C-class non-sealed coil dry transformer

Abstract

The invention relates to a C class non-envelop winding dry type transformer that comprises iron core, high voltage winding and low voltage winding. Its feature is that, the iron core is made up of silicon steel of grain orientation high magnetic diffusivity lab joint together five steps and 45 degree full juncture; the low voltage winding with high capacity is winded from copper foil and there is insulating material that can endure 220 degree centigrade is set between the layers; mica strip that can endure 500 degree centigrade constructs cooling air duct, and the whole winding would form a rigid body after dipping into vacuum pressure lacquer and high temperature solidifying; the high voltage winding is continuous structure and is construct by C class glass fiber covered wire, and there is mica strip that can endure 500 degree centigrade is set between the layers, the whole winding would form a rigid body after several times of dipping into vacuum pressure lacquer and high temperature solidifying. It is low power consumption and high efficiency.

Description

Technical field [0001] The invention relates to a transformer, in particular to a dry-type transformer. Background technique [0002] A Chinese patent once disclosed a "manufacturing process of flame-retardant paper three-phase dry-type transformer" (application number: 99124508.3, publication date: 2000.05.17), which is characterized in that the insulating material used for the internal low-voltage coil winding has an insulation grade of F After the transformer is wound, use a solvent-free impregnating varnish with an insulation class of F or above for vacuum pressure impregnation, and finally dry it, and install elastic silicone rubber parts to prevent vibration. A Chinese patent has also disclosed a "flame-retardant paper foil-wound three-phase dry-type transformer" (ZL99252900.X, announcement date: 2000.09.27), which has an iron core and three low-voltage foil-wound coils inside and an outside The high-voltage winding, low-voltage copper foil insulation layer and high-v...

AI Technical Summary

Problems solved by technology

In fact, the current domestic epoxy cast dry-type transformers can only achieve Class F (155°C), and are bulky, the insulation system is not flame-retardant, and the expiration of the service life is not conducive to decomposition and recycling.

The UL certification test also proves that the best epoxy resin in the world loses its mechanical strength above 200°C

Images