1 (shown) mainly includes a low-voltage wire package and a high-voltage wire package. The high-voltage wire package mostly adopts a horizontal winding method, and the high-voltage lead wire is drawn from the middle of the outer surface of the coil, so that the outer surface of the high-voltage wire package is at a high potential. The outer surface of the high-voltage wire package Flashover discharge is easy to occur on the surface and the upper and lower ends. At the same time, there will always be a certain insulation distance H1 and H2 between the high-voltage wire package and between the high-voltage wire package and the iron core, which increases the size of the iron core and the volume of the transformer. get bigger

Due to the limitations of application occasions and technical conditions, the current epoxy cast dry-type transformer with this structure can only achieve a voltage level of 40.5kV, and transformers with higher voltage levels are mainly oil-immersed.

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