Small-capacity epoxy resin poured dry type transformer

Abstract

The invention discloses a small-capacity epoxy resin poured dry type transformer, belonging to the technical field of dry type transformers. The small-capacity epoxy resin poured dry type transformer comprises an iron core, a low-voltage coil, a high-voltage coil, an upper clamp piece, a lower clamp piece, an upper cushion block, a lower cushion block and a pull screw rod, wherein a ventilation air duct is arranged between the low-voltage coil and the high-voltage coil, the upper and lower cushion blocks are arranged on the upper and lower ends of the ventilation air duct, the upper cushion block is provided with the upper clamp piece, the lower cushion block is provided with the lower clamp piece, the pull screw rod is connected between the upper clamp piece and the lower clamp piece, a lead-out wire of the low-voltage coil is connected onto a low-voltage lead insulator, a starting lead of the high-voltage coil is connected to a start terminal, a tapping lead of the high-voltage coil is connected to a tapping terminal, and a tail lead of the high-voltage coil is connected onto a tail terminal. The small-capacity epoxy resin poured dry type transformer has the characteristics that a plurality of tapping joints of the tapping terminal are arranged in a equilateral polygon shape, and resin partitions are respectively arranged between the tapping terminal and the starting terminal and between the tapping terminal and the tail terminal. The small-capacity epoxy resin poured dry type transformer has the advantages of improving the safety use performance, prolonging the insulation distance among all tapping points, and improving the electric insulation strength, and is small in size and compact and reasonable in structure.

Description

technical field [0001] The invention belongs to the technical field of dry-type transformers, in particular to a small-capacity epoxy resin casting dry-type transformer. Background technique [0002] Transformers are generally divided into oil-immersed transformers and dry-type transformers. Dry-type transformers mainly include three types: open type, closed type and pouring type. The pouring type usually uses epoxy resin as the insulating medium and heat dissipation medium, and the wound coil is used Resin casting. Compared with air and transformer oil, epoxy resin has higher dielectric strength, and after casting, it has higher mechanical strength and superior moisture-proof and dust-proof performance, and it is energy-saving, oil-free and maintenance-free compared with oil-immersed transformers. Convenience and other advantages, so dry-type transformers are becoming more and more popular among users. [0003] In the prior art, regardless of large capacity or small capac...

AI Technical Summary

Problems solved by technology

The problem caused by this is that, for dry-type transformers with small capacity, especially small capacity, due to the limitation of product size design and existing process technology, the insulation process and insulation structure are more complicated, and the creepage distance on the high-voltage side becomes shorter, which may cause Arc discharge due to insufficient safety distance, resulting in single-phase grounding or multi-phase short circuit, until tripping

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