End ring of transformer coil
By replacing the electrical paperboard pressure plate with a glass fiber pultruded end ring, the problem of insufficient mechanical strength of transformer coils was solved, achieving lightweighting and cost reduction of the transformer.
Patent Information
- Application Number
- CN202420733860.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-04-10
AI Technical Summary
When the existing transformer coil experiences a short-circuit fault, the use of electrical cardboard pressure plates results in insufficient mechanical strength, leading to large and heavy pressure plates that increase the height and volume of the transformer.
The end rings are formed by cutting glass fiber pultruded tubes impregnated with epoxy resin, with an electrical strength of over 15kV/mm, replacing the traditional electrical paperboard pressure plate.
It improves the mechanical strength and short-circuit resistance of the pressure plate, reduces the thickness of the pressure plate, lowers the height of the transformer core and tank, shortens the production cycle, and reduces the cost of the transformer.
Smart Images
Figure CN223598520U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of end annular rings of transformer coil. BACKGROUND
[0002] When transformer is in short-circuit fault, it will generate huge electric force to both ends, so it needs to use two large compression rings at both ends to tightly press the coil. The two compression plates must be insulating materials with good electrical properties. In the past, they were glued on electrical paper board and then compacted, which are called electrical laminated paper board. Since the strength of electrical paper board is not high, in order to meet the requirements of mechanical strength, only the thickness can be increased. The diameter of the compression plate used in 500kV transformer coil is more than 3 meters, and its thickness has exceeded 100mm. Therefore, the volume of the compression plate is large, and its weight is also large, which especially increases the height of the coil, resulting in the forced increase of the height of the transformer and the bulkiness of the transformer. SUMMARY
[0003] The utility model discloses a kind of end annular rings of transformer coil.
[0004] The technical scheme used in the utility model has:
[0005] A kind of end annular rings of transformer coil, the annular ring is formed by pipe cutting, and the pipe is formed by glass fiber extrusion molding by impregnating epoxy resin.
[0006] Further, the electrical strength of the annular ring is above 15kV / mm.
[0007] The utility model has the following beneficial effects:
[0008] The mechanical strength is higher under the condition of the same thickness, so the thickness of the compression plate can be greatly reduced, thereby the height of the transformer core can be reduced, and the height of the transformer oil tank can be further reduced, and the amount of transformer oil can be reduced, which plays an obvious role in reducing the cost of transformer. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 Part of the utility model structure is shown in the drawings. DETAILED DESCRIPTION
[0010] The utility model will be further described below in combination with the drawings.
[0011] As Figure 1As shown, the end ring of the transformer coil, the plate produced by the pultrusion process of glass fiber, the special cutting equipment is used to process into a ring to act as a pressing plate, the width of the plate can reach more than 3 meters, and the thickness can reach 12 millimeters or even higher, the surface of the plate is roughened during pultrusion, so the plate can be directly coated with structural adhesive after cutting, cleaning and drying processes to produce the required thickness under high temperature and high pressure.
[0012] The ring pressing plate made in this way has higher mechanical strength under the condition of the same thickness, so the thickness of the pressing plate can be greatly reduced, thereby the height of the transformer core can be reduced, and the height of the transformer oil tank can be further reduced, and the amount of transformer oil can be reduced, which plays an obvious role in reducing the cost of the transformer. In addition, due to the improvement of the mechanical strength of the pressing plate produced by the utility model, the rigidity of the pressing plate is better, and the transformer has higher short-circuit resistance, and the utility model will be a revolutionary breakthrough in the insulation materials of the transformer.
[0013] The traditional electrical paper board pressing plate needs to be fully immersed in oil to meet the electrical performance requirements, which requires many holes or grooves on the surface, so the mechanical properties are difficult to guarantee, and the time required to meet the full infiltration will greatly prolong the production cycle of the transformer. The dielectric strength of the pressing plate produced by the utility model is more than 15kV / mm, which exceeds the insulation requirement of 10kV / mm required by the transformer, so it is not necessary to immerse in oil, which greatly shortens the production cycle of the transformer.
[0014] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary technical personnel in the technical field, some improvements can be made without departing from the principle of the utility model, and these improvements should also be regarded as the protection range of the utility model.
Claims
1. An end ring for a transformer coil, characterized by: The circular ring is formed by cutting a tube, which is made of glass fiber impregnated with epoxy resin.
2. The end ring of a transformer coil according to claim 1, characterized in that: The circular ring has an electrical strength of 15 kV / mm or more.