CN212210638U - Stator winding lead wire stick doubling insulation structure and generator - Google Patents
Stator winding lead wire stick doubling insulation structure and generator Download PDFInfo
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- CN212210638U CN212210638U CN202020737155.4U CN202020737155U CN212210638U CN 212210638 U CN212210638 U CN 212210638U CN 202020737155 U CN202020737155 U CN 202020737155U CN 212210638 U CN212210638 U CN 212210638U
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Abstract
The utility model provides a pair of stator winding lead wire stick doubling insulation system and generator, this generator adopt this stator winding lead wire stick doubling insulation system. The stator winding lead wire bar doubling insulation structure comprises a basic insulation layer, an insulation cover, an insulation cylinder and an outer insulation layer. The base insulating layer is arranged at the periphery of the parallel head area of the lead bar. The insulating cover is lapped with the basic insulating layer, is arranged at the end part of the lead bar and has a circular ring-shaped structure. The insulating cylinder overlaps the insulating cover and has a longer axial length than the insulating cover. The outer insulating layer is used for electrically sealing a gap generated by overlapping the insulating cover with the base insulating layer and/or the insulating cylinder. This stator winding lead wire stick doubling insulation structure can effectively strengthen insulation structure's electrical insulation intensity, prolongs the edge face electrical distance between two doubling insulation structures by a wide margin to avoid lead wire stick doubling regional flashover discharge and doubling insulation structure breakdown phenomenon's emergence.
Description
Technical Field
The utility model relates to a generator technical field especially relates to a stator winding lead wire stick doubling insulation system and generator.
Background
When the generator normally operates, a certain potential difference is generated between the parallel ends of the stator windings, and the maximum value of the potential difference can be the rated line voltage of the stator of the generator. The rated voltage of the large-scale generating set is higher, for example, the rated voltage of the nuclear generating set reaches 27kV level. In order to avoid the abnormal phenomena of damaging the safe operation of the unit, such as corona, electric corrosion, instant short circuit and the like generated between the parallel heads, the parallel heads of the stator windings of the generator need to be subjected to electric insulation treatment.
When a stator winding interphase voltage resistance test is carried out, because the space structure of a head combining area of the stator winding interphase lead wire bar is compact, the electrical distance of the head combining area is very limited, and the risk of insulation breakdown of the head combining area exists, the material cost and the labor cost are increased due to the rework caused by the space structure, and the normal production and manufacturing period of a product is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that above-mentioned exists, a stator winding lead wire stick doubling insulation system is provided, can effectively strengthen insulation system's electrical insulation intensity, prolong the face electrical distance between two doubling insulation systems by a wide margin to avoid lead wire stick and first regional flashover discharge and doubling insulation system breakdown phenomenon's emergence.
The utility model provides a pair of stator winding lead wire stick doubling insulation system, include:
the base insulating layer is arranged at the periphery of the lead bar parallel head area;
the insulating cover is lapped with the basic insulating layer, is arranged at the end part of the lead bar and has a circular structure;
an insulation tube overlapping the insulation cover and having a longer axial length than the insulation cover; and
and the outer-wrapping insulating layer is used for electrically sealing a gap generated by lapping the insulating cover with the base insulating layer and/or the insulating cylinder.
Furthermore, the base insulating layer is provided with an annular bulge part, the insulating cover covers the bulge part, and the insulating cylinder is sleeved in the insulating cover.
Further, the outer end face of the annular convex part is flush with or close to flush with the outer end face of the insulation cover, and the inner end face of the insulation cylinder is flush with or close to flush with the inner end face of the insulation cover.
Further, the space wrapped by the outer wrapping insulating layer is filled with an electric conformal material.
Further, the base insulating layer is an insulating box filled with insulating glue, or the base insulating layer comprises an inner layer and an outer layer, the inner layer is epoxy resin, and the outer layer is a mica tape.
Furthermore, the outer insulating layer comprises an inner layer and an outer layer, wherein the inner layer is made of epoxy resin, and the outer layer is made of mica tape.
Further, the epoxy resin is a room temperature curing epoxy resin.
Furthermore, the epoxy resin is coated, and the mica tape is manually coated.
On this basis, the utility model also provides an including above-mentioned stator winding lead wire stick parallel insulation system's generator.
Further, the generator is a nuclear power generator.
Through comprehensively adopting the technical scheme, the utility model discloses can gain following beneficial effect:
1. by adopting the lap joint mode of the insulating cylinder and the insulating cover, the surface electrical distance between the parallel insulation structures of the stator winding interphase lead wire bars can be greatly prolonged;
2. the outer surface of the overlapping area of the insulating cover and the base insulating layer and/or the insulating cylinder is filled and sealed by adopting an electrical conformal material, and then the outer surface of the overlapping area of the electrical conformal material and the base insulating layer and/or the insulating cylinder is coated with epoxy resin and wound with mica tapes, so that the electrical insulation strength of the parallel insulation structure of the stator winding interphase lead bar is further enhanced, and the phenomena of flashover discharge and parallel insulation breakdown of the parallel area of the stator winding interphase lead bar can be effectively avoided.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is an overall schematic diagram of a stator winding lead bar shunt insulation structure in some embodiments of the present invention.
Description of reference numerals:
1-lead wire bar, 2-base insulating layer, 3-insulating cover, 4-insulating cylinder, 5-outer insulating layer, 6-electric conformal material and 7-water cooling tube.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the drawings of the present invention, it should be understood that different technical features which are not mutually alternative are shown in the same drawing, and the embodiment described with reference to the drawings is not indicated or implied to include all the technical features in the drawings only for the convenience of simplifying the drawing description and reducing the number of drawings, and thus should not be understood as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In some embodiments, a stator winding lead bar 1 is shown in fig. 1, and a stator winding lead bar end-to-end insulation structure comprises a base insulation layer 2, wherein the base insulation layer 2 is arranged at the periphery of an end-to-end area of the lead bar 1. The provision of the base insulating layer 2 is an important measure for preventing the lead bar 1 from generating corona and discharge in the end-joining region. In some embodiments, the base insulating layer 2 is electrically insulated by pouring insulating glue into the insulating box. In other embodiments, the base insulating layer 2 is electrically insulated by coating mica tapes, filling mud or glass ribbons, and the like, and has the advantages of simple process and convenient operation. In one or more embodiments, the base insulating layer 2 includes an inner layer of room temperature cured epoxy and an outer layer of mica tape. In at least one embodiment, the epoxy is applied by brushing and the mica tape is wrapped by hand winding.
In some embodiments, the base insulation layer 2 is open for use in a generator provided with a water-cooled circulation system for the stator windings, such as a water-cooled tube 7. The stator winding lead wire bar parallel insulation structure also comprises an insulation cover 3 lapped with the base insulation layer 2. In some embodiments, an insulating cover 3 is provided at the end of the lead bar 1, having a ring-shaped configuration, and in at least one embodiment, the insulating cover 3 is used to electrically seal the gap between the water cooled tube 7 and the base insulating layer 2. The base insulating layer 2 and the insulating cover 3 are installed in a lap joint mode. In some embodiments, the base insulation layer 2 has an annular boss, and the insulation cover 3 is wrapped in the boss. In at least one embodiment, the outer end face of the annular boss is flush or nearly flush with the outer end face of the insulating cap 3.
The length of the insulating cover 3 is short and thus the electrical distance along the face is limited. To further extend the in-plane electrical distance, in some embodiments the stator winding lead bar end-to-end insulation structure further comprises an insulation can 4 overlapping the insulation cover 3, and the insulation can 4 has a longer axial length than the insulation cover 3. The insulating cover 3 and the insulating cylinder 4 are also installed in a lap joint mode. In some embodiments, the insulating cylinder 4 is sleeved inside the insulating cover 3. In at least one embodiment, the inner end surface of the insulation barrel 4 is flush or nearly flush with the inner end surface of the insulation cap 3.
In some embodiments, the insulation cover 3 has a gap at the overlap with the base insulation layer 2 and/or the insulation can 4, and the stator winding lead bar end-to-end insulation structure further comprises an outer insulation layer 5 for electrically sealing the gap. In one or more embodiments, the space surrounded by the outer insulating layer 5 is filled with an electrically compliant material 6 to further enhance the effect of electrically sealing the insulation. In at least one embodiment, the electrical conformable material 6 is made of electrical polyester conformable felt as a substrate, impregnated with an epoxy adhesive, and baked, and has good compressibility, moldability, and electrical insulation properties.
In some embodiments, the outer insulating layer 5, similar to the base insulating layer 2, includes an inner layer of room temperature curable epoxy resin and an outer layer of mica tape. In one or more embodiments, the epoxy is applied by brushing and the mica tape is wrapped by hand winding.
At least one exemplary embodiment is now provided in connection with the drawings, a detailed description of which is provided in the drawings not intended to limit the scope of the claimed invention, but is merely representative of exemplary embodiments provided in the invention.
Exemplary embodiment 1
As shown in figure 1, the parallel insulation structure of the stator winding lead wire bars comprises a base insulation layer 2, an insulation cover 3, an insulation cylinder 4 and an outer coating insulation layer 5. The base insulating layer 2 is provided on the periphery of the parallel head region of the lead bar 1. The insulating cover 6 is overlapped with the base insulating layer 5, is arranged at the end part of the lead bar 4 and has a circular ring-shaped structure. The insulating cylinder 4 overlaps the insulating cover 3 and has a longer axial length than the insulating cover 3. The outer insulating layer 5 serves to electrically seal a gap generated by overlapping the insulating cover 3 with the base insulating layer 2 and/or the insulating cylinder 4.
The base insulating layer 2 has an annular boss, the insulating cover 3 is covered in the annular boss, and the insulating cylinder 4 is sleeved in the insulating cover 3. The outer end face of the annular convex part is flush with or close to the outer end face of the insulating cover 3, and the inner end face of the insulating cylinder 4 is flush with or close to the inner end face of the insulating cover 3. The inner end face refers to one end facing the lead wire bar 1, the other end is an outer end face, for example, the inner end face of the insulation cylinder 4 is an end face of one end which is electrically sealed, and the outer end face of the insulation cylinder 4 is an end face of one end which is not electrically sealed. The base insulating layer 2 and the outer insulating layer 5 both comprise an inner layer and an outer layer, wherein the inner layer is room temperature curing epoxy resin, and the outer layer is a mica tape. The space wrapped by the outer insulating layer 5 is filled with an electric conformal material 6.
The epoxy resin is coated, and the mica tape is manually coated.
The working principle is that the electric conformal material 6 is adopted to fill and seal the outer surfaces of the overlapping areas of the insulating cover 3, the base insulating layer 2 and the insulating cylinder 4, and then the epoxy resin and the winding mica tape are coated on the outer surfaces of the overlapping areas of the electric conformal material 6, the base insulating layer 2 and the insulating cylinder 4 in a brush coating mode, so that the electric insulation strength of the parallel insulation structure of the stator winding interphase lead bar is further enhanced, and the phenomena of flashover discharge and parallel insulation breakdown of the parallel area of the stator winding interphase lead bar can be effectively avoided.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. A stator winding lead wire bar doubling insulation structure is characterized by comprising:
the base insulating layer is arranged at the periphery of the lead bar parallel head area;
the insulating cover is lapped with the basic insulating layer, is arranged at the end part of the lead bar and has a circular structure;
an insulation tube overlapping the insulation cover and having a longer axial length than the insulation cover; and
and the outer-wrapping insulating layer is used for electrically sealing a gap generated by lapping the insulating cover with the base insulating layer and/or the insulating cylinder.
2. A stator winding lead bar shunt end insulation structure as recited in claim 1, wherein: the basic insulating layer is provided with an annular bulge, the insulating cover covers the bulge, and the insulating cylinder is sleeved in the insulating cover.
3. A stator winding lead bar shunt end insulation structure as recited in claim 2, wherein: the outer end face of the annular protruding portion is flush with or close to the outer end face of the insulating cover, and the inner end face of the insulating cylinder is flush with or close to the inner end face of the insulating cover.
4. A stator winding lead bar shunt end insulation structure according to any one of claims 1 to 3, wherein: the space wrapped by the outer insulating layer is filled with an electric conformal material.
5. A stator winding lead bar shunt end insulation structure according to any one of claims 1 to 3, wherein: the basic insulating layer is an insulating box filled with insulating glue.
6. A stator winding lead bar shunt end insulation structure according to any one of claims 1 to 3, wherein: the base insulating layer and the outer insulating layer both comprise an inner layer and an outer layer, the inner layer is made of epoxy resin, and the outer layer is made of mica tape.
7. A stator winding lead bar shunt end insulation structure as recited in claim 6, wherein: the epoxy resin is room temperature curing epoxy resin.
8. A stator winding lead bar shunt end insulation structure as recited in claim 6, wherein: the epoxy resin is coated, and the mica tape is manually coated.
9. An electrical generator, characterized by: comprising a stator winding lead bar end-to-end insulation structure as claimed in any one of claims 1 to 7.
10. The generator of claim 9, wherein: the generator is a nuclear power generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020737155.4U CN212210638U (en) | 2020-05-07 | 2020-05-07 | Stator winding lead wire stick doubling insulation structure and generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020737155.4U CN212210638U (en) | 2020-05-07 | 2020-05-07 | Stator winding lead wire stick doubling insulation structure and generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212210638U true CN212210638U (en) | 2020-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020737155.4U Active CN212210638U (en) | 2020-05-07 | 2020-05-07 | Stator winding lead wire stick doubling insulation structure and generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212210638U (en) |
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2020
- 2020-05-07 CN CN202020737155.4U patent/CN212210638U/en active Active
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