Voltage transformer framework sprayed with semi-conductive paint

Abstract

The utility model discloses a voltage transformer framework sprayed with semi-conductive paint, which is characterized in that the framework is in a cylinder shape enclosed by epoxy glass cloth, two ends of the framework are processed into fillets (1), the inner surface and the outer surface of the framework are subjected to sand blasting treatment, then a semi-conductive paint surface (2) is sprayed, the sand blasting surface is subjected to surface roughening by adopting 12-mesh sand, and the volume resistance of the semi-conductive paint surface (2) is 5-15k omega / cm. According to the utility model, the mode of spraying the semi-conductive paint on the framework is adopted to replace the mode of manually coating semi-conductive crepe paper to perform electric field shielding on the framework, so that the same shielding effect is achieved, the use of manpower is reduced, the labor intensity is reduced, the working efficiency is improved, the production cost is reduced, and the production efficiency is improved. And the defect that the semi-conductive crepe paper is possibly swelled by manual wrapping is also avoided.

Description

Technical Field

[0001] The utility model relates to the field of manufacturing voltage transformer coils, and particularly relates to a voltage transformer skeleton for spraying semi-conductive paint during the winding of the primary winding of a voltage transformer. Background Art

[0002] Insulating materials need to be filled between the primary and secondary windings of a fully insulated voltage transformer to ensure sufficient insulation between the primary and secondary windings to meet relevant national standards and user requirements. Therefore, there must be a certain gap between the primary and secondary windings of the transformer. So the primary winding of a fully insulated voltage transformer needs to be wound on a cylindrical support skeleton. To ensure that the partial discharge index of the voltage transformer meets the standard requirements, the skeleton needs to be shielded. The usual method is to wrap a layer of semi-conductive crinkled paper around the skeleton. This method requires applying a layer of white glue on the skeleton and then sticking the semi-conductive crinkled paper, both of which need to be done manually, and there is also a possibility of bulging after drying. The work efficiency is relatively low. Summary of the Invention

[0003] An improvement made in view of at least one defect of the prior art, the utility model provides a voltage transformer skeleton sprayed with semi-conductive paint, which meets the requirements of electromagnetic shielding of the skeleton, solves the possible bulging problem of wrapping shielding paper, and greatly improves work efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solution: A voltage transformer skeleton sprayed with semi-conductive paint, the skeleton is a cylindrical shape surrounded by epoxy glass cloth, the two ends of the skeleton are processed into rounded corners, the inner and outer surfaces of the skeleton are sandblasted, and then a semi-conductive paint surface is sprayed. The sandblasted surface is roughened with 12-mesh sand, and the volume resistance of the semi-conductive paint surface is 5 kΩ - 15 kΩ / cm.

[0005] Preferably, the thickness of the semi-conductive paint surface is 20 μm - 25 μm.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: The utility model uses the method of spraying semi-conductive paint on the skeleton to replace the method of manually wrapping semi-conductive crinkled paper to shield the electric field of the skeleton. While achieving the same shielding effect, it reduces the use of labor, reduces labor intensity, improves work efficiency, reduces production costs, and also avoids the possible bulging defect of manually wrapping semi-conductive crinkled paper. Brief Description of the Drawings

[0007] Figure 1 It is a schematic structural diagram of the voltage transformer skeleton of the present utility model.

[0008] Markings in the figure: 1 - rounded corner, 2 - semi-conductive paint surface. Detailed Description of the Invention

[0009] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0010] In view of the deficiencies of the prior art, a voltage transformer skeleton for spraying semi-conductive paint in the present utility model has a cylindrical shape surrounded by epoxy glass cloth. The two ends of the skeleton are processed into inverted rounded corners 1. The first layer on the inner and outer surfaces of the skeleton is a sandblasted surface, and the second surface is a semi-conductive paint surface 2. As Figure 1 shown, this application proposes a voltage transformer skeleton, which is made into a cylindrical shape by winding epoxy glass cloth on a cylindrical mold and then cured. Then it is processed into the required size and shape according to requirements, and the edges of the skeleton are rounded. To ensure the adhesion of the sprayed semi-conductive paint, the skeleton is first sandblasted. The purpose is to have good adhesion for the semi-conductive paint to be sprayed. 12-mesh white jade sand is evenly sprayed on the inner and outer surfaces. In this way, both the adhesion of the sprayed semi-conductive paint can be ensured, and the surface of the skeleton has relatively good flatness and is not overly rough. After sandblasting, it is cleaned with anhydrous alcohol. After cleaning, the semi-conductive paint is sprayed on the skeleton. The volume resistance of the sprayed semi-conductive paint should be ensured to be between 5 kΩ and 15 kΩ / cm. Within this resistance value range, it can not only play a good role in electric field shielding, but also will not form a large circulating current under the action of the magnetic field, causing the temperature to rise, which is both applicable and safe and reliable. The thickness of the sprayed semi-conductive paint is between 20 μm and 25 μm, which can not only ensure the requirements of the above volume resistance value, but also will not form paint beans and paint flows. The sandblasting and spraying of the voltage transformer skeleton can be completed by a robot, which not only saves labor but also has high efficiency, and can effectively reduce production costs.

[0011] The present utility model uses the method of spraying semi-conductive paint on the skeleton to replace the method of manually covering semi-conductive crinkled paper to shield the electric field of the skeleton. While achieving the same shielding effect, it reduces the use of labor, reduces the labor intensity, improves the work efficiency, reduces the production cost, and also avoids the possible defect of bulging in manually wrapping semi-conductive crinkled paper.

[0012] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A voltage transformer skeleton sprayed with semi-conductive paint, characterized in that: The skeleton is a cylindrical shape surrounded by epoxy glass cloth. The two ends of the skeleton are processed into inverted rounded corners (1). The inner and outer surfaces of the skeleton are sandblasted and then sprayed with a semi-conductive paint surface (2). The sandblasting uses 12-mesh sand for surface roughening. The volume resistance of the semi-conductive paint surface (2) is 5 kΩ to 15 kΩ / cm.

2. The voltage transformer skeleton for spraying semi-conductive paint according to claim 1, characterized in that: The thickness of the semi-conductive paint surface (2) is 20 μm to 25 μm.

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