A protective seat on the tap terminal of a dry-type transformer

Abstract

The invention discloses a protective base on the tapping terminal of a dry type transformer. The protective base comprises a ceramic base in the shape like a Chinese character ''hui'', wherein a flange is arranged at the lower end of the ceramic base, a plurality of grooves in the shapes like the Chinese character ''hui'' are formed in the bottom surface of the flange, seal rings are fixedly arranged inside the grooves of the ceramic base in an inserted connection manner, a plurality of groups of opposite positioning blocks are formed on the opposite inner walls of the ceramic base, and inserting grooves are formed in two side walls of each positioning block; a rectangular pipe sleeve is arranged between the opposite positioning blocks on two sides of the ceramic base, two ends of the pipesleeve are connected with a jacket in the shape like a Chinese character ''men'' in an inserted manner, and two ends of the jacket are connected into the inserting grooves of the positioning blocks in the inserted manner; a rectangular notch is formed in the upper end face of the pipe sleeve, a threaded hole is formed in the lower end of the pipe sleeve, a trapezoidal wedge block is connected into the rectangular notch of the pipe sleeve in the inserted manner, the jacket abuts against two side walls of the wedge block, the wedge block is connected with a bolt in the inserted manner, and thebolt passes through the wedge block to be in screw joint into the threaded hole of the pipe sleeve. According to the protective base, mounting and dismounting on a transformer shell are realized conveniently, the shape of the transformer shell and mold opening do not need to be changed, so that the cost is saved.

Description

Technical field: [0001] The invention relates to the technical field of transformers, in particular to a protective seat on a tap terminal of a dry-type transformer. Background technique: [0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Traditional transformers can be divided into oil-immersed transformers, fully sealed transformers, combined transformers and dry-type transformers. For the small-capacity, high-voltage casting transformers with tap terminals currently on the market, the high-voltage outlet terminals and high-voltage tap terminals are generally placed on both sides of the transformer coil. The safety distance of terminals and transformers is also required to be relatively large. [0003] When the performance of insulating materials is degraded, it is affected by external factors such as weather, such as high air humidity, successive cloudy and mildewy rainy seasons, and humid environments. The elec...

AI Technical Summary

Problems solved by technology

However, the distance between the high-voltage terminal and the high-voltage tap terminal along the surface of the object in the small-capacity high-voltage dry-type transformer with tap terminals in the prior art does not meet this minimum standard

Therefore, it is proposed to form a rectangular insulating wall outside the tap terminal of the dry-type transformer to increase the creepage distance, and form an abrupt insulating wall structure on the outer wall of the transformer shell, which requires the transformer shell to be molded again, which increases the manufacturing cost. Moreover, the previous transformer housing could not use this technology

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