Transformer with grade-insulation structure

Abstract

The invention discloses a transformer with a grade-insulation structure, and the transformer comprise a low-voltage coil, a high-voltage coil, a shielding electrode, a grade-insulation structure and an iron core, wherein the low-voltage coil and the high-voltage coil are respectively arranged at the inner side and outer side of the grade-insulation structure, the iron core arranged at the inner side of the low-voltage coil is provided with a radiating folding screen, and a shield is arranged at the outlet electrode of the high-voltage coil to form the shielding electrode; and the grade-insulation structure comprises a first insulation layer, a second insulation layer, a third insulation layer, an angle ring, a fourth insulation layer, a fifth insulation layer and a sixth insulation layer which are arranged from inside to outside, and the angle ring stretches out of the low-voltage coil and the high-voltage coil. The transformer with the grade-insulation structure has the advantages that the material cost and energy consumption of the transformer are greatly reduced, the reliability of the product is improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of transformer manufacturing, and in particular relates to a transformer with a step-by-step insulation structure suitable for the electromagnetic structure of small and medium distribution transformers. Background technique [0002] Such as figure 1 and 2 As shown, in the design and manufacture of small and medium-sized distribution transformers, a single insulation structure is adopted. Common structure: Use grade A insulating cardboard to process it into a corrugated oil channel or a stay curtain, and then wrap several insulating cardboards on the basis of this oil channel. In addition to the great advantages of the oil flow channel, this traditional structure has several major disadvantages: [0003] 1. The problem of excessive insulation space [0004] ① Corrugated oil channel or stay curtain structure, for 10KV class transformers, the insulation distance is usually selected as 6-9 mm, and some companies with...

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Problems solved by technology

[0013] The purpose of the present invention is to provide a transformer with a step-by-step insulation structure, which solves the four major problems of existing transformers: high cost, high energy consumption, fast insulation aging, hot spots, and partial discharge. Effective improvement of defects to meet people's further needs

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