CN203631281U - Main insulation device for oil immersed transformer mixed insulation - Google Patents

Abstract

The utility model relates to a main insulation device for hybrid insulation of an oil-immersed transformer, which relates to the technical field of transformers. High-voltage level, large-capacity transformers have poor heat dissipation and are prone to aging. In order to improve the heat dissipation effect, it is necessary to increase the volume, increase the inconvenience of transportation and installation, and the cost is high. The utility model includes a frame body, an iron core column arranged on the frame body, a low-voltage winding and a high-voltage winding outer jacketed on the iron core column. Fibrous insulation is provided between the winding and the high-voltage winding; the low-voltage winding and the high-voltage winding are divided into multiple sections in the axial direction, and the sections are separated by the first width pad, and the two ends of the winding are provided with a second width. spacer. The technical scheme improves the average temperature of the transformer winding and the hot spot temperature of the winding, reduces the aging rate of the insulating material of the transformer, improves the insulation strength of the transformer, reduces the volume and weight of the transformer, and is convenient for transportation and installation.

Description

A Main Insulation Device for Hybrid Insulation of Oil-immersed Transformer

technical field

The invention relates to a main insulation device for hybrid insulation of an oil-immersed transformer, belonging to the technical field of transformers.

Background technique

At present, domestic oil-immersed transformer insulation mainly adopts insulating cardboard and insulating oil structure. This structure dominates the transformer insulation structure. For high-voltage level and large-capacity transformers, their heat dissipation is poor and they are prone to aging. In order to improve the heat dissipation effect, it is necessary to increase the volume, increase the inconvenience of transportation and installation, and the cost is high.

Contents of the invention

The technical problem to be solved and the technical task proposed by the present invention are to perfect and improve the existing technical solutions, to provide a main insulation device for hybrid insulation of oil-immersed transformers, and to achieve the purpose of solving the high temperature rise and high aging rate of transformers. For this reason, the present invention takes the following technical solutions.

The oil-immersed transformer includes a frame body, an iron core column arranged on the frame body, a low-voltage winding and a high-voltage winding outer jacketed on the iron core column, and is characterized in that: in the main insulation device, there is a Fibrous insulation is provided between the winding and the high-voltage winding; the low-voltage winding and the high-voltage winding are divided into multiple sections in the axial direction, and the sections are separated by the first width pad, and the two ends of the winding are provided with a second width. spacer. The first radial spacer separates and tightens the winding segments and plays a role in heat dissipation; the second radial spacer is provided at both ends of the winding to pad the two ends tightly to ensure the heat dissipation and protection effect of the winding end.

As a further improvement and supplement to the above scheme, the present invention also includes the following additional technical features:

The inner and outer sides of the low-voltage winding and the inner and outer sides of the high-voltage winding are provided with first axial struts, and the low-voltage winding and high-voltage winding are wound on the first axial struts by wires.

Inside the low-voltage windings and high-voltage windings, every few winding sections, an oil baffle is set at the position of the pad in the first direction. One end of the oil baffle is an extended end, and the extended end is downward The bending is inclined, and the adjacent oil baffles are misplaced, which can change the direction of oil flow inside the winding and speed up the oil flow.

In the middle of the high-voltage winding, there is a second axial strut used to form the internal cooling oil channel of the winding, which divides the winding into two parts in the widthwise direction of the winding, so that the internal temperature of the winding is within a controllable range.

The first radial spacer, the first axial stay, the second radial spacer, the second axial stay and the wires are all made of high-temperature insulating materials to ensure that the transformer is not easily aged in a high-temperature environment during operation. Extend the service life of the transformer.

The invention can achieve the following beneficial effects: the oil-immersed transformer can increase the average temperature of the transformer winding and the hot spot temperature of the winding by using the hybrid insulation device, reduce the aging rate of the transformer insulating material, improve the insulation strength of the transformer, and reduce the temperature of the transformer. Small size and weight, easy to transport and install.

Description of drawings

Fig. 1 is a schematic diagram of the assembly of the transformer body of the present invention.

Fig. 2 is a schematic diagram of the hybrid insulation structure of the transformer of the present invention.

Fig. 3 is a schematic diagram of transformer insulating oil guiding in the present invention.

1. Iron core column; 2. Low voltage winding; 3. High voltage winding; 4. Fibrous insulation; 5. The first width pad; 6. The first axial stay; 7. The second width pad; 8 , the second axial stay; 9, the wire; 10, the oil baffle.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1-3, the technical solution of the present invention is: the hybrid insulation device of the oil-immersed transformer is mainly composed of iron core column 1, low-voltage winding 2, high-voltage winding 3, and fiber insulation 4. Winding manufacturing process: the winding is wound on the first axial stay 6 with a wire 9, and the first width spacer 5 is placed between the winding segments to separate and tighten the winding segments and play a role in heat dissipation; in the winding Inside, every few line segments, an oil baffle 10 is set at the position of the pad 5 in the first direction, which can make the transformer oil inside the transformer winding flow in a certain direction, change the direction of oil flow inside the winding, and play a guiding role. Increase oil flow rate. After the winding is completed, the second radial pads 7 are placed at both ends of the winding to ensure the heat dissipation and protection effect of the winding end. In the design process, if the winding width is too large, the second axial support 8 of the cooling oil passage inside the winding can be added in the middle of the winding, and the winding is divided into two parts in the winding width direction, so that the internal temperature of the winding can reach a controllable range. Inside. A forced oil circulation device is used outside the transformer to speed up the oil flow, thereby reducing the hot spot temperature of the winding.

Conductors 9 between high and low voltage windings 2 and 3, the first radial spacer 5 inside the winding, the first axial support 6, the second radial spacer 7 at the end of the winding, the second axial direction of the cooling oil channel inside the winding The stays 8 all adopt high-temperature insulating materials. The rest of the insulation uses conventional fiber insulation materials and transformer insulating oil.

High-temperature insulating materials are used in the higher-temperature areas of transformer windings, that is, all parts in contact with heating wires are insulated with high-temperature materials, while the lower-temperature areas use conventional fibrous insulating materials.

Body assembly process: when assembling, first put the low-voltage winding 2 into the assembly frame body; wrap a certain amount of fiber insulation 4 on the outside of the low-voltage winding 2, put it into the high-voltage winding 3, and then use the fiber insulation 4 to complete the whole process. The transformer body suit, the high and low voltage windings and the body insulation form an overall hybrid insulator body structure. A certain amount of fiber insulation 4 is wrapped around the outside of the iron core column 1, and then the above-mentioned body structure with hybrid insulation is directly placed on the iron core column 1, and after being tightly compacted, the transformer hybrid insulator body set is completed. process.

The main insulation structure of the hybrid insulation of oil-immersed transformers shown in Figures 1-3 above is a specific embodiment of the present invention, which has already reflected the substantive features and progress of the present invention, and can be based on the actual use needs, based on the inspiration of the present invention Under this circumstance, the equivalent modification of its structure and other aspects are all within the scope of protection of this plan.

Claims (5)

1. A main insulation device for mixed insulation of an oil-immersed transformer. The oil-immersed transformer includes a frame body, an iron core column (1) installed on the frame body, a low-voltage winding (2) sheathed on the iron core column (1), a high-voltage The winding (3) is characterized in that fiber insulation is provided between the iron core column (1) and the low-voltage winding (2) and between the low-voltage winding (2) and the high-voltage winding (3) in the main insulation device. (4); the low-voltage winding (2) and the high-voltage winding (3) are divided into multiple sections in the axial direction, and the sections are separated by the first width pad (5), and the two ends of the winding are provided with a second width direction. Block (7). 2. The main insulating device according to claim 1, characterized in that first axial struts (6 ), the low-voltage winding (2) and the high-voltage winding (3) are wound on the first axial strut (6) through wires (9). 3. The main insulating device according to claim 2, characterized in that: inside the low-voltage winding (2) and the high-voltage winding (3), every few winding sections are at the position of the first radial spacer (5) An oil baffle (10) is provided, one end of the oil baffle (10) is an overhanging end, the overhanging end is bent downward and inclined, and adjacent oil baffles (10) are arranged in a misplaced manner. 4. The main insulation device according to any one of claims 1-3, characterized in that: a second axial strut (8) for forming the internal cooling oil passage of the winding is arranged in the middle of the high voltage winding (3), The winding width direction divides the winding into two parts. 5. The main insulating device according to claim 4, characterized in that: the first radial spacer (5), the first axial strut (6), the second radial spacer (7), Both the second axial strut (8) and the wire (9) are made of high-temperature insulating material.

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