CN216436918U - Novel main insulation composite structure of generator stator bar - Google Patents
Novel main insulation composite structure of generator stator bar Download PDFInfo
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- CN216436918U CN216436918U CN202122763901.4U CN202122763901U CN216436918U CN 216436918 U CN216436918 U CN 216436918U CN 202122763901 U CN202122763901 U CN 202122763901U CN 216436918 U CN216436918 U CN 216436918U
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Abstract
The utility model belongs to the technical field of the stator bar, concretely relates to novel generator stator bar owner insulation composite construction. The technical scheme is as follows: a novel main insulation composite structure of a generator stator bar comprises an inner main insulation layer wound on a bar wire and an outer main insulation layer wound on the inner main insulation layer; the inner main insulating layer is a wrapped multi-glue mica tape, the content of mica paper in the multi-glue mica tape is 40% -50%, and the content of an inorganic reinforcing material in the multi-glue mica tape is 17% -22%; the outer main insulating layer is a wrapped mica tape with less glue, the content of mica paper in the mica tape with less glue is 70% -80%, and the content of inorganic reinforcing materials in the mica tape with less glue is 11% -13%. The utility model provides a but guarantee under the prerequisite of stator bar main insulation mechanical properties and electrical property the main insulation thickness's of many glue main insulation system bars of attenuate novel generator stator bar main insulation composite construction.
Description
Technical Field
The utility model belongs to the technical field of the stator bar, concretely relates to novel generator stator bar owner insulation composite construction.
Background
The stator bar is one of the core components of the generator set, and the electrical performance and the mechanical performance of the main insulation of the stator bar play an important role in safe and reliable operation of the generator set. The main insulation of the stator bar mainly comprises two insulation systems, one is an insulation system formed by overlapping a small-amount mica powder tape on the surface of a lead and hot-pressing curing after vacuum pressure impregnation by epoxy resin (a small-amount VPI insulation system is called as follows); the other is an insulation system (a multi-glue insulation system for short, the same below) formed by overlapping and wrapping a multi-glue mica tape on the surface of the lead and directly performing hot-pressing curing.
The main insulation of the stator bar adopts a little-powder mica tape or a much-powder mica tape which mainly comprises mica paper, an adhesive and an inorganic reinforcing material. The main insulation electrical performance of the winding bar is mainly determined by the content of mica paper in the mica tape, the content of the mica paper in the less-glue-powder mica tape is 70-80%, the content of the mica paper in the rich-glue-powder mica tape is 40-50%, and the electrical performance of the less-glue-powder mica tape is superior to that of the rich-glue-powder mica tape; the mechanical performance of the main insulation of the wire rod is related to the inorganic reinforcing material in the mica tape, the content of the inorganic reinforcing material in the multi-glue powder mica tape is 17% -22%, the content of the inorganic reinforcing material in the low-glue powder mica tape is 11% -13%, the typical value of the VPI main insulation impact strength of low glue is 40 kJ/square meter, and the typical value of the VPI main insulation impact strength of high glue is 50 kJ/square meter.
With the continuous improvement of rated voltage grade of the generator set, the length of the bar and the thickness of the main insulation are correspondingly increased, and the increase of the length of the bar needs to further consider the mechanical strength of the main insulation of the bar. In order to ensure the main insulation electrical performance of the winding bar, the main insulation thickness increased by the multi-glue main insulation system is more than that of the less-glue VPI insulation system, the winding bar hot press molding process difficulty of the multi-glue main insulation system is higher, the probability of defects in the main insulation is relatively increased, and the excessive increase of the main insulation thickness is not beneficial to heat dissipation of a generator set.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model aims to provide a but under the prerequisite of assurance stator bar main insulation mechanical properties and electrical property the main insulation thickness's of many glue main insulation system bars novel generator stator bar main insulation composite construction of attenuate.
The utility model discloses the technical scheme who adopts does:
a novel main insulation composite structure of a generator stator bar comprises an inner main insulation layer wound on a bar lead and an outer main insulation layer wound on the inner main insulation layer; the inner main insulating layer is a wrapped multi-glue mica tape, the content of mica paper in the multi-glue mica tape is 40% -50%, and the content of an inorganic reinforcing material in the multi-glue mica tape is 17% -22%; the outer main insulating layer is a wrapped mica tape with less glue, the content of mica paper in the mica tape with less glue is 70% -80%, and the content of inorganic reinforcing materials in the mica tape with less glue is 11% -13%.
Compare with the line stick of single main insulation system, the utility model discloses a novel compound main insulation structure of stator bar has synthesized the little two big advantages of gluing VPI insulation system and gluing the insulation system more, under the prerequisite of guaranteeing stator bar main insulation mechanical properties and electrical property, both can the main insulation thickness of the many gluey main insulation system line sticks of attenuate, can improve the mechanical strength of little gluey VPI main insulation system line stick again to guarantee the safety and stability operation of generating set.
The electrical aging life of the stator bar produced by adopting the novel composite main insulation structure is improved by 30% compared with that of a bar of a multi-glue insulation system under 2.0Un, and is improved by 50% compared with that of the bar of the multi-glue insulation system under 3.0 Un; compared with a wire rod of a less-glue VPI insulation system, the 2.0Un electrical aging life after 500 times of cold-heat cycle tests is improved by 40%.
As the preferred scheme of the utility model, the thickness ratio scope of inlayer main insulation layer's thickness and outer main insulation layer is 0.15 ~ 0.18. The utility model discloses a main insulation thickness of many glues main insulation system line stick obviously reduces.
As the preferred scheme of the utility model, the thickness of many glue mica tape is 0.14 mm.
As the preferred scheme of the utility model, the thickness of few gluey mica tape is 0.15 mm.
As the utility model discloses an optimal scheme, inlayer main insulation layer and outer main insulation layer all adopt the mode of overlapping the package to carry out around the package.
As a preferred embodiment of the present invention, the inner main insulating layer and the outer main insulating layer are impregnated with epoxy resin. After the inner layer main insulating layer and the outer layer main insulating layer are wrapped on the wire rod conducting wire in an overlapped mode, the epoxy resin is soaked into the inner layer main insulating layer and the outer layer main insulating layer of the wire rod through a vacuum pressure soaking system, heating and pressurizing curing forming is conducted in a die, and after the temperature of the wire rod reaches 150 +/-5 ℃, heat is preserved for 10 hours.
The utility model has the advantages that:
compare with the line stick of single main insulation system, the utility model discloses a novel compound main insulation structure of stator line stick has synthesized the two big advantages of few gluey VPI insulation system and the insulating system of gluing more, under the prerequisite of guaranteeing stator line stick main insulation mechanical properties and electrical property, both can the attenuate main insulation thickness who glues the main insulation system line stick more, can improve the mechanical strength of few gluey VPI main insulation system line stick again to guarantee the safety and stability operation of generating set.
The electrical aging life of the stator bar produced by adopting the novel composite main insulation structure is improved by 30% under 2.0Un compared with the bar of a multi-glue insulation system, and is improved by 50% under 3.0Un compared with the bar of the multi-glue insulation system; compared with a wire rod of a less-glue VPI insulation system, the 2.0Un electrical aging life after 500 times of cold-heat cycle tests is improved by 40%.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1-bar wire; 2-an inner main insulating layer; 3-outer main insulating layer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
As shown in figure 1, the novel main insulation composite structure of the generator stator bar of the embodiment is composed of an inner main insulation layer 2 and an outer main insulation layer 3. The inner main insulating layer 2 adopts a glue-rich mica tape with the thickness of 0.14mm, the content of mica paper is 40-50%, and the content of inorganic reinforcing material is 17-22%. The outer main insulating layer 3 adopts a mica tape with a thickness of 0.15mm and less glue, the content of mica paper is 70-80%, and the content of inorganic reinforcing material is 11-13%.
The inner layer main insulating layer 2 and the outer layer main insulating layer 3 are wrapped in a lap-wrapping mode. The ratio of the thickness of the inner main insulating layer 2 to the thickness of the outer main insulating layer 3 is 0.15-0.18.
After the inner main insulating layer 2 and the outer main insulating layer 3 which are overlapped on the wire rod lead 1 are finished, epoxy resin is immersed into the inner main insulating layer 2 and the outer main insulating layer 3 of the wire rod by adopting a vacuum pressure impregnation system, heating and pressurizing are carried out in a mould for solidification and forming, and the heat of the wire rod is preserved for 10 hours after the temperature of the wire rod reaches 150 +/-5 ℃.
Compare with the line stick of single main insulation system, the utility model discloses a novel compound main insulation structure of stator bar has synthesized the little two big advantages of gluing VPI insulation system and gluing the insulation system more, under the prerequisite of guaranteeing stator bar main insulation mechanical properties and electrical property, both can the main insulation thickness of the many gluey main insulation system line sticks of attenuate, can improve the mechanical strength of little gluey VPI main insulation system line stick again to guarantee the safety and stability operation of generating set.
The electrical aging life of the stator bar produced by adopting the novel composite main insulation structure is improved by 30% compared with that of a bar of a multi-glue insulation system under 2.0Un, and is improved by 50% compared with that of the bar of the multi-glue insulation system under 3.0 Un; compared with a wire rod of a less-glue VPI insulation system, the 2.0Un electrical aging life after 500 times of cold-heat cycle tests is improved by 40%.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (6)
1. A novel main insulation composite structure of a generator stator bar is characterized by comprising an inner main insulation layer (2) wound on a bar wire (1) and an outer main insulation layer (3) wound on the inner main insulation layer (2); the inner main insulating layer (2) is a wrapped multi-glue mica tape, the content of mica paper in the multi-glue mica tape is 40% -50%, and the content of inorganic reinforcing materials in the multi-glue mica tape is 17% -22%; the outer main insulating layer (3) is a wrapped mica tape with less glue, the content of mica paper in the mica tape with less glue is 70% -80%, and the content of inorganic reinforcing materials in the mica tape with less glue is 11% -13%.
2. The novel main insulation composite structure of the generator stator bar is characterized in that the ratio of the thickness of the inner main insulation layer (2) to the thickness of the outer main insulation layer (3) ranges from 0.15 to 0.18.
3. The novel generator stator bar main insulation composite structure as claimed in claim 1, wherein the thickness of the mica tape is 0.14 mm.
4. The novel generator stator bar main insulation composite structure as claimed in claim 1, wherein the thickness of the mica tape with less glue is 0.15 mm.
5. The novel generator stator bar main insulation composite structure is characterized in that the inner main insulation layer (2) and the outer main insulation layer (3) are wrapped in an overlapping mode.
6. A novel generator stator bar main insulation composite structure as claimed in claim 1, characterized in that said inner and outer main insulation layers (3) are impregnated with epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122763901.4U CN216436918U (en) | 2021-11-11 | 2021-11-11 | Novel main insulation composite structure of generator stator bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122763901.4U CN216436918U (en) | 2021-11-11 | 2021-11-11 | Novel main insulation composite structure of generator stator bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216436918U true CN216436918U (en) | 2022-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122763901.4U Active CN216436918U (en) | 2021-11-11 | 2021-11-11 | Novel main insulation composite structure of generator stator bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216436918U (en) |
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2021
- 2021-11-11 CN CN202122763901.4U patent/CN216436918U/en active Active
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