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Features of dry-type transformers

| 发布时间:2019-12-18 | 浏览数:载入中... Source: http://shihaojs.com/ | Release time: 2019-12-18 | Views: Loading ...


Everyone has their own characteristics, because each person's characteristics are different, which creates the charm of each person's personality. The machine is also the same. This article Shanghai Huanniu will introduce the characteristics of dry-type transformers .

1 Impact resistance

The high-voltage winding of the wire-wound casting transformer adopts a special segmented cylindrical structure. This structure is developed based on the ordinary segmented cylindrical winding. The ordinary segmented cylinder inherits the advantages of the shock resistance of the cylindrical winding. It also solves the contradiction of the high voltage between the layers of the cylindrical winding. It is an ideal winding structure, which is often called a non-resonant winding structure.

Compared with the ordinary segmented cylinder type, the special segmented cylinder type further reduces the interlayer voltage, improves the voltage distribution, and greatly improves the impact strength against atmospheric overvoltage and operating overvoltage.


The impact resistance is not only related to the structure of the winding, but also depends on the casting quality of the winding and the electrical properties of the insulating material.

After the winding of this product is completed, it is cast with pure resin under vacuum, and no filler is added, so that the resin's flowability is not reduced.

Because the winding is made of wire, the resin can completely penetrate the winding regardless of the axial direction or radial direction of the winding, and there is no air bubble inside.

Abstract: This article introduces the classification and characteristics of dry-type transformers, and focuses on the structural characteristics, technical characteristics, cooling systems, temperature control systems, etc. of wire-wound casting transformers, and summarizes the development of dry-type transformers. prospect.

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2. Good mechanical strength

Strong short-circuit resistance. For wire-wound segmented cylinders, after vacuum casting, the resin can be impregnated with resin at one time regardless of the layers, turns, and sections of the winding.

After curing, the resin, wire and glass fiber are tightly combined to form a rigid rigid body structure. The high-strength mechanical properties of this structure determine that wire-wound castable products have good short-circuit resistance.

3.Good crack resistance

The composite insulation material formed by resin and glass fiber curing has a thermal expansion coefficient of (18-20) × 10-6 / K and a copper expansion coefficient of 17 × 10-6 / K. The two are basically close to each other. The mechanical stress between the winding conductor and the insulation material due to thermal expansion and contraction during the operation of the transformer prevents cracks from the root cause.

4, moisture-proof

Because the product is cast with resin at both high and low pressure, and the iron core is also coated with resin, it has strong moisture and corrosion resistance. When the air relative humidity is 100%, it can still run for a long time.

5, good cooling effect

Because the composite insulation made of pure resin and glass fiber has extremely high electrical strength, the surface insulation thickness of this product is only 1.5 to 2 mm, which greatly improves the heat dissipation efficiency of the winding surface.



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